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2. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Many tankless units have fully modulating gas valves that range from as low as 10,000 to over 1,000,000 BTUs. [clarification needed] Most electrical tankless heaters require AWG 10 or 8 wire, corresponding to 5.5 or 8.5 mm 2 for typical POU (point of use) heaters at North American voltages. Larger whole-house electric units may require up to ...

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

4. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   These furnaces were still big and bulky compared to modern furnaces, and had heavy-steel exteriors with bolt-on removable panels. Energy efficiency would range anywhere from just over 50% to upward of 65% AFUE. This style furnace still used large, masonry or brick chimneys for flues and was eventually designed to accommodate air-conditioning ...

5. Rheem Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/Rheem_Manufacturing_Company

   By 2008, a report by the United States Department of Energy ranked the firm as fifth in the US in the central air conditioner and heat pump market with a 12% market share (behind UTC/Carrier with 27%, both Goodman/Amana and American Standard/Trane with 14% and Lennox with 12%), while in the residential gas furnace market as of 2008, the company ...

6. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   The International Energy Agency has said that new gas boilers (or gas furnaces) should be banned no later than 2025. [11] Many installations and appliances have a life-span of 25 years, leading for calls that the bans must take place immediately, or at latest by 2025, because otherwise targets of net zero by 2050 cannot or are unlikely to be ...

7. Induction furnace - Wikipedia

   en.wikipedia.org/wiki/Induction_furnace

   An induction furnace is an electrical furnace in which the heat is applied by induction heating of metal. [ 1 ] [ 2 ] [ 3 ] Induction furnace capacities range from less than one kilogram to one hundred tons, and are used to melt iron and steel , copper , aluminum , and precious metals .