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2. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Tankless gas electronic ignition water heaters. Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power.

3. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   An 80 US gal (300 L; 67 imp gal) electric storage tank water heater was able to have a minimum energy factor of 86% under the pre-2015 standard, while under the 2015 standard, the minimum energy factor for an 80-gallon electric storage tank water heater is now 197%, which is only possible with heat pump technology. This rating measures ...

4. Water heat recycling - Wikipedia

   en.wikipedia.org/wiki/Water_heat_recycling

   Installation of a double-walled copper-on-copper heat exchanger in a vertical section of the master drain line in a Canadian home (2007) Water heat recycling (also known as drain water heat recovery, waste water heat recovery, greywater heat recovery, [citation needed] or sometimes shower water heat recovery [citation needed]) is the use of a heat exchanger to recover energy and reuse heat ...

5. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   The tested SWH system had about 20% of the impact of an electrical water heater and half that of a gas water heater. [ 51 ] Analysing their lower impact retrofit freeze-tolerant solar water heating system, Allen et al. (qv) reported a production CO 2 impact of 337 kg, which is around half the environmental impact reported in the Ardente et al ...

6. Underfloor heating - Wikipedia

   en.wikipedia.org/wiki/Underfloor_heating

   Heat pumps and chillers powered by: Electricity; Natural gas; Geothermal heat pump; Underfloor heating is particularly suitable when the energy source is a heat pump, because underfloor heating uses lower water temperatures than systems using radiators, which improves the efficiency of the heat pump. [28]

7. Hot tub - Wikipedia

   en.wikipedia.org/wiki/Hot_tub

   The hot tub pump and hot tub heater represent most of the power consumption in a hot tub and vary in use of power depending on their size. [ 4 ] Energy efficiency of portable hot tubs has been studied by the Pacific Gas and Electric Company (PGEC) , [ 5 ] leading to industry responses [ 6 ] and interest from both the California Energy ...