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  2. Rheem Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Rheem_Manufacturing_Company

    Rheem is an American company that produces water heaters, boilers, and HVAC equipment. It was founded in 1925 and has expanded globally, acquiring brands such as Ruud, Raypak, and Richmond Water Heaters.

  3. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

  4. Heating, ventilation, and air conditioning - Wikipedia

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

    HVAC stands for heating, ventilation, and air conditioning, which is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Learn about the history, functions, and types of HVAC systems, as well as their applications and benefits.

  5. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    Learn about the origins and evolution of central heating systems, from ancient Korea and Rome to modern times. Compare different methods of heat generation, distribution and sources, such as fossil fuel, electricity, solar and district heating.

  6. Annual fuel utilization efficiency - Wikipedia

    en.wikipedia.org/wiki/Annual_fuel_utilization...

    AFUE stands for annual fuel utilization efficiency, a measure of space-heating furnaces and boilers. It is a dimensionless ratio of useful energy output to energy input, expressed as a percentage. Learn how to determine the AFUE and see typical values for different fuels and technologies.

  7. Edwin Ruud - Wikipedia

    en.wikipedia.org/wiki/Edwin_Ruud

    Edwin Ruud (9 June 1854 – 9 December 1932) was a Norwegian-American mechanical engineer and inventor who immigrated to the United States where he designed, sold, and popularized the tankless water heater.

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