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  2. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    Under the pre-2015 standard, a 75 US gal (280 L; 62 imp gal) gas storage water heater with a nominal input of 22 kW (75,000 BTU/h) or less was able to have an energy factor as low as 53%, while under the 2015 standard, the minimum energy factor for a 75-US-gallon gas storage tank water heater is now 74%, which can only be achieved by using ...

  3. Solar water heating - Wikipedia

    en.wikipedia.org/wiki/Solar_water_heating

    The figures are fairly similar between the above collectors, yielding some 4 kWh/day in a temperate climate and some 8 kWh/day in a tropical climate when using a collector with a 2 m 2 absorber. In the temperate scenario this is sufficient to heat 200 litres of water by some 17 °C. In the tropical scenario the equivalent heating would be by ...

  4. 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 ...

  5. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    The copper tank contains heating elements with 7.2 kW maximum power. Tankless water heaters — also called instantaneous, continuous flow, inline, flash, on-demand, or instant-on water heaters — are water heaters that instantly heat water as it flows through the device, and do not retain any water internally except for what is in the heat ...

  6. Solar thermal collector - Wikipedia

    en.wikipedia.org/wiki/Solar_thermal_collector

    An array of evacuated flat plate collectors next to compact solar concentrators A comparison of the energy output (kW.h/day) of a flat plate collector (blue lines; Thermodynamics S42-P [dubious – discuss]; absorber 2.8 m 2) and an evacuated tube collector (green lines; SunMaxx 20EVT [dubious – discuss]; absorber 3.1 m 2. Data obtained from ...

  7. New Biden water heater ban will drive up energy prices for ...

    www.aol.com/biden-water-heater-ban-drive...

    Under the policy, new non-condensing, natural gas-fired water heaters will be prohibited for sale starting in 2029 due to concerns about carbon-dioxide emissions.