Water heating system and control method thereof

Abstract

The invention discloses a water heating system and a control method thereof. The water heating system comprises a gas-fired water heater, an electric water heater, a cold water pipe and an instant-heating constant-temperature water mixing valve, wherein a hot water outlet of the gas-fired water heater is connected with a water inlet of the electric water heater through a hot water pipe; one end of the cold water pipe is connected with a municipal water supply, and the other end of the cold water pipe is connected with a cold water inlet of the of the gas-fired water heater; the instant-heating constant-temperature water mixing valve is provided with a hot water inlet and a cold water inlet, the hot water inlet is connected with a water outlet of the electric water heater, and the cold water inlet is connected with the other end of the cold water pipe; the instant-heating constant-temperature water mixing valve is used for heating water flow at the hot water inlet when the temperature of water at the hot water inlet is lower than the set temperature of the gas-fired water heater and carrying out constant-temperature control over the heated water flow. The water heating system enables the water temperature to be more accurate, and therefore the purpose of stepless temperature adjustment is realized. Even though hot water is used for the first time, the outlet water temperature at the water use spot is not too low, water use comfort is improved, and user experience is improved.

Description

technical field [0001] The invention relates to the technical field of electrical appliances, in particular to a hot water system and a control method for the hot water system. Background technique [0002] Water heaters are mainly divided into four categories, namely electric water heaters, gas water heaters, solar water heaters and air energy water heaters. The four types of water heaters have their own advantages and disadvantages, and are suitable for the needs of different groups of people. With the continuous improvement of people's living standards, people's requirements for hot water are also getting higher and higher. For example, the demand for hot water consumption is increasing, hot water is available when the tap is turned on, and the number of water points is increasing at the same time. [0003] However, in a hot water system connected in series with a gas water heater and an electric water heater, it is difficult to alleviate the influence of cold water in th...

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Problems solved by technology

[0003] However, in a hot water system connected in series with a gas water heater and an electric water heater, it is difficult to alleviate the influence of cold water in the pipeline on the outlet water temperature and the influence of water pressure fluctuations on the outlet water temperature due to the small size of the electric water heater (such as the small kitchen treasure), for example, when When the management between the gas water heater and the electric water heater is long, when the user uses the hot water faucet, the water that enters the electric water heater starts to be cold water, which will quickly reduce the water temperature in the electric water heater, so that the outlet water temperature of the electric water heater will drop greatly, affecting comfort In addition, when the total household water pressure fluctuates greatly, the cold water pressure fluctuation of the bathroom water point is smaller than the hot water pressure, resulting in hot and cold water temperature, which affects the use of hot water and leads to poor user experience

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