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  2. Electric heating - Wikipedia

    en.wikipedia.org/wiki/Electric_heating

    An electric heater is an electrical device that converts an electric current into heat. [1] The heating element inside every electric heater is an electrical resistor , and works on the principle of Joule heating : an electric current passing through a resistor will convert that electrical energy into heat energy.

  3. Patio heater - Wikipedia

    en.wikipedia.org/wiki/Patio_heater

    The below table correlates to the approximate power (BTU / Watts) required. Results may vary based on the outside temperature, obstructions and wind. Area Distance from heater Propane and natural gas heaters Electric heaters 4 sq ft 1 foot 10,000 BTUs 1,000 Watts 16 sq ft 2 feet 36 sq ft 3 feet 64 sq ft 4 feet 100 sq ft 5 feet 46,000 BTUs 144 sq ft

  4. Oil heater - Wikipedia

    en.wikipedia.org/wiki/Oil_heater

    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).

  5. Energy factor - Wikipedia

    en.wikipedia.org/wiki/Energy_factor

    The energy factor metric only applies to residential water heaters, which are currently defined by fuel, type, and input capacity. [5] Generally, the EF number represents the thermal efficiency of the water heater as a percentage, since it is an average of the ratio of the theoretical heat required to raise the temperature of water drawn to the amount of energy actually consumed by the water ...

  6. Flameless ration heater - Wikipedia

    en.wikipedia.org/wiki/Flameless_ration_heater

    A pair of flameless ration heaters. A flameless ration heater (FRH), colloquially an MRE heater, is a form of self-heating food packaging included in U.S. military Meal, Ready-to-Eat (MRE) rations since 1993. The heater is a plastic bag filled with magnesium and iron powders and table salt.

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