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  2. Electric heating - Wikipedia

    en.wikipedia.org/wiki/Electric_heating

    Circulation heaters or "direct electric heat exchangers" (DEHE) use heating elements inserted into a "shell side" medium directly to provide the heating effect. All of the heat generated by the electric circulation heater is transferred into the medium, thus an electric heater is 100 percent efficient.

  3. Energy conversion efficiency - Wikipedia

    en.wikipedia.org/wiki/Energy_conversion_efficiency

    The wall-plug efficiency is the measure of output radiative-energy, in watts (joules per second), per total input electrical energy in watts. The output energy is usually measured in terms of absolute irradiance and the wall-plug efficiency is given as a percentage of the total input energy, with the inverse percentage representing the losses.

  4. Space heater - Wikipedia

    en.wikipedia.org/wiki/Space_heater

    In the United States, Underwriters Laboratories' UL 1278 [11] (for portable electric space heaters) and UL 1042 [12] standards (for portable and fixed baseboard electric heaters) certify heater safety. Although the General Services Administration had Specification W-H-193 [13] for

  5. These Highly Rated Amazon Space Heaters Live Up to the Hype - AOL

    www.aol.com/highly-rated-amazon-space-heaters...

    This space heater is designed to produce more heat and use less energy than a standard space heater. The manufacturer notes that most space heaters produce 155°F at 2.2 meters per second, while ...

  6. Half a Million Electric Space Heaters Recalled Due to ... - AOL

    www.aol.com/finance/half-million-electric-space...

    The smart electric space heaters can overheat, posing fire and burn hazards. Testing determined the smart electric space heaters don't comply with the industry safety standard, UL 1278, so the ...

  7. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    The heat exchangers were vented through brick or masonry chimneys. Air circulation depended on large, upwardly pitched pipes constructed of wood or metal. The pipes would channel the warm air into floor or wall vents inside the home. This method of heating worked because warm air rises.

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