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  2. Furnace (central heating) - Wikipedia

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

    Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [1] Waste gas and heat are mechanically ventilated through either metal flue pipes or polyvinyl chloride (PVC) pipes that can be vented through the side or roof of the structure. Fuel efficiency in a ...

  3. Annual fuel utilization efficiency - Wikipedia

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

    The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...

  4. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    A furnace burns fuel oil or gas, ... such as the American Radiator Company, ... 65–97% for gas-fired heating; 80–89% for oil-fired and;

  5. Energy policy of the United States - Wikipedia

    en.wikipedia.org/wiki/Energy_policy_of_the...

    US natural gas production peaked in 1973, [15] and the price has risen significantly since then. Coal provided the bulk of US energy needs well into the 20th century. Most urban homes had a coal bin and a coal-fired furnace. Over the years these were replaced with oil furnaces that were easier and safer to operate. [16]

  6. Industrial furnace - Wikipedia

    en.wikipedia.org/wiki/Industrial_furnace

    The residual heat will exit the furnace as flue gas. [1] These are designed as per international codes and standards the most common of which are ISO 13705 (Petroleum and natural gas industries — Fired heaters for general refinery service) / American Petroleum Institute (API) Standard 560

  7. Propane - Wikipedia

    en.wikipedia.org/wiki/Propane

    The wholesale price of propane in the summer of 2018 was between 86 cents to 96 cents per U.S. gallon, based on a truckload or railway car load. The price for home heating was exactly double that price; at 95 cents per gallon wholesale, a home-delivered price was $1.90 per gallon if ordered 500 gallons at a time.

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