Definition of boiler noun from the Oxford Advanced Learner's Dictionary

 

boiler

 noun
noun
BrE BrE//ˈbɔɪlə(r)//
 
; NAmE NAmE//ˈbɔɪlər//
 
(also furnace especially in North American English) House equipment
 
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a container in which water is heated to provide hot water and heating in a building or to produce steam in an engine a central heating boiler a gas boiler a back boiler (= located behind a fire) See related entries: House equipmentExtra examples I’ve just heard the hot water boiler come on. She took the clothes to the boiler room to hang them up. There was a gas boiler mounted on the far wall. You might need to install a new boiler.
See the Oxford Advanced American Dictionary entry: boiler