Water heater tank retrofit

Abstract

A replaceable electrical heating assembly is supplied for heating a fluid in a tank. A. replaceable electrical heating assembly may comprise a means for replacing a heating element of the tank while retaining water in the tank. The replaceable electrical heating assembly may include a radiation heating element, a sleeve enclosing the heating elements and / or a base. The replaceable electrical heating assembly may also include a temperature control element.

Description

[0001]APPLICATION FOR PATENT Title: Water heater tank retrofit RELATED APPLICATION / S This application claims the benefit of priority under 35 USC §119(e) of U.S. Provisional Patent Application No.63 / 442,777 filed 2 Feb.2023, the contents of which are incorporated herein by reference in their entirety. FIELDAND BACKGROUND OF THE INVENTION The present invention, in some embodiments thereof, relates to a replaceable electrical heating assembly for a water heater tank and more particularly, but not exclusively, to a method of retrofitting a water heater tank with a replaceable electrical heating assembly. SUMMARY OF THE INVENTION According to an aspect of some embodiments of the invention, there is provided a system for heating fluid in tank, the tank including an opening in the tank, the system including: a base configured to seal to the opening in the tank with a distal side of the base facing the inside of the tank and a proximal side of the base facing out of the tank; an opening in the base providing communication between the distal side and the proximal side; a sleeve projecting distally from the base, the sleeve having a hollow inside and a proximal opening to the hollow inside; where the proximal opening aligned to and is sealed to the opening in the base and the sleeve is sealed from fluid entering the hollow distal to the proximal opening, a heating element reversibly fitting through the proximal opening into the hollow inside of the sleeve. According to some embodiments of the invention, the fluid is water. According to some embodiments of the invention, the hole in the tank is configured for installation of a resistance heater. According to some embodiments of the invention, the heating element includes a lamp. According to some embodiments of the invention, the system further includes: an electrical connection for powering the heating element, the electrical connection accessible through the proximal opening. According to some embodiments of the invention, the system includes mechanical sealed connections for connection to the tank, and electrical connections to supply power to the heating element. According to some embodiments of the invention, the heating element includes a radiation heating element. According to some embodiments of the invention, the radiation heating element includes a halogen bulb. According to some embodiments of the invention, the radiation heating element includes an infra-red heating bulb. According to some embodiments of the invention, the radiation heating element includes a short wave heating element. According to some embodiments of the invention, the radiation heating element includes a medium wave heating element. According to an aspect of some embodiments of the invention, the heating element includes a U-shaped bulb. According to an aspect of some embodiments of the invention, the heating element includes a I-shaped heating element. According to some embodiments of the invention, the system further includes: a second sleeve projecting distally from the base, the second sleeve having a second hollow inside and a second proximal opening to the second hollow inside; wherein the second proximal opening is aligned to another opening in the base wherein second sleeve is sealed to the second opening in the base and the second sleeve is sealed distal to the second proximal opening, a thermometer fitting into the second hollow inside of the second sleeve with an electrical connection reporting a temperature of the fluid inside the tank. According to some embodiments of the invention, the system further includes: a thermometer projecting distally from the base with an electrical connection accessible from a proximal side of the base for reporting a temperature of the fluid inside the tank. According to some embodiments of the invention, the sleeve is made of metal. According to some embodiments of the invention, the sleeve is made of at least one of copper, Aluminum and steel. According to some embodiments of the invention, the base includes a flange on a proximal portion of the sleeve. According to some embodiments of the invention, the flange includes a bolt hole for securing the flange to a wall of the tank. According to some embodiments of the invention, the base includes a threaded portion configured to couple to threading of the opening of the tank. According to some embodiments of the invention, the sleeve is cylindrical. According to some embodiments of the invention, the sleeve is straight. According to an aspect of some embodiments of the invention, there is provided a method for replacing an electrical heating element for a tank, including: Inserting a distal portion of a sleeve into a hole for a resistance heating element in a side of the tank, an external surface of the sleeve inside the tank and an internal surface of the sleeve being sealed from the inside of the tank and having a proximal opening outside the tank: Connecting a sleeve with a seal to the tank fill tank with fluid; inserting a radiation heating element into the inside of the sleeve while the tank is at least partially full of fluid. According to some embodiments of the invention, the method further includes: connecting the radiation heating element to the sleeve. According to some embodiments of the invention, the method further includes: connecting the radiation heating element to an electrical power source. According to some embodiments of the invention, the method further includes: removing a previous radiation heating element from inside of the sleeve while the tank is at least partially full of fluid before the inserting the radiation heating element from inside of the sleeve. According to some embodiments of the invention, the method further includes: removing a resistance heating element from the hole for a resistance heating element prior to the step of inserting a distal portion of a sleeve into a hole for a resistance heating element. Implementation of the method and / or system of embodiments of the invention can involve performing or completing selected tasks manually, automatically, or a combination thereof. Moreover, according to actual instrumentation and equipment of embodiments of the method and / or system of the invention, several selected tasks could be implemented by hardware, by software or by firmware or by a combination thereof using an operating system. For example, hardware for performing selected tasks according to embodiments of the invention could be implemented as a chip or a circuit. As software, selected tasks according to embodiments of the invention could be implemented as a plurality of software instructions being executed by a computer using any suitable operating system. In an exemplary embodiment of the invention, one or more tasks according to exemplary embodiments of method and / or system as described herein are performed by a data processor, such as a computing platform for executing a plurality of instructions. Optionally, the data processor includes a volatile memory for storing instructions and / or data and / or a non-volatile storage, for example, a magnetic hard- disk and / or removable media, for storing instructions and / or data. Optionally, a network connection is provided as well. A display and / or a user input device such as a keyboard or mouse are optionally provided as well. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) Some embodiments of the invention are herein described, by way of example only, with reference to the accompanying drawings and images. With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of embodiments of the invention. In this regard, the description taken with the drawings makes apparent to those skilled in the art how embodiments of the invention may be practiced. In the drawings: FIG. 1 is a perspective view of a prior art resistive water heating assembly; FIG. 2A is a schematic diagram of a replaceable heating element fluid heater, in accordance with an embodiment of the current invention; FIG. 2B is a schematic diagram of a fluid heater with the sleeve removed (and shown beside the tank) revealing a lamp, in accordance with an embodiment of the current invention; FIG. 2C is a schematic diagram of system for a replaceable electrical heating assembly for a fluid heater including an opening for a thermocouple, in accordance with an embodiment of the current invention; FIG. 2D is a schematic illustration of a replaceable heating element installed in a fluid heater, in accordance with an embodiment of the current invention; FIG. 3A is a schematic drawing of a replaceable water heating assembly for a water heater tank, in accordance with an embodiment of the current invention; FIG.3B is a schematic drawing of a replaceable water heating assembly with a thermostat for a water heater tank, in accordance with an embodiment of the current invention; FIG. 4A is a schematic drawing of a replaceable water heating assembly for a water heater tank, in accordance with an embodiment of the current invention; FIG. 4B is a schematic drawing of a replaceable water heating assembly for a water heater tank, in accordance with an embodiment of the current invention; FIG. 5 is a flow chart illustration of a method for retrofitting a tank with a replaceable electrical heating assembly, in accordance with an embodiment of the current invention; FIG 6 is a block diagram of a water heating system in accordance with an embodiment of the current invention; FIG 7 is a block diagram of a kit for retrofitting water heating system in accordance with an embodiment of the current invention; FIG. 8A, 8B are an images of a flange type replacement heating element for a water tank in accordance with an embodiment of the current invention; FIG. 9 is an image threaded connector type of a replacement heating element for a water tank in accordance with an embodiment of the current invention; FIG 10 is a block diagram of a water heating system in accordance with an embodiment of the current invention; and FIG. 11 is a flow chart illustration of a method for retrofitting a tank with a replaceable electrical heating assembly, in accordance with an embodiment of the current invention. DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION Overview The present invention, in some embodiments thereof, relates to a replaceable electrical heating assembly for a fluid heater tank and more particularly, but not exclusively, to a method of retrofitting a water heater tank with a replaceable electrical heating assembly. As is known in the art, electrical water heaters use an assembly comprising resistance elements to directly transfer heat to water stored in a water storage tank, referred to herein as the tank. The resistive element may be located within the tank, near the bottom of the tank, and / or may be mechanically connected to the tank in a manner that prevents water in the tank from escaping. When the tank is filled with water and / or the power is supplied to the resistive heating element, the water in the tank is heated. When the resistive heating assembly malfunctions, it must be replaced. However, removing the resistive heating assembly allows the water in the storage tank to flow out of the tank, significantly complicating the process of replacing the resistive electrical heating assembly. An aspect of some embodiments of the current invention relates to a replaceable electrical heating assembly for a water heater. Optionally, a replaceable electrical heating assembly comprises a means for replacing a heating element of the tank without allowing the water in the tank to escape. Optionally, a replaceable electrical heating assembly comprises a radiation heating element, referred to herein as the lamp, a sleeve enclosing the lamp, and / or a base. Optionally, the replaceable electrical heating assembly further comprises a temperature control element. In some embodiments, the assembly comprises a metal sleeve. For example, the sleeve may include a distal end that protrudes into the tank. Optionally, the proximal end of the sleeve may be open. Optionally, the distal end of the sleeve may be sealed. In some embodiments, the sleeve may be inserted into a water heater tank in place of an existing resistive electrical heating assembly. Optionally, the assembly may be mechanically connected to the tank in a manner that prevents water in the tank from flowing out. Optionally the sleeve encloses a heating element. For example, the heating element may include a lamp. Optionally, the lamp may be accessible from outside the tank. For example, the lamp may be accessed through the proximal opening of the sleeve. Additionally or alternatively, the sleeve may be water tight in a manner, preventing contact between the water in the tank and / or the lamp. Optionally, the assembly further comprises a mechanical coupling to the tank. Optionally, the coupling may include a flange and / or a threaded element. In some embodiments the coupling may be part of the sleeve and / or may includes a separate element attached to the sleeve. Optionally, the coupling of may be compatible with the mechanical coupling of an existing heating assembly to a tank. Optionally, the container and / or a lamp inserted into the sleeve may be used as a replacement of an existing heating assembly with the sleeve. For example, the existing heating assembly may include a resistance heater. In some embodiments, a lamp comprises a source of infrared radiation, for example a halogen lamp. Optionally, when operating, the lamp emits radiation propagated through air that heats the sleeve, and / or the heated sleeve heats water in the tank for example by conduction and / or convection. In some embodiments, a halogen bulb includes an incandescent lamp that contains a tungsten filament and a small amount of halogen gas, producing a warm, intense glow. Alternatively or additionally, a system may include an Infrared heating element. For example, Infrared heating element may radiate shortwave, medium wave, and / or longwave radiation. For example, a shortwave heating elements may include a quartz tube. The shortwave element may provide rapid heat. For example, a edium wave element, may include a ceramic or metal element. The shortwave element may offer a balanced combination of warmth and energy efficiency. For example, a longwave element may include a carbon fiber panel. The longwave element may emit a gentle, consistent heat. In some embodiments, heating elements may have various forms. For example, U-shaped and I-shaped bulbs may be used. Optionally, U-shaped elements are versatile and can be used in various applications, providing even heat distribution. Optionally, I- shaped bulbs are more focused in their heating pattern, directing heat in a specific direction. For example, I-shaped elements are often employed in applications where targeted heating is required, such as in industrial processes or specific heating zones within a larger space. In some embodiments, a base comprises a mechanical device removably connected to the lamp and / or the sleeve. Optionally, the lamp may be electrically and / or mechanically connected to the base, and / or the lamp may be inserted into the sleeve, and / or the base may be connected to the sleeve. Optionally, lamp may be insertion and / or removed from within the sleeve, for example to replace a defective lamp without draining the tank. Optionally, the base may be connected and / or disconnected from the lamp without draining water from the tank. Optionally, the base may be connected and / or disconnected from the container without draining water from the tank. Alternatively or additionally, the lamp may be removeable and / or insertable without disconnecting the base. In some embodiments, the base further comprises a means for connection to an electrical power source to the lamp, for example the base may be connected to electricity and / or have mount connected the base to the lamp and supplying power to the lamp. Alternatively or additionally, electrical wires connected to an external power source enter the base at a proximal side and / or pass through the base allowing an electrical power connection with the lamp. Alternatively or additionally, an electrical connector of the lamp may protrude out the sleeve (e.g., through a proximal hole therein). In some embodiments of the present invention, the lamp may have an elongated form. Optionally, the lamp is curved and / or has a U-shape. For example, when the lamp is installed into the sleeve a distal end of the lamp may be in proximity to a distal enclosed end of the sleeve (e.g., the distal end of the lamp may be within 1 mm of the distal end of the sleeve and / or within 1cm and / or withing 10 cm., Optionally, a proximal end of the lamp may be in proximity to a distal side of the base and / or an open proximal end of the sleeve. Optionally the lamp may have two or more electrical connections to complete an electrical circuit. Optionally, two and / or all of the electrical connections are located near the proximal end of the lamp (for example, proximal to the radiation source and / or proximal to 95% of the length of the radiation source and / or 80% and / or 60% of the length of the radiation source and / or on, in, and / or near the base). While some lamps, for example selected halogen based heating elements, may have electrical connections at opposite ends of an elongated tube, such an arrangement in an elongated sleeve may result in electrical wiring connected to the base to transverse the length of the sleeve to reach an electrical connection at a distal end of an elongated lamp, such that the heat radiated by the lamp may heat the wiring and / or potentially damage the wiring. Optionally, the lamp comprises electrical connections at both the proximal and / or distal ends, and / or the wiring connected to the distal end comprises insulation to prevent radiation heat from degrading the wiring. In some embodiments, the lamp includes a tube with electrical connections at opposite ends. Optionally, the tube is bent into a U-shape and inserted into the sleeve with the closed end of the U positioned distally in the sleeve and / or the electrical connectors facing the open proximal end of the sleeve. In some embodiments of the current invention, the temperature control element may comprise a thermostat, a heat sensor, and / or or any other device for measuring heat and / or adjustably controlling the power supplied to the lamp, as is known in the art. Optionally the temperature control element may measure the temperature of the lamp, the temperature of the sleeve, the temperature of the water outside the sleeve in the tank, and / or the temperature of the air inside the sleeve. The temperature control device may reduce the power delivered to the lamp when the sensed temperature is above a threshold and / or increase the power delivered to the lamp when the sensed temperature is below a threshold. The threshold temperature may be set by a user by any means, for example a knob connected to the base, a remote-controlled adjustor, a smartphone, and / or any other method of setting a maximum temperature as is known in the art. Alternatively or additionally, the base and / or the electrical connector to the lamp may include an interface (e.g. wired and / or wireless) to an existing thermostat and / or thermal control circuitry. An aspect of some embodiments of the current invention includes a threaded portion of a base connecting a sleeve of the heating system to a water tank. The diameter of the threaded portion of the base may range between 25 mm to 50 mm and / or may range between 10 to 25 mm and / or between 50 to 100 mm. The length of the threaded portion of the base may range between 50 to 100 mm and / or between 10 to 50 mm and / or between 100 to 200 mm. An aspect of some embodiments of the current invention includes a flanged based. The base may be used to connect a sleeve to the walls and / or bottom of a water heater. The size of the opening for a flanged heating element is typically 4 inches (102 mm) and / or 6 inches (152 mm) in diameter. It may range, for example, between 90 mm to 180 mm and / or between 30 mm to 90 mm and / or between 180 mm to 300mm. The flange itself is typically 1 / 4 inch (6.3 mm) or 1 / 2 inch (12.7 mm) thick. The thickness of the flange may range, for example, between 5 to 15 mm and / or between 1 to 5 mm and / or between 15 to 30 mm. The connectors for a flanged heating element typically include bolts. Typically, a heating element may use four bolts, each of which is ranges between 5 mm to 10 mm in diameter and / or between 1mm to 50mm. The bolts are typically located on the circumference of the flange and / or evenly spaced around the opening. An aspect of some embodiments of the current invention relates to a method for retrofitting a heating assembly for a water heater with a replaceable electrical heating assembly. Optionally, the method comprises steps of removing an existing resistive electrical heating assembly from a tank, and / or installing a heating assembly in the water heater (e.g., a base and / or a container and / or a heating element as described herein above). Exemplary embodiments: The present invention, in some embodiments thereof, relates to a replaceable electrical heating assembly for a water heater tank and more particularly, but not exclusively, to a method of retrofitting a water heater tank with a replaceable electrical heating assembly. FIG. 1 is a picture of a prior art resistive electrical heating assembly that may be inserted into a water tank. The resistive electrical heating assembly comprises an enclosure 102, a base 104, a thermostat 106, and / or a resistive heating element 108. The base may include holes 118, for example, for use connecting the system to a water heater. As shown in FIG. 1, the enclosure 102 may be made of plastic, and / or may comprise holes 110 to facilitate flow of water heated by the resistive heating element through the enclosure 102 and / or between the enclosure 102 and the tank. For example, flow of water may transfer heat by convection between the resistive heating element 108 and water in the tank. FIG. 2A is a schematic diagram of a replaceable heating element fluid heater, in accordance with an embodiment of the current invention. In some embodiments of the present invention, the resistive electrical heating assembly may be replaced by a heating assembly of the current embodiment. For example, the geometry and / or dimensions of portions of the heating assembly of an embodiment of the current invention may be substantially identical to the prior art heating assembly. This may facilitate removing the prior art heating assembly from a tank and / or installing an embodiment of a heating assembly of the current invention onto the tank,. In some embodiments, the assembly may be mechanically connected to the tank in a manner that prevents water from flowing out from the tank. For example, the tank may include a hole through which the previous heating assembly passed into the tank. In some cases (e.g., when the tank is configured for a flanged heating element) the tank may include holes through which bolts 218 may have been inserted to connect the resistive electrical heating assembly, and / or the bolts 218 which may be integrally connected to the tank. Optionally, a sleeve 202 comprises a proximal flange 203 with bolts holes corresponding to the bolts 218 and / or holes of the tank 212. For example, the flange size (e.g., width) may range between 10 to 15 cm and / or between 5 to 10 cm and / or between 1 to 5 cm and / or between 15 to 25 cm (e.g., a nominal diameter of 150 to 250 mm) and / or 25 to 40 cm. Optionally, the sleeve 202 may be positioned so that a distal portion of the sleeve 202 is inserted into the tank 212 the bolts 218 optionally protrude through the corresponding bolt holes of the flange 203. The sleeve 202 (for example the flange 203 thereof) may be then fastened to the tank 212 in a water tight manner (e.g., by threading and / or tightening nuts onto the protruding bolts 218). Alternatively or additionally, the previous heating assembly may include screw type heating element. For example, a sleeve may be configured to fit the screw mount of the heating element. For example, a distal portion of the sleeve may fit through the screw hole and the sleeve include threading fitting to the threading of the screw hole. Typical sizes for the threading include for example, 11 / 2" NPT in the USA and / or M42 x 1.5 threading in Europe. In some embodiments, a lamp (e.g., lamp 208 as illustrated in FIGs.2B and 2C) will be held in place by a retainer 204. Optionally, an electrical connector 217 of the lamp will be accessible from outside the sleeve 202. In some embodiments, a tank 212 includes an inlet pipe 211 and / or an outlet pipe 213. FIG.2B is a schematic diagram of a tank 212 with the sleeve 202 removed (and shown beside the tank 212) revealing a lamp 208, in accordance with an embodiment of the current invention. In some embodiments, a heating assembly comprises a lamp 208, a sleeve 202. and / or a retainer 204. Optionally the sleeve includes base (e.g., a flange 203) that connects the sleeve to the tank 212. For example, a connector may connect the sleeve 202 to a mount 221 for a standard resistance heating element. For example, a base (e.g., flange 203) may connect sleeve 202 to a mount 221 for a flange mounted resistance heater. Alternatively or additionally, a connection may include a threaded base (that may be part of the sleeve 202 and / or a separate base connecting to the sleeve) that fits to a mount for a screw mounted resistance heating element. Alternatively or additionally, heating system of the current invention may include a sleeve and / or base designed to fit a tank configured for a replaceable heater. In some embodiments, the retainer 204 may be removably connected to the lamp 208. Optionally when the lamp 208 is inserted within the sleeve 202, the retainer 204 may be reversibly connected to the sleeve 202 and / or the lamp 208. For example, the retainer 204 may completely or partially cover the open side of the sleeve 202. For example, the retainer 204 may hold the lamp 208 in the sleeve 202. Optionally, electrical connections 217 of the lamp 208 may be exposed and / or connected to a power supply. Alternately or additionally, one or more of the , lamp and / or the base and / or the sleeve may be integrated as a single component. In some embodiments, connectors (e.g., bolts 218) may connect the retainer 204 to the tank 212 and / or the retainer 204 to the sleeve 202 and / or the sleeve 202 to the tank 212. Optionally, a gasket 220 seals the connection (e.g., to be water tight) between the tank 212 and the sleeve 202 and / or between the tank 212 and a base of the assembly (e.g., the flange 203 of the sleeve 202). Alternatively or additionally, connectors may connect the lamp to the base and / or the lamp to the sleeve. For example, the connectors (e.g., bolts 218) may include nuts and / or bolts, threaded connectors, snap on connectors, latched connectors, and / or any other type of mechanical connectors. Optionally the sleeve 202 and / or its base (e.g., flange 203) may be connected to the tank 212 using connectors (e.g., bolts 218) to form a water tight connection. Optionally additional components may be installed with the connectors, for example washers, lock nuts, O rings, gaskets 220, soft seals, and / or any other type of connector accessories and / or gaskets and / or seals. Once the sleeve 202 is connected to the tank 212, the tank may be filled with water without any leakage. Optionally, the lamp 208 and / or retainer 204 may be connected, disconnected and / or replaced without unsealing the sleeve 202 from the tank 212 and / or without draining and / or emptying from the tank 212. Optionally, connectors (e.g., bolts 218) may be separate components from the retainer 204 and / or sleeve 202 and / or lamp 208 and / or tank 212. Alternatively or additionally, the retainer 204 and / or sleeve 202 and / or lamp 208 comprise holes to facilitate connectors (e.g., bolts 218) to pass therethrough. Optionally connectors may be integral to the base and / or lamp and / or sleeve and / or tank. Optionally the lamp 208 comprises two electrical connectors 217 at the proximal end thereof. Optionally retainer 204 comprises a distal side that couples with the lamp 208 proximal end. Optionally, the retainer 204 leaves exposed electrical connectors 217 of the lamp. Optionally, the electrical connectors 217 may be any type of electrical connector. Optionally, the lamp 208 and / or retainer 204 are mechanically connected. Optionally, the sleeve may comprise a metal sheath that encloses the lamp without physical contact with the lamp. Optionally, the sleeve may comprise a geometry and / or dimensions to increase radiation of heat to the sleeve. Optionally the sleeve may be formed from a material that increase absorption of radiation from the lamp, and / or conduction of the resulting heat to water within the tank. Optionally, the portion of the sleeve surrounding the lamp may be formed from a different material than the portion of the sleeve that couples with the base. For example, the portion of the sleeve that surrounds the lamp may be copper and / or an alloy thereof, and / or the portion of the sleeve that couples with the base may be brass and / or an alloy thereof. In some embodiments, the sleeve 202 and / or a distal portion thereof may be substantially cylindrical in shape along a length. Optionally, a proximal portion of the sleeve (e.g., flange 203) may project outward facilitating attachment to the tank 212 and / or fully or partially covering the opening 214 of the tank 212. Additionally or alternatively, the proximal portion of the sleeve 202 is configured to attach to the retainer 204. In some embodiments, a proximal end of the sleeve 202 may comprise an opening to allow insertion of the lamp 208 therein. Optionally, the distal end of the sleeve 202 is sealed thereby preventing water from entering and / or contacting the lamp 208. Optionally the sleeve 202 may be straight and / or have a consistent cross section and / or a changing cross section. For example, the cross section may be circular and / or other shapes along a length, for example hexagonal, oval, rectangular, and / or any other shape. Optionally the shape of the sleeve along a length may be adapted to the contours of the shape of the lamp along the lamp’s length. In some embodiments, the sleeve 202 allows a gap between the exterior of the lamp 208 along the lamp’s length with the interior of the sleeve 202. Optionally, the lamp along a length may be in contact with the interior of the sleeve. Optionally, an exterior surface of the sleeve 202 (e.g., a distal portion thereof) may be in contact with water inside the tank 212. Optionally, the geometry and / or dimensions of the sleeve 202 allow the lamp 208, when assembled within the sleeve, to radiate heat to a portion of the sleeve 202. For example, an external surface of a portion of the sleeve 202 may be in contact with water inside the tank 212. The lamp, optionally, radiates heat to the inner surface of the portion of wall whose outer surface contacts the water. Optionally, the lamp 208 and / or the sleeve 202 may comprise substantially similar dimensions and / or geometry to the dimensions of existing water tank resistive electrical heating assembly sleeve and / or heating element, as is known in the art. Optionally, the lamp 208 and / or the sleeve 202 may comprise dimensions and / or geometry that substantially differs from existing tank electrical resistive heating elements and / or sleeves. Optionally, in the case where the dimensions of the sleeve and / or lamp differ from those of a standard resistance heater, the lamp and / or sleeve are configured to fit through an opening for an existing resistance heater and / or attach to the tank 212 in place of the standard resistance heater. For example, the length of the sleeve may range between 10 and / or 30 centimeters, 30 and / or 50 centimeters, 50 and / or 70 centimeters, 70 and / or 100 centimeters, or greater than 100 centimeters. For example, the width and / or diameter of the sleeve may range between 10 and / or 30 millimeters, 30 and / or 50 millimeters, 50 and / or 100 millimeters, 100 and / or 200 millimeters, or greater than 200 millimeters. Optionally the sleeve and / or the lamp may include any combination of lengths and / or widths and / or diameters. In some embodiments of the current invention, the lamp may include any source of electromagnetic radiation. For example, the lamp 208 may include any type and / or variety of halogen lamp, metal wire lamp, heat lamp, ceramic, far-infrared, quartz heat lamp, quartz tungsten, carbon heater, U-shaped metal rods, U-shaped halogen tube, quartz tube lights, ruby red sleeves, and / or any other type of device that produces radiation that may be absorbed and / or converted to heat by the sleeve. Optionally, the lamp 208 may consume power ranging between 1-50 watts, 50- 500 watts, 500-2000 watts, 2000-5000 watts, and / or more than 5000 watts. Optionally the amount of power supplied to the lamp may be controlled by the temperature control unit and / or by a user interface, and / or any other means of controlling voltage and / or current and / or power as is known in the art. In an embodiment of the present invention, the lamp and / or base may be an integrated unit. Optionally the sleeve may be connected to the base by electrical and / or mechanical connectors as described above. The connected lamp and / or base may be connected to the sleeve, either before or after the sleeve is connected to the tank. Additionally or alternatively, the base and / or the lamp may be connected to the tank. As is known in the art, the tank may comprise holes through which bolts may have been inserted to connect the resistive electrical heating assembly, and / or the bolts may be integrally connected to the tank. In an embodiment of the present invention, the sleeve 202 comprises corresponding bolts holes, and / or the sleeve may be positioned so that sleeve is inserted into the tank and / or the bolts protrude through the corresponding bolt holes. The sleeve 202 may be then fastened to the tank in a water tight manner by threading and / or tightening nuts onto the protruding bolts. FIG.2C is a schematic illustration of system for a replaceable electrical heating assembly for a fluid heater including an opening 219 for a thermocouple, in accordance with an embodiment of the current invention. The sleeve (e.g., sleeve 202) has been removed to facilitate illustration of the heating element 208. FIG. 2D is a schematic illustration of a replaceable heating element installed in a fluid heater, in accordance with an embodiment of the current invention. Optionally, the system includes a control system for controlling water temperature (e.g., the control system may include an electronic controller and / or a manual switch and / or a thermostat). For example, a temperature measuring device (e.g., a thermocouple) may be built into and / or attached to the sleeve and / or the tank 212. For example, there may be a sleeve connected to the base into which the thermocouple can be inserted and / or removed without draining the tank. Optionally there is a connector connecting between the thermocouple and a power supply. Optionally, power supply may supply power to the lamp 208. Alternatively or additionally, there may be a wireless connection. For example, the control system may allow connection and / or disconnection of the lamp without disconnected the sleeve from the tank. For example, there may be electrical contacts between the retainer 204 and the thermocouple and / or between the retainer and the sleeve 202. Alternatively or additionally, a connector of the thermocouple (for example mounted on one or more wires) be accessible and / or may protrude out from the outside face of the sleeve. For example, when the water gets too hot, the thermostat may disconnect the power to the lamp. FIG. 3A is a schematic diagram of a heating assembly for a water heater, in accordance with an embodiment of the current invention. In some embodiments of the present invention, the resistive electrical heating assembly may be replaced by a heating assembly of the current embodiment. For example, the geometry and / or dimensions of the heating assembly base of an embodiment of the current invention may be substantially identical to the prior art heating assembly. This may facilitate removing the prior art heating assembly from a tank and / or installing an embodiment of a heating assembly of the current invention onto the tank. Alternatively or additionally, a replaceable heating element system of the current invention may be used on a new tank and / or on a tank configured for the replaceable element system. In some embodiments, a heating assembly comprises a lamp 308, a sleeve 302. and / or a base 304. In some embodiments, the sleeve 302 is the connected to an opening 314 in a tank 312 and / or the sleeve 302 seals the opening 314 of the tank 312. For example, the sleeve 302 may be configured for attachment to and sealing an opening 314 in the tank 312 designed for a standard resistive heating element. Optionally, the sleeve 302 is configured facilitate insertion of a portion a of a lamp 308 into a hollow 354 within the sleeve without the lamp 308 contacting the fluid in the tank. For example, the sleeve 302 may enclose the lamp 308 on three sides. The fourth side is optionally, open to the outside of the tank (e.g., for inserting and / or removing the lamp 308 and / or as a path for electrical connections 316). Optionally, the base 304 may be removably connected to the lamp 308. Optionally when the lamp 308 is inserted within the sleeve 302, the base 304 may be reversibly connected to the sleeve 302 and / or the lamp 308. For example, the base 304 may cover the open side of the sleeve 302 and / or supply electrical connections to the lamp 308. Alternately or additionally, the lamp and / or the base may be integrated as a single component. In some embodiments, connectors 318 may connect the base 304 to the tank 312 and / or the base 304 to the sleeve 302 and / or the sleeve 302 to the tank 312. Optionally, a gasket 320 seals the connection (e.g., to be water tight) between the tank 312 and the sleeve 302. Alternatively or additionally, connectors may connect the lamp to the base and / or the lamp to the sleeve. For example, the connectors 318 may include nuts and / or bolts, threaded connectors, snap on connectors, latched connectors, and / or any other type of mechanical connectors. Optionally the sleeve 302 may be connected to the tank 312 using connectors 318 to form a water tight connection. Optionally additional components may be installed with the connectors, for example washers, lock nuts, O rings, gaskets 320, soft seals, and / or any other type of connector accessories and / or gaskets 320 and / or seals. Once the sleeve 302 is connected to the tank 312, the tank may be filled with water without any leakage via the sleeve 302. Optionally, the lamp 308 and / or base 304 may be connected, disconnected and / or replaced without unsealing the sleeve 302 from the tank 312 and / or without draining water from the tank 312. Optionally, connectors 318 may be separate components from the base 304 and / or sleeve 302 and / or lamp 308 and / or tank 312. Alternatively or additionally, the base 304 and / or sleeve 302 and / or lamp 308 comprise holes to facilitate connectors 318 to pass therethrough. Optionally connectors may be integral to the base and / or lamp and / or sleeve and / or tank. Optionally the lamp 308 comprises two electrical connectors 317 at the proximal end thereof. Optionally base 304 comprises a distal side that couples with the lamp 308 proximal end. Optionally, the base 304 distal side may comprise complimentary electrical connectors 316 that electrically couple with the electrical connectors 317 of the lamp. Optionally, the electrical connectors 316, 317 may be any type of electrical connector. Alternatively or additionally, the lamp 308 and / or base 304 are mechanically connected. Optionally the base may further comprise integral mechanical connectors to removably connect the base to the sleeve. In an embodiment of an aspect of the invention, the base may comprise more than one configuration of electrical connectors, wherein each configuration may be adapted to different configurations of lamp. For example, the lamp may comprise a male electrical connector and / or the base may comprise complimentary female socket connector; alternatively or additionally, the lamp may comprise a female male electrical connector and / or the base may comprise complimentary male connector to electrically couple with the lamp. Optionally, the sleeve may comprise a metal sheath that encloses the lamp without physical contact with the lamp. Optionally, the sleeve may comprise a geometry and / or dimensions to increase radiation of heat to the sleeve. Optionally the sleeve may be formed from a material that increases absorption of radiation from the lamp, and / or conduction of the resulting heat to fluid within the tank. Optionally, the portion of the sleeve surrounding the lamp may be formed from a different material than the portion of the sleeve that couples with the base. For example, the portion of the sleeve that surrounds the lamp may be copper and / or Aluminum and / or Iron an alloy thereof, and / or the portion of the sleeve that couples with the base may be brass and / or an alloy thereof. In some embodiments, the sleeve 302 and / or a distal portion thereof may be substantially cylindrical in shape along a length. Optionally, a proximal portion of the sleeve may project outward facilitating attachment to the tank 312 and / or covering the opening 314 of the tank 312. Additionally or alternatively, the proximal portion of the sleeve 302 is configured to attach to the base 304. In some embodiments, a proximal end of the sleeve 302 may comprise an opening to allow insertion of the lamp 308 therein. Optionally, the distal end of the sleeve 302 is sealed thereby preventing water from entering and / or contacting the lamp. Optionally the sleeve may have a consistent and / or changing cross section. For example, the cross section may be circular and / or other shapes along a length, for example hexagonal, oval, rectangular, and / or any other shape. Optionally the shape of the sleeve along a length may be adapted to the contours of the shape of the lamp along the lamp’s length. In some embodiments, the sleeve 302 allows a gap between the exterior of the lamp 308 along the lamp’s length with the interior of the sleeve 302. Optionally, the lamp along a length may be in contact with the interior of the sleeve. Optionally, an exterior surface of the sleeve 302 (e.g., a distal portion thereof) may be in contact with water inside the tank 312. Optionally, the geometry and / or dimensions of the sleeve 302 allow the lamp 308, when assembled within the sleeve, to radiate heat to a portion of the sleeve 302. For example, an external surface of a portion of the sleeve 302 may be in contact with water inside the tank 312. The lamp, optionally, radiates heat to the inner surface of the portion of wall whose outer surface contacts the water. Optionally, the lamp 308 and / or the sleeve 302 may comprise substantially similar dimensions and / or geometry to the dimensions of existing water tank resistive electrical heating assembly sleeve and / or heating element, as is known in the art. Optionally, the lamp 308 and / or the sleeve 302 may comprise dimensions and / or geometry that substantially differs from existing tank electrical resistive heating elements and / or sleeves. Optionally, in the case where the dimensions of the sleeve and / or lamp differ from those of a standard resistance heater, the lamp and / or sleeve are configured to fit through an opening for an existing resistance heater and / or attach to the tank 312 in place of the standard resistance heater. For example, the length of the sleeve may range between 10 and / or 30 centimeters, 30 and / or 50 centimeters, 50 and / or 70 centimeters, 70 and / or 100 centimeters, or greater than 100 centimeters. For example, the width and / or diameter of the sleeve may range between 10 and / or 30 millimeters, 30 and / or 50 millimeters, 50 and / or 100 millimeters, 100 and / or 200 millimeters, or greater than 200 millimeters. Optionally the sleeve and / or the lamp may include any combination of lengths and / or widths and / or diameters. In some embodiments of the current invention, the lamp may include any source of electromagnetic radiation. For example, the lamp 308 may include any type and / or variety of halogen lamp, metal wire lamp, heat lamp, ceramic, far-infrared, quartz heat lamp, quartz tungsten, carbon heater, U-shaped metal rods, U-shaped halogen tube, quartz tube lights, ruby red sleeves, and / or any other type of device that produces radiation that may be absorbed and / or converted to heat by the sleeve. Optionally, the lamp 308 may consume power ranging between 1-50 watts, 50- 500 watts, 500-2000 watts, 2000-5000 watts, and / or more than 5000 watts. Optionally the amount of power supplied to the lamp may be controlled by the temperature control unit and / or by a user interface, and / or any other means of controlling voltage and / or current and / or power as is known in the art. In an embodiment of the present invention, the lamp and / or base may be an integrated unit. Optionally the sleeve may be connected to the base by electrical and / or mechanical connectors as described above. The connected lamp and / or base may be connected to the sleeve, either before or after the sleeve is connected to the tank. Additionally or alternatively, the base and / or the lamp may be connected to the tank. As is known in the art, the tank may comprise holes through which bolts may have been inserted to connect the resistive electrical heating assembly, and / or the bolts may be integrally connected to the tank. In an embodiment of the present invention, the sleeve 302 comprises corresponding bolts holes, and / or the sleeve may be positioned so that sleeve is inserted into the tank and / or the bolts protrude through the corresponding bolt holes. The sleeve 302 may be then fastened to the tank in a water tight manner by threading and / or tightening nuts onto the protruding bolts. FIG.3B is a schematic diagram of a replaceable electrical heating assembly for a water heater including a thermocouple 322, in accordance with an embodiment of the current invention. Optionally, the system includes a control system 330 for controlling water temperature (e.g., the control system may include an electronic controller and / or a manual switch and / or a thermostat). For example, a temperature measuring device (e.g., a thermocouple 322) may be built into and / or attached to the sleeve 302 and / or the tank 312. Optionally there is a connector 324 connecting between the thermocouple 322 and a power supply 326. Optionally, power supply 226 may supply power to the lamp 208, for example, via a branch power connector 329. Alternatively or additionally, there may be a wireless connection. For example, the control system 330 may allow connection and / or disconnection of the lamp without disconnected the sleeve 302 from the tank 312. For example, there may be electrical contacts between the base 304 and the thermocouple 322 and / or between the base 304 and the sleeve 302. Alternatively or additionally, a connector of the thermocouple 233 (for example mounted on one or more wires) be accessible and / or may protrude out from the outside face of the sleeve 302. For example, when the water gets too hot, the thermostat may disconnect the power to the lamp. FIG. 3 is a schematic drawing of the replaceable electrical heating element, in accordance with an embodiment of the current invention. For example, a lamp may include a U-shaped bulb 308a, 308b with power connectors 317a, 317b of the ends of the U. In some embodiments, the bulb may include a built-in rectifier (e.g., as part of the control system 330). Alternatively or additionally, the bulb may not have a rectifier and / or the power supply may be prerectified. FIG. 4 is a schematic cutaway drawing of the sleeve 402 and a replaceable heating element, in accordance with an embodiment of the current invention. For example, the heating element may include a lamp 408. The lamp 408 may include a straight bulb with an electrical connector on the distal end and the proximal end. Optionally a wire passes from the distal end to the proximal end. For example, the wire may be protected from heat damage (e.g., by insulation and / or because the wire is made of a material that is stable at high temperatures). For example, the lamp 408 may be connected to power on the proximal side of the bulb (e.g., one contact may be connected to the electrical connect on the proximal side of the bulb and / or a second contact may be connected to a proximal portion of the heat protected wire running along the bulb). For example, the distal end of the bulb may protrude into the sleeve 402, but the electrical connectors may be accessible from the proximal end of the sleeve. FIG. 5 is a flow chart of a method for retrofitting a tank with a replaceable electrical heating assembly, in accordance with an embodiment of the current invention. Optionally, the method begins with draining 532 the tank. Once tank has been drained, the existing heating assembly is removed, for example the existing heating assembly may include a resistive electrical heating assembly as shown in FIG. 1. The process of removal is known in the art. The following step is installing 534 the sleeve of the replaceable electrical heating assembly. For example, the container may include a sleeve with a distal end that protrudes into the tank. The proximal end of the sleeve may be open and / or the distal end of the sleeve may be sealed. In some embodiments, the distal end of the sleeve may be inserted into a water heater tank in place of an existing resistive electrical heating assembly. In some embodiments, the sleeve is installed on its own. A proximal opening of the sleeve is optionally exposed for installing a heating element into the sleeve. For example, a lamp may be accessible from outside the tank through the proximal opening of the sleeve. Additionally or alternatively, the sleeve may be water tight in a manner, preventing contact between the fluid in the tank and / or the lamp. Altnernatively or additionally, the replaceable electrical heating assembly may be preassembled, for example preassembled in a factory, for example, the sleeve, base, lamp, and / or other elements may be connected to each other and installed together. Optionally, the following steps comprise inserting the pre-assembled assembly into the tank, and / or fastening assembly to the tank. Optionally, the pre-assembled assembly allows subsequent disconnection and / or reconnection of the lamp and / or the base from the sleeve while the sleeve remains in a water-tight connection to the tank. In some embodiments, once the sleeve is installed, the tank may be refilled 536. In some embodiments, with the sleeve installed 534, the heating element (e.g., a radiant heating element, e.g., a lamp) may be installed 538 and / or removed and / or connected to electricity and / or disconnected from electricity without draining the tank and / or while the tank is partially and / or completely full. For example, the heating element may be inserted through the proximal opening of the sleeve into the sleeve and / or connected to electricity (e.g., as explained above by connectors on the proximal end of the heating element and / or on opposite ends of the heating element (e.g., using a heat proof wire passing into the sleeve) and / or through a base attached to the sleeve etc.). In use, the heating element is optionally powered to deliver heat (e.g., by radiation) to the inner walls of the sleeve. Heat may pass from the inner surface of the walls of the sleeve to the outer surface of the walls of the sleeve (e.g., by conduction). The outer surface of the wall is optionally in contact with fluid in the tank. In an embodiment of the present invention, components of the replaceable electrical heating assembly may be installed individually. In one exemplary embodiment, the method comprises, connecting the lamp to the base, connecting the sleeve to the tank with a water-tight connection, inserting the lamp into the sleeve, and / or connecting the base to the sleeve. Optionally the method of retrofitting a tank comprises a step of installing a temperature control unit onto the base and / or the sleeve. Optionally, the temperature control unit is integrated with the base and / or lamp and / or sleeve. In an embodiment of the present invention, the method for retrofitting a tank with a replaceable electrical heating assembly optionally may additionally or alternatively comprise replacing only the lamp of a replaceable electrical heating assembly that is assembled and / or connected to the tank, for example to replace a malfunctioning lamp. Optionally replacing the lamp comprises the steps of disconnecting the base from the sleeve, removing the base and / or the connected lamp from within the sleeve, disconnecting the lamp from the base, connecting a new lamp to the base, inserting the lamp within the sleeve, and / or connecting the base to the sleeve. Optionally, the base may be connected directly to the tank and / or to the sleeve. Optionally, the lamp may be removed and / or replaced without disconnecting the base. For example, the base may comprise a hole through which the lamp may be inserted then connected to the base and / or the lamp is connected directly to the base and / or the sleeve, whereby the lamp may be removed and / or replaced without disconnecting the base from the sleeve. Optionally, the base and / or the lamp are integrated and / or are both replaced when replacing a lamp. FIG 6 is a block diagram of a water heating system in accordance with an embodiment of the current invention. Optionally a sleeve 602 is installed into a water tank 612. For example, a distal portion of the sleeve 602 may protrude into the tank and / or the outer side of the sleeve may contact water 640 in the tank. Optionally the distal end of the sleeve is closed. Optionally, a proximal portion of the sleeve is connected to the tank (e.g., via a flange and / or a threaded connection). For example, the connection between the sleeve 602 and the tank 612 may be water tight. For example, an inner side of the sleeve 602 and / or the outer side of the tank 612 may remain dry when the tank is filled. In some embodiments, the inner surface of the sleeve 602 may include a material and / or coating that increases absorption of radiant heat. For example, an inner surface of the sleeve may be blackened. For example, this may be done by applying a black coating to the surface and / or by using a chemical process to create a black layer (for example an oxide layer). A black coating may optionally include a material such as copper oxide or titanium nitride. Optionally, the inner surface may be coated with a thin film of a material such as graphite or carbon black to increase their absorptivity of radiant heat. Alternatively or additionally, an inner surface of the sleeve may be roughened. For example, this may be done by etching the surface with acid and / or by sandblasting it. Alternatively or additionally, an inner surface of the sleeve may be coated with a thin film of a material with a high refractive index. Optionally, the coating may trap radiant energy within the film, where it is absorbed by the surface. The surface treatment may be adjusted in response to a number of factors, including the type of radiant energy being absorbed, the temperature of the surface, and the desired efficiency. Additionally or alternatively, the sleeve may be highly heat conductive (e.g., Copper, steel and / or Aluminum). In some embodiments, a proximal side of the sleeve 602 includes an opening giving access from outside the tank 612 to the inside of the sleeve 602. In some embodiments, a heat source (e.g., a radiant heat source 608) is inserted into the sleeve (e.g., through the proximal opening into the inside of the sleeve 602). Optionally, the heat source may be connected to the sleeve 602. Alternatively or additionally, the heat source may not contact and / or may not be connected to the sleeve. Optionally the heat source is connected to a power source 642 outside the sleeve 602. For example, connections for connecting to the power source 642 may be on a proximal portion of the heat source. Optionally, the power source 642 and / or heat source can be connected / disconnected and / or replaced without disconnected the sleeve 602 from the tank 612 and / or without draining water from the tank 612. FIG 7 is a block diagram of a kit for retrofitting water heating system in accordance with an embodiment of the current invention. For example, the kit may include a power connector 726 for a radiant heat source (e.g., a base), a mount 704 for a radiant heat source and / or a sleeve 702 configured to hold the radiant heat source therein while contacting water on an external surface thereof. Optionally the kit may include a connector 720 for connecting the sleeve to a water tank. For example, the kit may include some all and / or any of the components described in the above embodiments. For example, the connector 720 may include a threaded connector and / or a flange connector. Optionally, the kit will also include a heating element, for example, a halogen lamp. Optionally, the kit will include connectors (e.g., nuts, bolts, electrical connectors, gaskets etc.). FIG 8 is an image of looking from the proximal end of a replacement mount for a water heater. The mount includes a flange 804 which includes a heater bracket (the mounting plate) and three openings 814 for inserting radiant heating devices (e.g., a Halogen bulb) into sleeves 802. For example, sleeves 802 may be sealed on a distal end which is inserted into a tank and / or fluid and an open proximal end. Optionally, the sleeves 802 are inserted through a hole in a tank made for a convention resistance heater into a tank. In some embodiments, once the sleeve 802 is installed and / or the flange 804 sealed to the water heater, a heating element can be installed and / or removed from the sleeve 802 through the opening 814 without needing to drain the water heater. In some embodiments, a sleeve 802 may be included in the mount for a thermometer (e.g., a thermocouple) similar to the sleeves for the heating elements. For example, the thermometer to be moved in and out of the sleeve 802 through a distal opening 846 without draining the tank and / or protecting the thermometer from fluid. Alternately or additionally, the plate includes a thermometer (e.g., a thermocouple) and / or an electrical connector. Optionally, the thermocouple is sealed inside the tank and / or in direct contact with the fluid in the tank. In some embodiments, the electrical connector supplies communication with the thermocouple 822 outside the tank (e.g., to measure the temperature of the fluid inside the tank). In some embodiments, the mount includes holes 818 for mounting bolts. FIG 8B is an image of looking from the distal end of a replacement mount for a water heater. For example, the distal side of the device is inserted inside the water heater. The distal side of the sleeves 802 are sealed. Optionally lamps inserted therein are not exposed to the fluid inside the tank. Optionally, the lamps can be changed from outside the tank without needing to drain the water heater. The flange 804, optionally, includes an opening 846 for a thermostat tube and / or holes 818 for mounting bolts. FIG 9 is an image of looking from the proximal end of a replacement mount for a water heater. The mount includes a threaded base 904 which includes two sleeves 902 for inserting radiant heating devices (e.g., a Halogen bulb). For example, sleeves 902 may be sealed on a distal end which is inserted into a tank and / or fluid and an open proximal end. Optionally, the sleeves 902 are inserted through a hole in a tank made for a convention resistance heater into a tank. In some embodiments, once the sleeve 902 is inserted, the threaded portion 918 threaded and / or sealed to the water heater. Once the threaded portion is sealed into the wall of the tank, a heating element can be installed and / or removed from the sleeve 902 through a proximal opening without needing to drain the water heater. In some embodiments, a sleeve 902 may be included in the mount for a thermometer (e.g., a thermocouple) similar to the sleeves 902 for the heating elements. For example, the thermometer to be moved in and out of the sleeve 902 through a distal opening without draining the tank and / or protecting the thermometer from fluid. Alternately or additionally, the plate includes a thermometer (e.g., a thermocouple) and / or an electrical connector. Optionally, the thermocouple is sealed inside the water tank and / or in direct contact with the fluid in the tank. In some embodiments, the electrical connector supplies communication with the thermocouple 922 outside the tank (e.g., to measure the temperature of the fluid inside the tank). Optionally, one or both of sleeves 902 and 922 are cylindrical and / or straight facilitating inserting and / or removing a lamp and / or thermometer therethrough. FIG 10 is a block diagram of a fluid heating system in accordance with an embodiment of the current invention. In some embodiments, a system for heating fluid in a tank may be installed into an opening in the tank configured for installation of a resistance heater. Optionally, the opening may be configured for flanged resistance heater. Alternatively or additionally, the system may be used to for an easily replaced heating element on a new tank and / or on a tank designed for the removable element and / or on other kinds of tanks (e.g., not just water tanks) The opening for a flanged resistance heating element is typically circular. However, some manufacturers may use a different geometry, such as a square or rectangular opening. For example, the opening for a flanged resistance heating element is typically located on the side of the tank, near the bottom and / or on the bottom of the tank and / or under the water line of the tank. The position of the opening may facilitate the heating element being immersed in the fluid and / or increasing heat transfer. The size of the opening for a flanged resistance heating element is typically 4 inches (102 mm) and / or 6 inches (152 mm) in diameter. It may range, for example, between 90 mm to 180 mm and / or between 30 mm to 90 mm and / or between 180 mm to 300mm. The flange itself is typically 1 / 4 inch (6.3 mm) or 1 / 2 inch (12.7 mm) thick. The connectors for a flanged resistance heating element typically includes bolts. The number and size of the bolts may vary depending on the manufacturer and model of the heating element. Typically, a heating element may use four bolts, each of which is ranges between 5 mm to 10 mm in diameter and / or between 1mm to 50mm. The bolts are typically located on the circumference of the flange and / or evenly spaced around the opening. The bolts may be used to secure the flange to the tank. Alternatively or additionally, the opening may be configured for a threaded resistance heating element. The diameter of the opening for the threaded resistance heating element typically ranges between 25 mm to 50 mm and / or may range between 10 to 25 mm and / or between 50 to 100 mm. The depth of the opening is typically 76.2 mm and / or may range between 50 to 100 mm and / or between 10 to 50 mm and / or between 100 to 200 mm. The opening for the threaded resistance heating element is typically circular. However, some tanks have openings with other shapes, such as square or rectangular openings. The opening for the threaded resistance heating element is typically located at the bottom and / or a lower portion of the tank. For example, this facilitates the heating element to be submerged in the fluid, where it may heat the fluid more efficiently. In some embodiments, the bottom may be more conducing to installing the threaded opening for the heating element than the sides of the tank which may be curved and / or thin. In some embodiments, the system includes a base 1004. Optionally, the base 1004 is configured to seal to the opening in the tank. Optionally, the base 1004 may include a threaded portion connecting to a tank. For example, the diameter of the threaded portion of the base may range between 25 mm to 50 mm and / or may range between 10 to 25 mm and / or between 50 to 100 mm. The length of the threaded portion of the base may range between 50 to 100 mm and / or between 10 to 50 mm and / or between 100 to 200 mm. Alternatively or additionally, the base 1004 may include a flange. The flange may be used to connect a sleeve to the walls and / or bottom of a tank. The size of flange may range, for example, between 90 mm to 180 mm and / or between 30 mm to 90 mm and / or between 180 mm to 300mm. The thickness of the flange may range, for example, between 5 to 15 mm and / or between 1 to 5 mm and / or between 15 to 30 mm. The flange optionally includes connectors. For example, the connectors may include includes bolts and / or bolt holes. Typically, a flange may include four bolts and / or bolt holes. For example, each of the bolts and / or bolt holes may have a diameter ranging between 5 mm to 10 mm and / or between 1mm to 5mm and / or between 10 to 20 mm. The bolts and / or bolt holes are typically located on the circumference of the flange and / or evenly spaced around the opening. Alternatively or additionally, a tank may be configured to house a lamp in a sleeve that can be inserted or removed without emptying the tank. For example, the sleeve may be permanently built into the tank and / or the sleeve may be connected to the tank by a dedicated fitting. In some embodiments, a distal side 1051 of the base faces into (and / or is installed inside) the tank and / or a proximal side 1052 of the base faces out of the tank (and / or is installed outside the tank). In some embodiments, the base 1004 may include an opening 1014 providing communication between the distal side 1051 and the proximal side 1052 of the base 1004. In some embodiments, a sleeve 1002 projects distally from said base 1004. Optionally, the sleeve has a hollow 1054 inside. The hollow 1054 may include a proximal opening1015. Optionally, the proximal opening 1015 is aligned to the opening 1014 through the base 1004. For example, the aligned openings 1014, 1015 may facilitate access to the hollow 1054 of the sleeve 1002 from outside the tank and / or from the proximal side 1052 of the base 1004. Optionally, the proximal opening 1013 of the sleeve 1002is sealed to the opening 1014 through the base 1004. For example, this may inhibit fluid in contact with the distal side 1051 of the base 1004 from entering the proximal opening 1013 and / or entering the hollow 1054 of the sleeve 1002. Optionally, a distal portion of the sleeve 1002 (e.g., all of the sleeve 1002 distal to the base 1004 and / or all of the sleeve 1002 distal to the proximal opening 1013) is sealed. Sealing the distal portion of the sleeve 1002 may inhibit fluid entering the hollow 1054 inside the sleeve 1002. In some embodiments, a lamp 1008 is reversibly fitting through said proximal opening 1015 into the hollow 1054 inside of the sleeve 1002. Optionally, the lamp 1008 may be inserted or removed from the sleeve 1002 without draining the tank. Optionally, the lamp 1008 does not contact fluid in the tank. For example, the sleeve 1002 and / or the hollow 1054 therein may be straight and / or cylindrical. For example, this may facilitate insertion and / or removal of the lamp 1008. In some embodiments, an electrical connection for powering the lamp is accessible through the proximal opening 1015 of the sleeve 1002. For example, the electrical connection of the lamp 1008 may project from and / or be accessible through a proximal 1015 opening in the sleeve 1002. In some embodiments, the lamp 1008 includes a radiation heating element. For example, the lamp 1008 may include a U- shaped tube (e.g., a halogen lamp) with electrical connections on the ends of the two legs of the U. Optionally, the base 1004 may have electrical connections for the lamp 1008 and / or may interconnect between electrical connectors of the lamp and a power source. In some embodiments, the system may include a second sleeve projecting distally from said base into the tank. Optionally, the second sleeve includes a hollow inside and a proximal opening to the hollow inside. The proximal opening of the second sleeve is optionally aligned to and / or sealed to the opening in the base. The second sleeve is optionally sealed distal to the proximal opening, for example, internal hollow of the second sleeve may be dry and / or accessible from outside the tank (e.g., through the proximal hole and / or hole in the base) while the outside of the sleeve may be in contact with fluid inside the tank. Optionally, a thermometer (e.g., a thermostat and / or a thermocouple) fits into the hollow inside of the second sleeve. For example, the thermometer may include an electrical connection reporting a temperature of the fluid inside the tank. The electrical connection of the thermometer may be accessible from outside the tank (e.g., through the proximal opening of the second sleeve). In some embodiments, the thermometer may be reversibly insertable into the second sleeve without draining the tank. Alternatively or additionally, a thermometer may project distally from the base with an electrical connection accessible from a proximal side of the base for reporting a temperature of the fluid inside the tank. The thermometer may be sealed to the base and / or in contact with fluid in the tank. In some embodiments, sleeve 1002 includes a material that is highly conductive to heat. For example, metal (e.g., copper, Aluminum and / or steel). In some embodiments, the system includes a base. For example, the base may include a flange on a proximal portion of the sleeve 1002. Optionally, the flange includes a bolt hole for securing the flange to a wall of the tank. Alternatively or additionally, the base may be separate from the sleeve. In some embodiments, the base and / or sleeve 1002 includes a threaded portion configured to couple to threading of the opening of the tank. $$$$FIG. 11 is a flow chart illustration of a method for mounting a replaceable electrical heating assembly onto a tank, in accordance with an embodiment of the current invention. For example, the method may be used to retrofit a tank configured for a resistance heater with an easily replaced heating element. Alternatively or additionally, the method may be used to install an easily replaced heating element on a new tank and / or on a tank designed for the removable element and / or on other kinds of tanks (e.g., not just water tanks) In some embodiments, a sleeve is installed 1134 into a hole in a water tank. For example, a distal portion of the sleeve may project into a hole in the tank and / or a proximal portion (e.g., a base) may attach to the hole in the walls and / or bottom of the tank. Optionally, the hole may be built for the sleeve and / or a sleeve may be used to retrofit a tank built for a resistance heater (e.g., the sleeve may be installed into a hole designed for a resistance heater). Optionally, the base may include a flange of the sleeve and / or a separate piece. Alternatively or additionally, the sleeve may be built into the tank. In some embodiments the sleeve is installed into an opening for a resistance heater. For example, the hole may be configured for a flanged resistance heater. In some embodiments, an opening for a flanged resistance heating element is circular. However, some manufacturers may use a different geometry, such as a square or rectangular opening. For example, the opening for a flanged resistance heating element is typically located on the side of the water heater tank, near the bottom and / or under the water line of the tank. The position of the opening may facilitate the heating element being immersed in the water and / or increasing heat transfer. Alternatively or additionally, the opening for the flanged resistance heater may be on the bottom of the tank or elsewhere. The connectors for a flanged resistance heating element typically includes bolts. The number and size of the bolts may vary depending on the manufacturer and model of the heating element. Typically, a heating element may use four bolts, each of which is ranges between 5 mm to 10 mm in diameter and / or between 1mm to 50mm. The bolts are typically located on the circumference of the flange and / or evenly spaced around the opening. The bolts may be used to secure the flange to the water heater tank. Alternatively or additionally, the opening may be configured for a threaded resistance heating element. The diameter of the opening for the threaded resistance heating element typically ranges between 25 mm to 50 mm and / or may range between 10 to 25 mm and / or between 50 to 100 mm. The depth of the opening is typically 76.2 mm and / or may range between 50 to 100 mm and / or between 10 to 50 mm and / or between 100 to 200 mm. The opening for the threaded resistance heating element is typically circular. However, some water heaters have openings with other shapes, such as square or rectangular openings. The opening for the threaded resistance heating element is typically located at the bottom and / or a lower portion of the water heater tank. For example, this facilitates the heating element to be submerged in the water, where it may heat the water more efficiently. Also, the bottom is generally more conducing to installing the threaded opening for the heating element than the sides of the tank which may be curved and / or thin. In some embodiments, a method for mounting an electrical heating element to a tank may include (for example a water heater) may include inserting 1134 a distal portion of a sleeve into a hole in the water tank. For example, the hole may be a hole initially configured for inserting a resistance heating element. Optionally, the hole may be in a side of a water tank. In some embodiments, an external surface of the sleeve is inside the water tank. For example, the external surface of the sleeve may be within an area of the tank wherein fluid (e.g., water is stored) and / or may content the fluid when the tank is in use. In some embodiment, an internal surface of said sleeve is sealed from the inside of tank and / or sealed away from portion of the exterior surface which is inside the fluid storage section of the tank. Optionally, the sleeve includes a proximal opening that is open to a space outside the tank. In some embodiments, the sleeve (e.g., a proximal portion thereof) is connected and / or sealed 1135 to the tank. For example, the proximal portion of the sleeve may be connected to a wall and / or a bottom of the tank. Optionally, the connection of the proximal portion of the sleeve with the tank is sealed and / or is water-tight. In some embodiments, once the sleeve is installed 1134 and / or sealed 1135 to the tank, the tank is filled 1136 with fluid (e.g., with water). While the tank is completely or partially full of fluid, the proximal opening and / or inside surface of the sleeve may remain dry and / or may be accessed from outside the tank and / or sealed away from the fluid. In some embodiments, a heating element is inserted 1138 into the sleeve. a radiation heating element into the inside of the sleeve while the tank is full of water. Optionally, the heating element may include a radiant heating element, In some embodiments, the heating element is connected to the sleeve and / or the tank. In some embodiments, the heating element is connected to an electrical power source. Optionally, connection to the power source is made while the tank is completely or partially full of water and / or while the heating element is inside the sleeve. For example, electrical connectors of the heating element may be accessible through the proximal opening of the sleeve and / or may project out the sleeve through the proximal opening. Alternatively or additionally, the electrical connectors of the heating element may be connected to a base of the sleeve assembly and / or the base may be connected to an electrical power source. In some embodiments, a tank may be refit and / or retrofit with a new heating element, for example, a previous heating element may be removed from the tank. Optionally, a sleeve may be installed 1134 into a hole previously used by the previous heating element. For example, the previous heating element may include a resistance heating element. In some embodiments, a heating element may be replaced without draining the tank and / or without emptying the thank. For example, a previous heating element may have been installed into a sleeve already installed 1134 into the tank. The previous heating element may be removed from inside of the sleeve while the tank is completely or partially full of water. Optionally the previous heating element may be a radiative heating element and / or the new heating element may be of the same kind as the previous element. Optionally, the new element may be inserted 1138 into the sleeve after removing the previous element. It is expected that during the life of a patent maturing from this application many relevant technologies will be developed and the scope of the terms tube and / or connector and / or plastic and / or metal are intended to include all such new technologies a priori. In sum, although various example embodiments have been described in considerable detail, variations and modifications thereof and other embodiments are possible. Therefore, the spirit and scope of the appended claims is not limited to the description of the embodiments contained herein. Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims. As used herein the term “about” refers to ± 5 % The terms "comprises", "comprising", "includes", "including", “having” and their conjugates mean "including but not limited to". The term “consisting of” means “including and limited to”. The term "consisting essentially of" means that the composition, method or structure may include additional ingredients, steps and / or parts, but only if the additional ingredients, steps and / or parts do not materially alter the basic and novel characteristics of the claimed composition, method or structure. As used herein, the singular form "a", "an" and "the" include plural references unless the context clearly dictates otherwise. For example, the term "a compound" or "at least one compound" may include a plurality of compounds, including mixtures thereof. Throughout this application, various embodiments of this invention may be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range. Whenever a numerical range is indicated herein, it is meant to include any cited numeral (fractional or integral) within the indicated range. The phrases “ranging / ranges between” a first indicate number and a second indicate number and “ranging / ranges from” a first indicate number “to” a second indicate number are used herein interchangeably and are meant to include the first and second indicated numbers and all the fractional and integral numerals therebetween. It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination or as suitable in any other described embodiment of the invention. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments, unless the embodiment is inoperative without those elements. All publications, patents and patent applications mentioned in this specification are herein incorporated in their entirety by reference into the specification, to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated herein by reference. In addition, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, they should not be construed as necessarily limiting. Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of embodiments of the invention, exemplary methods and / or materials are described below. In case of conflict, the patent specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and are not intended to be necessarily limiting.

Claims

WHAT IS CLAIMED IS:

1. A system for heating fluid in tank, the tank including an opening in the tank, the system comprising: a base configured to seal to the opening in the tank with a distal side of the base facing the inside of the tank and a proximal side of the base facing out of the tank; an opening in the base providing communication between the distal side and the proximal side; a sleeve projecting distally from said base, the sleeve having a hollow inside and a proximal opening to said hollow inside; where said proximal opening aligned to and is sealed to said opening in the base and the sleeve is sealed from fluid entering said hollow distal to said proximal opening, a heating element reversibly fitting through said proximal opening into said hollow inside of the sleeve.

2. The system of claim 1, wherein the fluid is water.

3. The system of claim 1, wherein the hole in the tank is configured for installation of a resistance heater.

4. The system of claim 1, wherein the heating element includes a lamp.

5. The system of claim 1, further comprising: an electrical connection for powering the heating element, the electrical connection accessible through said proximal opening.

6. The system of claim 5, comprising mechanical sealed connections for connection to the tank, and electrical connections to supply power to the heating element.

7. The system of claim 1, wherein said heating element includes a radiation heating element.

8. The system of claim 7, wherein said radiation heating element includes a halogen bulb.

9. They system of claim 1, wherein said heating element includes a U-shaped bulb.

10. The system of claim 1, further comprising: a second sleeve projecting distally from said base, the second sleeve having a second hollow inside and a second proximal opening to said second hollow inside; wherein said second proximal opening is aligned to another opening in the base wherein second sleeve is sealed to said second opening in the base and the second sleeve is sealed distal to said second proximal opening, a thermometer fitting into said second hollow inside of the second sleeve with an electrical connection reporting a temperature of the fluid inside the tank.

11. The system of claim 1, further comprising: a thermometer projecting distally from the base with an electrical connection accessible from a proximal side of the base for reporting a temperature of the fluid inside the tank.

12. The system of claim 1, wherein the sleeve is made of metal.

13. The system of claim 12, wherein the sleeve is made of at least one of copper, Aluminum and steel.

14. The system of claim 1, wherein said base includes a flange on a proximal portion of said sleeve.

15. The system of claim 14, wherein said flange includes a bolt hole for securing the flange to a wall of the tank.

16. The system of claim 1, wherein said base includes a threaded portion configured to couple to threading of said opening of the tank.

17. The system of claim 1, wherein said sleeve is cylindrical.

18. The system of claim 17, wherein said sleeve is straight.

19. A method for replacing an electrical heating element for a tank, comprising: Inserting a distal portion of a sleeve into a hole for a resistance heating element in a side of the tank, an external surface of said sleeve inside the tank and an internalsurface of said sleeve being sealed from said inside of the tank and having a proximal opening outside the tank: Connecting a sleeve with a seal to the tank fill tank with fluid; inserting a radiation heating element into the inside of the sleeve while the tank is at least partially full of fluid.

20. The method of claim 19, further comprising: connecting the radiation heating element to the sleeve.

21. The method of claim 19, further comprising: connecting the radiation heating element to an electrical power source.

22. The method of claim 19, further comprising: removing a previous radiation heating element from inside of the sleeve while the tank is at least partially full of fluid before said inserting said radiation heating element from inside of the sleeve.

23. The method of claim 19, further comprising: removing a resistance heating element from said hole for a resistance heating element prior to said step of inserting a distal portion of a sleeve into a hole for a resistance heating element.

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