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

• nonfigurative
• nonfinancial
• nonfissile
• nonfissionable
• nonflammable
• nonflavored
• nonflavoured
• nonflowering
• nonfluent aphasia
• nonfunctional
• nong
• nonglutinous
• nongonococcal urethritis
• nongovernmental organisation
• nongovernmental organization
• nongranular
• nongregarious
• nonhairy
• nonharmonic
• nonhereditary
• nonheritable
• nonhierarchic
• nonhierarchical
• nonhuman
• nonillion