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  2. 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 ...

  3. Solar hot water in Australia - Wikipedia

    en.wikipedia.org/wiki/Solar_hot_water_in_Australia

    acts as a replacement of a natural gas or LPG water heater with a solar-system; is a solar-driven pre-heater, which is additional to an existing natural gas of LPG water heating system; is a retrofit kit, which is additional to an existing electric water heater; New houses and buildings can get a rebate by selling the RECs their system is ...

  4. Thermosiphon - Wikipedia

    en.wikipedia.org/wiki/Thermosiphon

    Thermosyphon circulation in a simple solar water heater (not a working model; there is no water supply to replenish the tank when the tap is used). A thermosiphon (or thermosyphon) is a device that employs a method of passive heat exchange based on natural convection, which circulates a fluid without the necessity of a mechanical pump.

  5. Microgeneration - Wikipedia

    en.wikipedia.org/wiki/Microgeneration

    Passive solar water heating is another effective method of utilizing solar power. The simplest method is the solar (or a black plastic) bag. The simplest method is the solar (or a black plastic) bag. Set between 5 and 20 litres (1 and 5 US gal) out in the sun and allow to heat.

  6. Ground source heat pump - Wikipedia

    en.wikipedia.org/wiki/Ground_source_heat_pump

    A heat pump in combination with heat and cold storage. A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons.

  7. 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 ...