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

The school said the building’s foundation was settling in a way that could affect boiler and sewer lines, which could render the building uninhabitable with minimum notice. —Eric Adler, Kansas City Star, 2 Feb. 2026

Ecological and economical practicality By replacing fossil-fuel boilers with a system that utilizes electricity when prices are at their lowest, companies can finally align their ecological goals with economic practicality. —Aman Tripathi, Interesting Engineering, 1 Feb. 2026

Additionally, Midea’s WhisperBoost Technology provides heat in only 3 seconds, enhancing the in-home heating experience—no more waiting for outdated boiler systems that take hours to reach you. —Daniel Fusch, USA Today, 31 Jan. 2026

The loop is powered by the CAS thermal plant on Capitol Avenue, which utilizes natural gas boilers to provide heat and hot water for hundreds of state offices, as well as some private buildings such as the Bushnell Performing Arts Center. —John Moritz, Hartford Courant, 30 Jan. 2026

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