Electric water heater with instant electric heater

Abstract

The invention discloses an electric water heater for daily use, which is characterized in that: an instant electric heater, a water flow switch and a water resistance electric shock-proof isolation pipe are serially connected and added to the rear part of a hot water pipe; the water flow switch can be positioned behind or in front of the instant electric heater; and the water resistance electric shock-proof isolation pipe must be arranged behind the instant electric heater. In the electric water heater, the instant electric heater can automatically heat by turning on a hot water tap when a water temperature in a water storing barrel is relatively low so that a user can use hot water immediately and conveniently; because the instant electric heater only heats the water flowing out, the electric water heater avoids energy waste caused by heating unused water in the water storing barrel; and because of the added water resistance electric shock-proof isolation pipe, the electric water heater can still guarantee the safety of the user when conventional electric shock-proof measurements become invalid. Because a pre-heating electrical heated tube is arranged in the electric water heater,the pre-heating device is started to heat when the water temperature in the water storing barrel is relatively low. Thus, the design power of the instant electric heater is greatly decreased and therequirement on a wire diameter of a power wire of the user is lowered.

Description

technical field [0001] The invention relates to an electric water heater for daily use, in particular to an electric water heater with instant electric heating and particularly good functions of preventing electric shock. Background technique [0002] Electric water heaters in the prior art are divided into two categories: the first type is preheating electric water heater (preheating electric heating tube is installed in the water storage tank), which is preheated 1-2 hours before water; the second type is instant electric heater . [0003] The preheating type electric water heater has the following disadvantages: 1. It needs to be preheated 1-2 hours before using water, and hot water cannot be used immediately, which is inconvenient to use. 2. To heat the whole bucket of water, if the whole bucket of water cannot be used, the remaining hot water will be used tomorrow, and the heat energy will be lost more, wasting energy. 3. When using electrical appliances, users are mo...

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Problems solved by technology

[0003] The preheating type electric water heater has the following disadvantages: 1. It needs to be preheated 1-2 hours before using water, and hot water cannot be used immediately, which is inconvenient to use

2. To heat the whole bucket of water, if the whole bucket of water is not used, the remaining hot water will be used tomorrow, and the heat energy will be lost more, wasting energy

3. When using electrical appliances, users are most worried about the safety of electricity use; products on the market generally adopt three methods to solve the safety of electricity use: improving the insulation performance of electrical appliances, grounding the shell, and installing leakage protectors, but it is inevitable that it will be completely secret. There is one caveat, the above three methods are still impossible to be foolproof, and hidden dangers still exist

[0004] The instant electric heater has the following disadvantages: 1. Because the water temperature needs to be raised immediately, a large amount of electric power is required, and the working current is very large. Since the diameter of the power wire of the general family is not very large, when the instant electric heater is working, the power supply The voltage drop on the wire is large, not only the power loss is large, but also the normal operation of other electrical appliances will be significantly affected, and the power wire may even be burned

2. When using electrical appliances, users are most worried about the safety of electricity use; currently, products on the market generally adopt three methods to solve the safety of electricity use: improving the insulation performance of electrical appliances, grounding the shell, and installing leakage protectors, but it is inevitable that they will fail There is one caveat, the above three methods are still impossible to be foolproof, and hidden dangers still exist

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