Domestic water system

Abstract

The invention relates to a domestic water system, which adopts an intelligent water meter, an automatic water replenishing valve and a buffer water tank technology to effectively eliminate the influence of water pressure, water quantity fluctuation and tiny water quantity on the precision of the intelligent water meter when domestic water is used, the metering accuracy of the intelligent water meter is high, and the intelligent water meter of a main water supply pipeline is compared with the intelligent water meter of a user side; according to the technical scheme, leakage points can be conveniently found, water stealing behaviors can be conveniently found, reliable technical guarantee is provided for operation management of a domestic water system, the system is high in universality and can be effectively used for newly building the domestic water system and transforming a traditional domestic water system, and for water supply companies and users, the win-win situation can be achieved through the technical scheme; and the social and economic significance is huge.

Description

Technical Field

[0001] The present invention relates to the technical field of domestic water, and in particular to a domestic water system using intelligent water meters, automatic water inlet valves and buffer water tank technologies. Background Art

[0002] The normal accuracy range of household water meters is usually ±2%. Taking tap water meters as an example, according to national standards, the accuracy of tap water meters is generally required to be within ±2%, which means that the deviation between the meter reading and the actual water consumption should be within plus or minus 2%. In addition, the accuracy requirements of household smart water meters are also specified under different flow conditions: Minimum flow rate (Qmin): The cumulative indication error should not exceed ±5%; Boundary flow (Qt): The cumulative indication error should not exceed ±2%; Common flow rate (Qn): The cumulative indication error should not exceed ±2%; Maximum flow rate (Qmax): The cumulative indication error should not exceed ±2%.

[0003] Factors that affect the accuracy of water meters include manufacturing quality, design structure, installation conditions, use environment and maintenance. High-quality materials and precision processing technology can improve the accuracy of water meters, while the choice of installation location, water quality conditions, temperature changes, and regular calibration and cleaning and maintenance can also affect its accuracy. In order to ensure the accuracy of water meter measurement, users should choose water meter brands and models with reliable quality and conduct regular inspections and maintenance. For general measuring instruments, the measurement error is the smallest at one-half to two-thirds of the range. The higher the accuracy, the more complex the instrument manufacturing and the more difficult the maintenance.

[0004] Compared with smart water meters, the disadvantages of traditional old-fashioned water meters mainly include the following points: 1. Low efficiency of manual meter reading: Old-style water meters require manual meter reading regularly, which is labor-intensive and prone to meter reading errors. This method is inefficient and greatly affected by objective factors. Meter readers cannot read meters regularly at the prescribed time, and meter reading dates are often advanced or postponed; 2. Lack of real-time feedback: Old-style water meters cannot provide real-time water usage data. Users need to wait for the meter reader to read the meter to know the water usage, which makes it impossible for users to understand their water usage in time and manage water usage reasonably. 3. High maintenance cost: Due to its mechanical properties, the old-fashioned water meter is more prone to wear and corrosion, which will not only pollute the water source but also damage the water meter itself, causing measurement errors and high maintenance costs; 4. Easy to be used to evade payment: The pointer of the old water meter will not move when dripping, and some users will take advantage of this to evade payment; 5. Backward technology: With the development of science and technology, people have higher and higher requirements for the accuracy and convenience of measurement. The old water meters cannot meet these requirements. Smart water meters will realize remote meter reading to households, real-time monitoring of pipe networks, and intelligent analysis of business operations through the smart meter reading platform, thus improving meter reading efficiency. 6. Unable to achieve intelligent management: Old-fashioned water meters cannot achieve remote data transmission, including data collection, storage, transmission and other steps, and cannot completely get rid of the troubles of traditional water meters in the past.

[0005] In summary, the old-fashioned water meters have obvious disadvantages in terms of efficiency, accuracy, real-time performance, maintenance costs, and intelligent management, while smart water meters have significant advantages in these aspects. Therefore, it is an inevitable trend for smart water meters to replace old-fashioned water meters. The data analysis function of smart water meters has the following advantages: 1. Water use behavior characteristics and habits: By analyzing the data collected by smart water meters, we can obtain the user's water use behavior characteristics and habits, and understand the user's water use patterns and preferences; 2. Water usage measurement: Smart water meters can provide accurate water usage measurement, helping water companies and users understand the specific water usage; 3. Detection of abnormal water use behavior: Data analysis can help detect abnormal water use behavior, such as water leakage or water theft, and conduct timely maintenance and management; 4. Water resource conservation: By analyzing users’ water use data, water companies can discover users’ wasteful water use and take targeted measures to remind users to conserve water; 5. Improved service quality: Data analysis of smart water meters can help water companies improve service quality, predict users’ water demand by analyzing water usage data, and take corresponding measures to ensure water supply; 6. Water demand prediction: Smart water meters analyze users’ historical water use data and water use habits, and use algorithm models to predict users’ water demand, helping water companies adjust water supply plans; 7. Water use optimization: The analysis and mining of smart water meter data can be used to optimize water use, helping users and water companies to use water resources more rationally; 8. Water-saving reminder: When the user's water consumption exceeds a certain threshold, the smart water meter can issue a reminder to guide the user to save water; 9. Data reporting: Smart water meters can regularly send reports on water consumption and water frequency to users, making them aware of their water use behavior and providing suggestions to help them reduce water consumption.

[0006] These data analysis capabilities make the smart water meter more than just a metering tool, but an intelligent system that can provide deep water usage insights and optimization recommendations.

[0007] However, there are also certain problems when using smart water meters, which need to be paid enough attention to: 1. Smart water meter design issues: When the flow rate is small, the smart water meter is too sensitive. Slight pressure fluctuations of the water flow may cause the meter reading to be triggered. By using mechanical transmission, such as the principle of wave power generation, it is possible to design a smart water meter that can rotate the meter for counting regardless of positive or negative fluctuations. Therefore, false readings are bound to occur, increasing the user's water cost. The abnormal water consumption and departmental interest-driven reports after the promotion of precision metering smart water meters have a great social response and have a negative impact on social fairness and credibility. The harm should not be underestimated. Technical measures must be used to eliminate the inaccurate measurement problem at the source when the flow rate is small, or even if the smart water meter has false metering readings, technical measures can be used to reduce or even eliminate it. 2. Problems with domestic water use: When users use water, there are characteristics such as randomness, temporary nature, and uncertainty. The start and stop of water facilities will cause water pressure fluctuations and water volume changes, which will cause inaccurate measurement of smart water meters.

[0008] In addition, when the water supply pipeline is under maintenance, water will be cut off in designated areas and time periods. It is necessary to store spare water in a timely manner at home to avoid affecting normal life.

[0009] In response to the above problems, it is worth further studying how to use technical means to solve the stability of domestic water systems, the accuracy of water metering, and the inconvenience in life and fire emergency caused by water outages in water systems. Summary of the invention

[0010] The purpose of the present invention is to solve the above-mentioned problems and to provide a household water system, which adopts intelligent water meters, automatic water replenishment valves, and buffer water tank water inlet and storage technologies to effectively improve the measurement accuracy and measurement stability of the intelligent water meters in the domestic water system, so as to achieve the purpose of saving water resources, saving social public resources, and improving people's quality of life and life satisfaction.

[0011] A domestic water system, characterized in that: The household water system is provided with a main water supply pipe intelligent water meter 30, a No. 1 user intelligent water meter 40, a No. 1 user automatic water replenishment valve 41, a No. 1 user buffer water tank 43, a No. 2 user intelligent water meter 50, a No. 2 user automatic water replenishment valve 51, a No. 2 user buffer water tank 53, a No. N user intelligent water meter 60, a No. N user automatic water replenishment valve 61, a No. N user buffer water tank 63, wherein N of the No. N users is greater than or equal to 3. Domestic water enters the No. 1 user's smart water meter 40, the No. 1 user's automatic water replenishment valve 41, the No. 1 user's buffer water tank 43, the No. 1 water-using facility 45, the No. 2 user's smart water meter 50, the No. 2 user's automatic water replenishment valve 51, the No. 2 user's buffer water tank 53, the No. 2 water-using facility 55, or the No. N user's smart water meter 60, the No. N user's automatic water replenishment valve 61, the No. N user's buffer water tank 63, the No. N water-using facility 65 through the main water supply pipe 29 and the main water supply pipe smart water meter 30. When the No. 1 water-using facility 45 is put into use, water is supplied to the No. 1 water-using facility 45 through the No. 1 user buffer water tank 43. When the No. 2 water-using facility 55 is put into use, water is supplied to the No. 2 water-using facility 55 through the No. 2 user buffer water tank 53. When the N-number water-using facility 65 is put into use, water is supplied to the N-number water-using facility 65 through the N-number user buffer water tank 63. When the water level in the buffer water tank 43 of user No. 1 is at a set low water level, the automatic water replenishment valve 41 of user No. 1 is opened to allow water in; when the water level in the buffer water tank 43 of user No. 1 reaches a set high water level, the automatic water replenishment valve 41 of user No. 1 is closed to stop replenishing water. When the water level in the buffer water tank 53 of the second user is at a set low water level, the automatic water replenishment valve 51 of the second user opens to let water in. When the water level in the buffer water tank 53 of the second user reaches a set high water level, the automatic water replenishment valve 51 of the second user closes to stop replenishing water. When the water level in the buffer water tank 63 of user N is at a set low water level, the automatic water replenishment valve 61 of user N opens to let water in. When the water level in the buffer water tank 63 of user N reaches a set high water level, the automatic water replenishment valve 61 of user N closes to stop replenishing water. Since the above-mentioned automatic water replenishment valve can automatically and smoothly replenish water to the buffer water tank when the corresponding buffer water tank is at a low water level, the automatic water replenishment valve will be closed when the water level in the buffer water tank reaches the set high water level, and the entire water replenishment process is continuous and smooth, thereby ensuring the stable and accurate measurement of the smart water meter; because the water pressure fluctuations and water volume changes of domestic water will occur when the water facilities are put into use, but because the water is supplied by the buffer water tank, it will not affect the measurement of the smart water meters of users No. 1, No. 2 or No. N, thereby eliminating the influence of water pressure and water volume changes on the measurement accuracy of smart water meters when traditional water facilities are put into use, and eliminating the impact of water supply systems when water facilities are put into use.

[0012] The main water supply pipe is equipped with an automatic water replenishment valve 31 and a buffer tank 33: Domestic water enters the buffer tank 33 through the main water supply pipe 29, the main water supply pipe intelligent water meter 30, the main water supply pipe automatic water replenishment valve 31, and the main water inlet pipe 32, and then enters user No. 1, user No. 2 or user No. N.

[0013] The No. 1 water facility 45, the No. 2 water facility 55 or the No. N water facility 65 includes a faucet, a hot and cold water faucet, a shower, a washing machine, a dishwasher, a water heater, etc.

[0014] The water heater includes a gas water heater, an electric water heater or a solar water heater.

[0015] The main water supply pipe 29, the No. 1 user water inlet pipe 42, the No. 2 user water inlet pipe 52, the No. N user water inlet pipe 62 and the water supply pipes between the corresponding buffer water tanks and the water-using facilities include pipes, pipe fittings and their supporting parts.

[0016] The pipe fittings include elbows, tees, crosses, reducers, pipe caps, plugs, etc.

[0017] The connection between the pipes, the pipes and the pipe fittings, and the pipe fittings and the pipe fittings is achieved by welding, hot-melt connection, expansion connection, snap connection or threaded connection.

[0018] The unspecified facilities in the domestic water system are matched with reference to or according to the reliable and mature technologies in the known water supply pipelines.

[0019] Compared with the prior art, the present invention has the following advantages: 1. Compared with the existing domestic water system, the automatic water replenishment valve and buffer water tank provided in the present invention are conventional and mature facilities in industrial applications, but when applied to the domestic water system, unexpected technical effects can be achieved: (1) Since the automatic water filling valve can automatically and smoothly fill the buffer water tank with water when the buffer water tank is at a low water level, and the automatic water filling valve is closed when the water level in the buffer water tank reaches the set high water level, the entire water filling process is continuous and smooth, thereby ensuring that the smart water meter is in a better metering range and ensuring stable and accurate metering of the smart water meter. The essential breakthrough of the present invention is to change the traditional synchronous water use and metering into asynchronous water use and metering, and accumulate large flow intermittent metering, so that the metering of the water meter is in the optimal range; (2) When domestic water facilities are put into use, water pressure fluctuations and water volume changes will occur. However, since water is supplied by a buffer tank, it will not affect the measurement of the smart water meter, thereby eliminating the impact of water pressure and water volume changes on the measurement accuracy of the water meter when traditional water facilities are put into use, and also eliminating the impact of traditional water facilities on the water supply system when they are put into use; however, the inaccuracy of user-side water meter measurement caused by domestic water pressure fluctuations and water volume fluctuations, increased user water costs, abnormal water consumption after the promotion of precision metering water meters, and departmental interest-driven reports are often seen in newspapers, causing great social repercussions and having a negative impact on social fairness and credibility. The harm should not be underestimated. The technical solution of the present invention eliminates this disadvantage invisibly; (3) Due to the water storage function of the buffer water tank, when the water supply department conducts water supply pipeline maintenance and cuts off water supply in a certain area and time period, the stored water in the buffer water tank can provide daily necessities without affecting the normal supply of domestic water; (4) The water storage capacity of the buffer water tank can effectively provide emergency rescue materials in special circumstances such as fire caused by water outage; (5) Since the smart water meters on the main water supply pipe and the smart water meters on the user end can measure accurately with extremely small measurement errors, by comparing the smart water meters on the main water supply pipe and the smart water meters on the user end, it is easy to find leaks or detect abnormal water use such as water theft, providing reliable technical support for the maintenance and operation management of the domestic water system; 2. Compared with the prior art, the technical solution of the present invention can be applied to both new domestic water systems and the transformation of traditional domestic water systems. It can give full play to the advantages of smart water meters and effectively reduce or even eliminate their shortcomings. The technology has strong versatility and low transformation cost, which is beneficial to both water supply companies and users. 3. Compared with the existing technical specifications for construction safety in the domestic water supply industry, the technical solution of the present invention, if it becomes a general technical specification in the industry, will undoubtedly have great social and economic significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a household water system of the present invention.

[0021] Figure 1 Middle: 29-main water supply pipe, 30-main water supply pipe smart water meter, 31-main water supply pipe automatic water replenishment valve, 32-main water inlet pipe, 33-buffer tank, 34-main regulating valve, 40-No. 1 user smart water meter, 41-No. 1 user automatic water replenishment valve, 42-No. 1 user water inlet pipe, 43-No. 1 user buffer water tank, 44-No. 1 user regulating valve, 45-No. 1 water use facility, 46-No. 1 user water supply pipe, 50-No. 2 user smart water meter, 51-automatic water filling valve of user No. 2, 52-water inlet pipe of user No. 2, 53-buffer water tank of user No. 2, 54-regulating valve of user No. 2, 55-water use facility No. 2, 56-water supply pipe of user No. 2, 60-smart water meter of user No. N, 61-automatic water filling valve of user No. N, 62-water inlet pipe of user No. N, 63-buffer water tank of user No. N, 64-regulating valve of user No. N, 65-water use facility No. N, 66-water supply pipe of user No. N. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 The present invention is further described in detail with reference to the accompanying drawings and specific examples.

[0023] Embodiment 1: A household water system, the household water system is provided with a main water supply pipe intelligent water meter 30, a No. 1 user intelligent water meter 40, a No. 1 user automatic water replenishment valve 41, a No. 1 user buffer water tank 43, a No. 2 user intelligent water meter 50, a No. 2 user automatic water replenishment valve 51, a No. 2 user buffer water tank 53, a No. N user intelligent water meter 60, a No. N user automatic water replenishment valve 61, a No. N user buffer water tank 63, wherein N of the No. N users is greater than or equal to 3, Domestic water enters the No. 1 user's smart water meter 40, the No. 1 user's automatic water replenishment valve 41, the No. 1 user's buffer water tank 43, the No. 1 water-using facility 45, the No. 2 user's smart water meter 50, the No. 2 user's automatic water replenishment valve 51, the No. 2 user's buffer water tank 53, the No. 2 water-using facility 55, or the No. N user's smart water meter 60, the No. N user's automatic water replenishment valve 61, the No. N user's buffer water tank 63, the No. N water-using facility 65 through the main water supply pipe 29 and the main water supply pipe smart water meter 30. When the No. 1 water-using facility 45 is put into use, water is supplied to the No. 1 water-using facility 45 through the No. 1 user buffer water tank 43 and the No. 1 user water supply pipeline 46. When the No. 2 water-using facility 55 is put into use, water is supplied to the No. 2 water-using facility 55 through the No. 2 user buffer water tank 53 and the No. 2 user water supply pipeline 56. When the N water-using facility 65 is put into use, water is supplied to the N water-using facility 65 through the N user buffer water tank 63 and the N user water supply pipeline 66. When the water level in the buffer water tank 43 of user No. 1 is at a set low water level, the automatic water replenishment valve 41 of user No. 1 opens to let in water, and domestic water enters the buffer water tank 43 of user No. 1 through the automatic water replenishment valve 41 of user No. 1 and the water inlet pipe 42 of user No. 1. When the water level in the buffer water tank 43 of user No. 1 reaches a set high water level, the automatic water replenishment valve 41 of user No. 1 closes to stop replenishing water. When the water level in the buffer water tank 53 of the second user is at a set low water level, the automatic water replenishment valve 51 of the second user opens to let in water, and domestic water enters the buffer water tank 53 of the second user through the automatic water replenishment valve 51 of the second user and the water inlet pipe 52 of the second user. When the water level in the buffer water tank 53 of the second user reaches a set high water level, the automatic water replenishment valve 51 of the second user closes to stop replenishing water. When the water level in the buffer water tank 63 of user N is at a set low water level, the automatic water replenishment valve 61 of user N opens to let in water, and domestic water enters the buffer water tank 63 of user N through the automatic water replenishment valve 61 of user N and the water inlet pipe 62 of user N. When the water level in the buffer water tank 63 of user N reaches a set high water level, the automatic water replenishment valve 61 of user N closes to stop replenishing water. Since the above-mentioned automatic water replenishment valve can automatically and smoothly replenish water to the buffer water tank when the corresponding buffer water tank is at a low water level, the automatic water replenishment valve will be closed when the water level in the buffer water tank reaches the set high water level, and the entire water replenishment process is continuous and smooth, thereby ensuring the stable and accurate measurement of the smart water meter; because the water pressure fluctuations and water volume changes of domestic water will occur when the water facilities are put into use, but because the water is supplied by the buffer water tank, it will not affect the measurement of the smart water meters of users No. 1, No. 2 or No. N, thereby eliminating the influence of water pressure and water volume changes on the measurement accuracy of smart water meters when traditional water facilities are put into use, and eliminating the impact of water supply systems when water facilities are put into use.

[0024] The main water supply pipe is equipped with an automatic water replenishment valve 31 and a buffer tank 33: Domestic water enters the buffer tank 33 through the main water supply pipe 29, the main water supply pipe intelligent water meter 30, the main water supply pipe automatic water replenishment valve 31, and the main water inlet pipe 32, and then enters user No. 1, user No. 2 or user No. N.

[0025] The No. 1 water facility 45, the No. 2 water facility 55 or the No. N water facility 65 includes a faucet, a hot and cold water faucet, a shower, a washing machine, a dishwasher, a water heater, etc.

[0026] The water heater includes a gas water heater, an electric water heater or a solar water heater.

[0027] The main water supply pipe 29, the No. 1 user water inlet pipe 42, the No. 2 user water inlet pipe 52, the No. N user water inlet pipe 62 and the water supply pipes between the corresponding buffer water tanks and the water-using facilities include pipes, pipe fittings and their supporting parts.

[0028] The pipe fittings include elbows, tees, crosses, reducers, pipe caps, plugs, etc.

[0029] The connection between the pipes, the pipes and the pipe fittings, and the pipe fittings and the pipe fittings is achieved by welding, hot-melt connection, expansion connection, snap connection or threaded connection.

[0030] The buffer tank 33 is provided with a main regulating valve 34 for adjusting the pressure and water level of the gas space of the buffer tank 33 to a suitable range.

[0031] The No. 1 user buffer water tank 43 is provided with a No. 1 user regulating valve 44 for adjusting the pressure and water level of the air space of the No. 1 user buffer water tank 43 to a suitable range.

[0032] The No. 2 user buffer water tank 53 is provided with a No. 2 user regulating valve 54 for adjusting the pressure and water level of the air space of the No. 2 user buffer water tank 53 to a suitable range.

[0033] The Nth user buffer water tank 63 is provided with an Nth user regulating valve 64 for adjusting the pressure and water level of the air space of the Nth user buffer water tank 63 to a suitable range.

[0034] The unspecified facilities in the domestic water system are matched with reference to or according to the reliable and mature technologies in the known water supply pipelines.

[0035] Although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Anyone familiar with the art can make various changes or modifications without departing from the spirit and scope of the present invention, which also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the definition of the claims of this application.

Claims

1. A household water system, characterized in that: The household water system is provided with a main water supply pipe intelligent water meter (30), a first user intelligent water meter (40), a first user automatic water replenishment valve (41), a first user buffer water tank (43), a second user intelligent water meter (50), a second user automatic water replenishment valve (51), a second user buffer water tank (53), an Nth user intelligent water meter (60), a Nth user automatic water replenishment valve (61), and a Nth user buffer water tank (63), wherein N of the Nth user is greater than or equal to 3. Domestic water enters the smart water meter (40) of user No. 1, the automatic water supply valve (41) of user No. 1, the buffer water tank (43) of user No. 1, the water use facility (45), the smart water meter (50) of user No. 2, the automatic water supply valve (51) of user No. 2, the buffer water tank (53) of user No. 2, the water use facility (55), or the smart water meter (60) of user No. N, the automatic water supply valve (61) of user No. N, the buffer water tank (63) of user No. N, the water use facility (65) of user No. N. When the No. 1 water-using facility (45) is put into use, water is supplied to the No. 1 water-using facility (45) through the No. 1 user buffer water tank (43). When the No. 2 water-using facility (55) is put into use, water is supplied to the No. 2 water-using facility (55) through the No. 2 user buffer water tank (53). When the Nth water-using facility (65) is put into use, water is supplied to the Nth water-using facility (65) through the Nth user buffer water tank (63). When the water level in the buffer water tank (43) of the first user is at a set low water level, the automatic water replenishment valve (41) of the first user is opened to allow water to flow in. When the water level in the buffer water tank (43) of the first user reaches a set high water level, the automatic water replenishment valve (41) of the first user is closed to stop replenishing water. When the water level in the buffer water tank (53) of the second user is at a set low water level, the automatic water replenishment valve (51) of the second user is opened to allow water to flow in. When the water level in the buffer water tank (53) of the second user reaches a set high water level, the automatic water replenishment valve (51) of the second user is closed to stop replenishing water. When the water level in the buffer water tank (63) of user No. N is at a set low water level, the automatic water replenishment valve (61) of user No. N is opened to allow water to flow in; when the water level in the buffer water tank (63) of user No. N reaches a set high water level, the automatic water replenishment valve (61) of user No. N is closed to stop replenishing water.

2. The domestic water system according to claim 1, characterized in that: The main water supply pipe is equipped with an automatic water replenishment valve (31) and a buffer tank (33): Domestic water enters the buffer tank (33) through the main water supply pipe (29), the main water supply pipe intelligent water meter (30), the main water supply pipe automatic water replenishment valve (31), and the main water inlet pipe (32), and then enters user No. 1, user No. 2, or user No. N.

3. The domestic water system according to claim 1, characterized in that: The No. 1 water facility (45), No. 2 water facility (55) or No. N water facility (65) includes a faucet, a hot and cold water faucet, a shower, a washing machine, a dishwasher, and a water heater.

4. The domestic water system according to claim 1, characterized in that: The main water supply pipe (29), the No. 1 user water inlet pipe (42), the No. 2 user water inlet pipe (52), the No. N user water inlet pipe (62), and the water supply pipes between the corresponding buffer water tanks and the water-using facilities include pipes, pipe fittings and their supporting parts.

5. The domestic water system according to claim 4, characterized in that: The pipe fittings include elbows, tees, crosses, reducers, pipe caps or plugs.

6. The domestic water system according to claim 4, characterized in that: In the main water supply pipe (29), the No. 1 user water inlet pipe (42), the No. 2 user water inlet pipe (52), the No. N user water inlet pipe (62), the water supply pipes between the buffer water tank and the water-using facilities, pipes are connected to pipes, pipes to pipe fittings, and pipe fittings to pipe fittings by welding, hot-melt connection, expansion connection, snap connection or threaded connection.

7. The domestic water system according to claim 3, characterized in that: The water heater includes a gas water heater, an electric water heater or a solar water heater.

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