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  2. Hot water reset - Wikipedia

    en.wikipedia.org/wiki/Hot_water_reset

    A hot water reset control loop measures the outside air temperature; this information is used to estimate demand or heating load as the outdoor temperature varies. The supply hot water temperature is modulated up and down range in an inverse linear ratio to outside air temperature. The typical range for conventional boilers is to vary the ...

  3. Rheem Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Rheem_Manufacturing_Company

    In 2009, Rheem and Ruud were the first to sell a Hybrid Heat Pump Water Heater, which was more than twice as efficient as similar electric water heaters. [20] Also in the same year, Rheem and Ruud central air conditioners were reported to have the fewest percentage of units requiring repair among all major HVAC brands according to Consumer ...

  4. Thermostatic radiator valve - Wikipedia

    en.wikipedia.org/wiki/Thermostatic_radiator_valve

    A thermostatic radiator valve on position 2 (15–17 °C) Installed thermostatic radiator valve with the adjustment wheel removed. A thermostatic radiator valve (TRV) is a self-regulating valve fitted to hot water heating system radiator, to control the temperature of a room by changing the flow of hot water to the radiator.

  5. Edwin Ruud - Wikipedia

    en.wikipedia.org/wiki/Edwin_Ruud

    In 1889, Ruud engineered a design for an automatic storage tank-type gas water heater that used a bottom gas heater and temperature controlled gas-valve. [7] He later patented the design in 1890. [12] In October 1890, he expanded on his first water heater design, under the Fuel Gas and Manufacturing Company. [14]

  6. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    Maintaining constant shower temperature: Similarly, unlike with a tank heater, the hot water temperature from a non-modulated tankless heater is inversely proportional to the rate of the water flow—the faster the flow, the less time the water spends in the heating element being heated. Mixing hot and cold water to the "right" temperature from ...

  7. Thermostatic mixing valve - Wikipedia

    en.wikipedia.org/wiki/Thermostatic_mixing_valve

    Allows water to be stored at a higher temperature; Group Control. These provide a uniform distribution temperature for all hot water outlets in a household. Designed for multi-point applications; High flow rates (from 14 to 51 US gallons per minute (53 to 193 L/min) at 45 pounds per square inch (3.1 bar)) Temperature stability; Point-of-Use

  8. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    A tempering valve mixes enough cold water with the hot water from the heater to keep the outgoing water temperature fixed at a more moderate temperature, often set to 50 °C (122 °F). Without a tempering valve, reduction of the water heater's setpoint temperature is the most direct way to reduce scalding.

  9. Heat trap - Wikipedia

    en.wikipedia.org/wiki/Heat_trap

    Heat traps are valves or loops of pipe on the cold water inlet and hot water outlet of water heaters. The heat traps allow cold water to flow into the water heater tank, but prevent unwanted natural convection and heated water to flow out of the tank. [1] [2] Newer water heaters have built-in heat traps.

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