heater

noun

heat·​er ˈhē-tər How to pronounce heater (audio)
1
: one that heats
especially : a device that imparts heat or holds something to be heated
2

Examples of heater in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
As with electric blankets, portable heaters are fine in an adult's bedroom, but they should not be used unsupervised in a child’s room. Michelle Ullman, The Spruce, 10 Feb. 2026 Betta fish are tropical fish, so experts recommend having a heater to regulate the temperature between mid-70 and low-80 degrees Fahrenheit to mimic that environment. Sierra Leone Starks, Parents, 10 Feb. 2026 After ending January on a slump, UConn women’s basketball star Azzi Fudd came into February on a heater and was crowned the Big East Player of the Week on Monday for the third time this season. Emily Adams, Hartford Courant, 9 Feb. 2026 Cabanas are for up to six guests with a bottle of champagne, sofa seating, heaters and cable TV for $100. Ana Gutierrez, Austin American Statesman, 7 Feb. 2026 See All Example Sentences for heater

Word History

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of heater was in the 15th century

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Cite this Entry

“Heater.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heater. Accessed 15 Feb. 2026.

Kids Definition

heater

noun
heat·​er ˈhēt-ər How to pronounce heater (audio)
: a device that heats or holds something to be heated

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