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  2. Pilot light - Wikipedia

    en.wikipedia.org/wiki/Pilot_light

    The appliance efficiency of a gas-fired balanced flue local space heater in pilot light mode is almost equal with the appliance efficiency measured at the reduced power of the appliance, which efficiency is between 65–95% based on the low calorific value of the consumed gas, making part of the pilot light's energy consumption into useful heat.

  3. Thermostat - Wikipedia

    en.wikipedia.org/wiki/Thermostat

    The left side is connected via one wire of a pair to the heater control valve. Moving contact attached to the bimetal coil. Thence, to the heater's controller. Fixed contact screw. This is adjusted by the manufacturer. It is connected electrically by a second wire of the pair to the thermocouple and the heater's electrically operated gas valve ...

  4. 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 ...

  5. Bleed screw - Wikipedia

    en.wikipedia.org/wiki/Bleed_screw

    Bleed screw key Bleed screw key in use at a domestic radiator. On a home radiator unit, the bleed screw can be opened, usually by means of a key, to allow unwanted air to escape from the unit. Bleed screws are also found on some pump types fulfilling a similar purpose. They are most often located at the top of the radiator on the side of the ...

  6. Pilot hole - Wikipedia

    en.wikipedia.org/wiki/Pilot_hole

    When a screw is driven without a pilot hole, or with too small a pilot hole, the core of the screw may bind and lead to the screw being broken. The appropriate pilot hole will prevent binding while providing sufficient friction to keep the screw from loosening. For common wood screws, the pilot providing clearance for the core of the screw may ...

  7. Screw mechanism - Wikipedia

    en.wikipedia.org/wiki/Screw_mechanism

    Records indicate that the water screw, or screw pump, was first used in Ancient Egypt, [10] [11] some time before the Greek philosopher Archimedes described the Archimedes screw water pump around 234 BC. [12] Archimedes wrote the earliest theoretical study of the screw as a machine, [13] and is considered to have introduced the screw in Ancient ...