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  2. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    All new gas storage tank water heaters with capacities smaller than 55 US gal (210 L; 46 imp gal) sold in the United States in 2015 or later shall have an energy factor of at least 60% (for 50-US-gallon units, higher for smaller units), increased from the pre-2015 minimum standard of 58% energy factor for 50-US-gallon gas units. Electric ...

  3. Water-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Water-tube_boiler

    The drums are linked by straight watertubes, allowing easy tube-cleaning. This does, however, mean that the tubes enter the drums at varying angles, a more difficult joint to caulk. Outside the firebox, a pair of cold-leg pipes between each drum act as downcomers. [14] Due to its three drums, the Yarrow boiler has a greater water capacity.

  4. Electric heating - Wikipedia

    en.wikipedia.org/wiki/Electric_heating

    30 kW resistance heating coils This radiant heater uses tungsten halogen lamps. Electric heating is a process in which electrical energy is converted directly to heat energy. Common applications include space heating, cooking, water heating and industrial processes. An electric heater is an electrical device that converts an electric current ...

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