i Register
In some senses, boiler is marked as informal, rare. Watch for register when choosing this word.
ADJ
coal-fired, coke, electric, gas, gas-fired, oil-fired, solid-fuel, steam, water | central-heating
VERB + BOILER
install, put in | service
BOILER + VERB
come on
The heating boiler comes on automatically every morning at six o'clock.
go off | burst, explode
BOILER + NOUN
system | suit