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2. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Tankless gas electronic ignition water heaters. Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power.

3. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Gas tankless water heaters shall have an energy factor of 82% or greater under the 2015 standards, which corresponds to the pre-2015 Energy Star standard. In 2022 the Department of Energy proposed rules that would take effect in 2026 and would effectively eliminate inefficient non-condensing gas water heaters in commercial buildings.

4. Energy Prices Are High—And These Tankless Water Heaters Can ...

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5. Tankless water heaters - Wikipedia

   en.wikipedia.org/?title=Tankless_water_heaters&...

   This page was last edited on 13 October 2018, at 17:55 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

6. 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.

7. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.