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2. Rheem Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/Rheem_Manufacturing_Company

   www .rheem .com. Rheem Manufacturing Company is an American privately held manufacturer that produces residential and commercial water heaters and boilers, as well as heating, ventilating and air conditioning (HVAC) equipment. The company also produces and sells products under the Ruud brand name.

3. Pilot light - Wikipedia

   en.wikipedia.org/wiki/Pilot_light

   A pilot light is a small gas flame, usually natural gas or liquefied petroleum gas, which serves as an ignition source for a more powerful gas burner. Originally a pilot light was kept permanently alight, but this wastes gas. Now it is more common to light a burner electrically, but gas pilot lights are still used when a high energy ignition ...

4. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   Gas-fired forced-air furnaces have a burner in the furnace fuelled 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] Each room has an outlet from the duct system, often mounted in the floor or low on the wall – some rooms will also have an ...

5. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power. There are also heaters that use several single-phase circuits instead.

6. Lighting control system - Wikipedia

   en.wikipedia.org/wiki/Lighting_control_system

   The benefit of architectural lighting control systems in the theater is the ability for theater staff to turn worklights and house lights on and off without having to use a lighting control console. Alternately, the light designer can control these same lights with light cues from the lighting control console so that, for instance, the ...

7. Electricity on Shabbat - Wikipedia

   en.wikipedia.org/wiki/Electricity_on_Shabbat

   It is not permitted to open the door if the light will turn on because, unlike with the motor running, the light turning on is a Biblical prohibition whereas the motor running may be a Rabbinic prohibition, and also, the light is turned on immediately as an effect of opening the refrigerator whereas the motor turning on is an indirect effect.