Guide: The atmospheric hot water boiler is directly connected to the tap water or heating system in a closed cycle. That is, the exhaust steam pipe connected to the atmosphere on the boiler body is used as the return water pipe, so that the boiler body is always in a state of full water and pressure.

　　The atmospheric hot water boiler is directly connected to the tap water or heating system in a closed cycle. That is, the exhaust steam pipe connected to the atmosphere on the boiler body is used as the return water pipe, so that the boiler body is always in a state of full water and pressure.

　　This closed cycle has two hazards: The first is that when the boiler water temperature is too high, the generated steam cannot be discharged, so the pressure will continue to rise, explosions and leakage accidents may occur at any time. The second is that even if the boiler water temperature is not high, a large amount of steam will not be produced, but due to the function of the circulating pump, the boiler body will withstand the hot water circulation pressure is higher.

　　The atmospheric hot water boiler is installed on the first floor or basement, and the hot water storage tank is installed on the roof. This method also uses the exhaust pipe connected to the atmosphere on the boiler body as the return pipe. Although the boiler body does not bear the pressure exerted by the ring pump, the boiler bears the static pressure of the hot water provided by the high storage tank at all times. The higher the floor, the higher the static pressure of the hot water.