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2. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Moreover, the transfer of electric energy to the water in an electric shower head is very efficient, approaching 100%. Electric showers may save energy compared to electric tank heaters, which lose some standby heat. 1500W Immersion heater with sheathed element, designed to be immersed in a small vessel such as a carafe or bucket.

3. Energy conversion efficiency - Wikipedia

   en.wikipedia.org/wiki/Energy_conversion_efficiency

   Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical , electric power , mechanical work , light (radiation), or heat .

4. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   [clarification needed] Most electrical tankless heaters require AWG 10 or 8 wire, corresponding to 5.5 or 8.5 mm 2 for typical POU (point of use) heaters at North American voltages. Larger whole-house electric units may require up to AWG 2 wire. In gas appliances, both pressure and volume requirements must be met for optimum operation.

5. New Law Gives You $8,000 for Free To Make These 5 Home ... - AOL

   www.aol.com/finance/law-gives-8-000-free...

   The nonbusiness energy property credit also applies to heat pumps and other energy efficient water heating appliances. The cap for this home improvements extends to $2,000 per year. Solar Panels ...

6. 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 ...

7. Storage water heater - Wikipedia

   en.wikipedia.org/wiki/Storage_water_heater

   Solar heat is clean and renewable. This is the most modern system. Increasingly, solar powered water heaters are being used. Their solar thermal collectors are installed outside dwellings, typically on the roof or walls or nearby, and the potable hot water storage tank is typically a pre-existing or new conventional water heater, or a water heater specifically designed for solar thermal.