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2. Underfloor heating - Wikipedia

   en.wikipedia.org/wiki/Underfloor_heating

   Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical heating elements embedded in a floor. Heating is achieved by conduction, radiation and convection. Use of underfloor heating dates back to the Neoglacial and Neolithic periods.

3. Pulsed-power water treatment - Wikipedia

   en.wikipedia.org/wiki/Pulsed-power_water_treatment

   Pulsed-power water treatment is the process of using pulsed, electro-magnetic fields into cooling water to control scaling, biological growth, and corrosion.The process does not require the use of chemicals and helps eliminate environmental and health issues associated with the use and life-cycle management of chemicals used to treat water. [1]

4. Heating film - Wikipedia

   en.wikipedia.org/wiki/Heating_film

   He then took the same idea to create a heating system that fits American houses. Wright invented modern radiant floor heating, using hot water running through pipes instead of hot air through flues. [5] A heating film, itself, is a variation of the modern ondol, but it doesn't require hot water and pipes as it is fully electric.

5. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   A hybrid water heater is a water heating system that integrates technology traits from both the tank-type water heaters and the tankless water heaters. [5] It maintains water pressure and consistent supply of hot water across multiple hot water applications, and like its tankless cousins, it is efficient and can supply a continuous flow of hot ...

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

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

   The rule will lead to the replacement over three decades of more than 1 million gas-burning appliances — including an estimated 700,000 pool heaters and 300,000 tankless water heaters — with ...

7. Self-regulating heater - Wikipedia

   en.wikipedia.org/wiki/Self-regulating_heater

   A positive-temperature-coefficient heating element (PTC heating element), or self-regulating heater, is an electrical resistance heater whose resistance increases significantly with temperature. The name self-regulating heater comes from the tendency of such heating elements to maintain a constant temperature when supplied by a given voltage.