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back-boiler
back-boiler n.
Brit. 
/ˈbakˌbɔɪlə/
, /ˈbakˌbɔɪlə/U.S. /ˈbækˌbɔɪlər/
a boiler behind a domestic fire or cooking range./ˈbækˌbɔɪlər/ΘΚΠ
the world > matter > properties of materials > temperature > heat > heating or making hot > that which or one who heats > [noun] > a device for heating or warming > for heating water
water heater1824
water bar1843
geyser1878
chip heater1900
immersion heater1914
instantaneous (water-)heater1935
back-boiler1939
fridge-heater1957
1939 L. J. Overton Domest. Hot Water Supply iii. 12 The Back-Boiler, for setting in brickwork behind a kitchen range or at the back of an ordinary fireplace.
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