Boiler

A boiler is a closed vessel in which fluid is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, central heating, boiler-based power generation, cooking, and sanitation.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

WARMINGHOME

A warmer home — heating systems and heat pumps, insulation and efficiency, and the calculators that keep every room cozy.

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