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  2. Instant hot water dispenser - Wikipedia

    en.wikipedia.org/wiki/Instant_hot_water_dispenser

    On the other hand, an instant hot water dispenser without a tank does not waste significant energy. When hot water is needed, the instant heater consumes at least 2000 watts to produce hot water at 92 °C and above. [citation needed] The hot water flow rate is approximately 20 litres per hour. Comparing this with the insulated tank type of hot ...

  3. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    Built-in small storage water reservoir as part of heat exchanger (typically between 2 US gallons (7.6 L; 1.7 imp gal) to 20 gallons) Dual activation: flow sensing and thermostat control; Hybrid water heaters can be gas-fired (natural gas or propane), or be electrically powered using a combination of heat pump and conventional electric heating ...

  4. 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 ...

  5. Undertank heater - Wikipedia

    en.wikipedia.org/wiki/Undertank_heater

    The hot zone is just above the heater; the opposite zone, the cold zone, is where the live food and the water bowl would be placed. A substrate between the pad and the tank is necessary, as is a thermostat or rheostat to prevent it from overheating and burning the animals. Malfunction in an under tank heater could result in higher temperatures ...

  6. 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 ...

  7. Dipper well - Wikipedia

    en.wikipedia.org/wiki/Dipper_well

    The dipper well has been criticized in the United States as wasteful since on average it pumps 30 to 60 US gallons (110 to 230 L) of water an hour and is normally left running continuously. [ 1 ] [ 3 ] [ 5 ] Because its potential for water waste is counteracted by a potential for increased sanitation, most health regulations do not prohibit or ...