Heat meter

Rarity: Common

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Notion

Domain

Science and technology

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What Wikipedia says

A heat meter, thermal energy meter, or BTU meter is a device that measures thermal energy provided by a source, such as a central heating system, by measuring the flow rate of the heat transfer fluid and the change in its temperature (ΔT) between the outflow and return legs of the system.

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

Image: Николай, CC0, via Wikimedia Commons.