1. A boiler that supplies central heating and/or hot water, fitted into a fireplace recess, normally behind a gas fire

Derived forms: back boilers

• resistor
• resit
• resize
• resmudge
• resole
• resoluble
• resolute
• resolutely
• resoluteness
• resolution
• resolvable
• resolve
• resolved
• resolvent
• resolver
• resolving
• resolving power
• resonance
• resonant
• resonant circuit
• resonantly
• resonate
• resonating
• idiomatic expression
• idiomatical