👉 👉 Traditional gas boilers are categorized based on sanitary hot water heating methods, primarily including gas heating boilers with sleeve-type heat exchangers and gas heating boilers with plate heat exchangers.
👉 👉 In the sleeve-type heat exchanger, a large outer pipe encases a smaller inner pipe. The outer pipe heats the central heating water, and sanitary water flows within the inner pipe, heated indirectly through the heated outer pipe. To optimize heat transfer, the inner pipe adopts a configuration of multiple semi-circular segments, maximizing the heating surface area and enhancing heating efficiency. The illustration below provides a visual representation of this mechanism.
👉 👉 Regarding the gas boiler with sleeve-type heat exchanger, in the process of using domestic hot water, when the user temporarily turns off the domestic hot water and then opens the hot water faucet or shower in a short time, because the water in the pipes does not flow, the waste heat in the combustion chamber and the high-temperature water in the outer pipe will continue to heat water in the inner pipe, and there will be a period of scalding water when the faucet or shower is turned on, resulting in big temperature fluctuate domestic hot water.
