e/Back boiler

Information
has gloss	eng: 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.
lexicalization	eng: back boiler
instance of	(noun) sealed vessel where water is converted to steam boiler, steam boiler