Oil heater

Rarity: Common

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Science and technology

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What Wikipedia says

An oil heater, also known as an oil-filled heater, oil-filled radiator, or column heater, is a common form of convection heater used in domestic heating. Although filled with oil, it is electrically heated and does not involve burning any oil fuel; the oil is used as a heat reservoir (buffer).

Excerpt from the Wikipedia article “Oil heater”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ashley Pomeroy, CC BY 3.0, via Wikimedia Commons.