Gas water heater capable of outputting water at constant temperature

Abstract

The invention discloses a gas water heater capable of outputting water at constant temperature. The gas water heater comprises a circulation loop and a water outlet pipeline; one end of the water outlet pipeline is connected with a water source, and the other end of the water outlet pipeline is connected with a water consumption point; the circulation loop is provided with a primary heat exchanger used for heating circulating water in the circulation loop; a secondary heat exchanger used for heating cold water in the water outlet pipeline is arranged between the circulation loop and the water outlet pipeline. The gas water heater capable of outputting water at constant temperature is provided with the primary and secondary heat exchangers to realize secondary heat exchange of the cold water in the water outlet pipeline, and avoids the problem that the cold water is excessively heated to cause high temperature scalding; moreover, residual cold water in the pipeline of the gas water heater can be recycled and heated, water waste is avoided, and the proper temperature of water in the water outlet pipeline is guaranteed, so that the comfort level of the gas water heater is improved.

Description

technical field [0001] The invention relates to a water heater, in particular to a gas water heater capable of constant temperature water outlet. Background technique [0002] At present, the vast majority of gas water heaters in the prior art use gas combustion to generate heat, and then directly heat the copper main heat exchanger, and the water flows through the main heat exchanger to be heated and supplied to the water point. The advantage of this gas water heater is that Simple structure, compact size, easy to install, but poor comfort, once the external conditions (cold water temperature, flow, gas pressure, strong wind, etc.) change, the water temperature should not be controlled; especially in summer, many households have low tap water flow (such as 4L / min), but the cold water temperature is high (such as 30 degrees), the minimum heating power of gas water heaters in the prior art is generally 5-6kW, after the water flow is heated by such a gas water heater, the out...

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Problems solved by technology

[0002] At present, the vast majority of gas water heaters in the prior art use gas combustion to generate heat, and then directly heat the copper main heat exchanger, and the water flows through the main heat exchanger to be heated and supplied to the water point. The advantage of this gas water heater is that Simple structure, compact size, easy to install, but poor comfort, once the external conditions (cold water temperature, flow, gas pressure, strong wind, etc.) change, the water temperature should not be controlled; especially in summer, many households have low tap water flow (such as 4L / min), but the cold water temperature is high (such as 30 degrees), the minimum heating power of gas water heaters in the prior art is generally 5-6kW, after the water flow is heated by such a gas water heater, the outlet water temperature will reach about 49 degrees, which is already It is far beyond the normal temperature of 38-42 degrees for normal people to take a bath. If the water flow is smaller, the temperature of the water will be higher, and the risk of burns will easily occur

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