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

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

However, floors 9 through 20 did not experience hot-water outages because they were served by a separate boiler system. —Janay Reece, CBS News, 11 Dec. 2025

The roof and windows need costly repairs, and the boilers need to be replaced. —Sophie Carson, jsonline.com, 26 Nov. 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