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2. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   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. There are also heaters that use several single-phase circuits instead.

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. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   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 ...

5. US plans water heater standards, says they will save ... - AOL

   www.aol.com/news/us-plans-water-heater-standards...

   The U.S. Department of Energy on Friday proposed energy efficiency standards on water heaters it said would save consumers $11.4 billion on energy and water bills annually. The standards on ...

6. Own a pool in Southern California? New air-quality rule ...

   www.aol.com/news/own-pool-southern-california...

   Bans on large gas-fired units and pool heaters will begin in 2027, and high-temperature units in 2029. Gas-fired water heaters will be banned from existing buildings once the appliances reach a ...

7. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Water heating is a heat transfer process that uses an energy source to heat water above its initial temperature. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating. In industry, hot water and water heated to steam have many uses. Domestically, water is traditionally heated in vessels known as water heaters ...