boiler

noun

boil·​er ˈbȯi-lər 

1

: one that boils

2

a

: a vessel used for boiling

b

: the part of a steam generator in which water is converted into steam and which consists usually of metal shells and tubes

c

: a tank in which water is heated or hot water is stored

d

chiefly British : furnace

Examples of boiler in a Sentence

Recent Examples on the Web

Infrastructural upgrades include new electrical and plumbing, generator and dual boilers. —David Caraccio, Sacbee.com, 12 Jan. 2026

Other improvements will include roof replacements, new windows and doors, security cameras and upgraded boilers. —Brian J. Rogal, Chicago Tribune, 12 Jan. 2026

That includes up to $2,000 for qualified heat pumps, water heaters, biomass stoves or biomass boilers and $1,200 for other energy-efficient property costs, including doors, windows, skylights and home energy audits — with limits per item. —Ryan Ermey, CNBC, 19 Dec. 2025

Whether your home runs on a boiler, furnace, heat pump, or other system, make sure the heating source is in good working order before snowfall. —Nafeesah Allen, Better Homes & Gardens, 11 Dec. 2025

Word History

First Known Use

circa 1540, in the meaning defined at sense 1

Phrases Containing boiler

• boiler room
• double boiler
• steam boiler

Rhymes for boiler

• broiler
• oiler
• spoiler
• toiler
• reboiler

Kids Definition

boiler

noun

boil·​er ˈbȯi-lər 

1

: a container in which something is boiled

2

: a strong metal container used in making steam

3

: a tank in which water is heated or hot water is stored