The hot water heating systems most often encountered in HVAC work will be low temperature systems with boiler water temperatures generally in the range of 170-200 degrees Fahrenheit. In addition, the steam heating system has a longer recovery time in producing heat after the boiler is shut down.īoilers are used in both hot water heating systems and steam heating systems. When pressure is lost in the steam heating system, steam leaves the heating units resulting in a more rapid loss of heat than in a hot water heating system. The water in the heating unit lines heats and cools slowly, resulting in an even rate of heat production. The water in a hot water heating system remains in the lines at all times. Hot water heating systems produce heat more consistently than steam heating systems. High temperature hot water boilers are >250☏.ĪDVANTAGES OF HOT WATER HEATING OVER STEAM HEATING Low temperature hot water boilers are ≤ 250☏. After heat is released, the water returns to the boiler to be reheated and recirculated.
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