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Back boiler
A back boiler is a device which is fitted to a residential heating stove or open fireplace to enable it to provide both room heat and domestic hot water or central heating. The device is a water filled heat exchanger enclosed at the rear of the burning chamber with a hot water output at the top of the chamber and a cold water feed at the bottom.
== Water circuit ==
The back boiler is typically used with a gravity feed circuit to the hot water cylinder, with a vent or overflow to prevent excess pressure build up. It can also be connected to a series of radiators to provide central heating but requires an electrical pump to be fitted to circulate the hot water.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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