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2. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   [citation needed] In a comparison to a less efficient natural gas fired hot water tank, on-demand natural gas will cost 30% more over its useful life. [dubious – discuss] [citation needed] Stand-alone appliances for quickly heating water for domestic usage are known in North America as tankless or on demand water heaters.

3. 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.

4. Hot water storage tank - Wikipedia

   en.wikipedia.org/wiki/Hot_water_storage_tank

   Hot water tanks may have a built-in gas or oil burner system, electric immersion heaters. Some types use an external heat exchanger such as a central heating system, or heated water from another energy source. The most typical, in the domestic context, is a fossil-fuel burner, electric immersion elements, or a district heating scheme. [2]

5. Rheem Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/Rheem_Manufacturing_Company

   He developed the first automatic storage tank gas-fired water heater, which went into production in 1889. [24] Ruud worked for George Westinghouse (1846–1914), but eventually bought the rights to produce the product he invented and formed his own company in 1897.

6. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   Air-to-air heat pumps provide hot or cold air directly to rooms, but do not usually provide hot water. Air-to-water heat pumps use radiators or underfloor heating to heat a whole house and are often also used to provide domestic hot water. An ASHP can typically gain 4 kWh thermal energy from 1 kWh electric energy.

7. Ukraine ends supply of Russian gas to Europe - AOL

   www.aol.com/ukraine-ends-supply-russian-gas...

   Reuters reported on Wednesday that Transdniestria, a breakaway region of Moldova, a non-EU country that also receives Russian gas via Ukraine, had cut heating and hot water supplies to households ...