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2. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   A BTU is the energy required to raise one pound of water by one degree Fahrenheit. A US gallon of water weighs 8.3 pounds (3.8 kg). To raise 230 L (60 US gal) of water from 10 °C (50 °F) to 50 °C (122 °F) at 90% efficiency requires 60 × 8.3 × (122 − 50) × 1.11 = 39,840 BTU. A 46 kW (157,000 BTU/h) heater, as might exist in a tankless ...

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

   www.aol.com/energy-prices-high-tankless-water...

   The Rheem RTEX-18 is one of the best value electric tankless water heaters out there, priced at just over $420 at the time of writing. Packing 240 volts, this electric water heater can put out as ...

4. 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 ...

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. Energy factor - Wikipedia

   en.wikipedia.org/wiki/Energy_factor

   The energy factor metric only applies to residential water heaters, which are currently defined by fuel, type, and input capacity. [5] Generally, the EF number represents the thermal efficiency of the water heater as a percentage, since it is an average of the ratio of the theoretical heat required to raise the temperature of water drawn to the amount of energy actually consumed by the water ...

7. A. O. Smith - Wikipedia

   en.wikipedia.org/wiki/A._O._Smith

   www.aosmith.com. A. O. Smith Corporation is an American manufacturer of both residential and commercial water heaters and boilers, and the largest manufacturer and marketer of water heaters in North America. It also supplies water treatment and water purification products in the Asian market. [6] The company has 27 locations worldwide ...