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2. AOL Mail

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3. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   Similar to gas, except rather than opening a valve, the furnace will start an oil pump to inject oil into the burner Electric The blower fan or circulator pump will be started, and a large electromechanical relay or TRIAC will turn on the heating elements Coal, grain or pellet

4. 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]

5. Furnace (central heating) - Wikipedia

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

   The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

6. 15 Things Americans Don’t Realize Are Luxuries - AOL

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   “Grew up off grid, and hot water from the tap meant you had to have the water pump working and you had to have water in the catchment. Plus propane for the water heater, so hot water wasn’t a ...

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