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2. Gas heater - Wikipedia

   en.wikipedia.org/wiki/Gas_heater

   Upright non-flued liquefied petroleum gas heater, 1970s A wall mounted gas heater that runs on either propane or natural gas. A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane. Indoor household gas heaters can be broadly categorized in one of two ways: flued or ...

3. Direct vent fireplace - Wikipedia

   en.wikipedia.org/wiki/Direct_vent_fireplace

   Direct vent fireplaces operate off of propane or natural gas, and are completely sealed from the interior of the building in which they are installed. Thus, no harmful byproducts are released into the room. They also release much less pollution into the atmosphere than a wood-burning fireplace. [2]

4. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   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 opening into the cold air return duct. Depending on the age of the system, forced-air gas furnaces use either a pilot light or a solid-state ignition system (spark or hot surface ignition) to light the natural gas burner ...

5. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   Combines hydronic (hot water) heating with a forced air delivery; Heat is produced via combustion of fuel (gas/propane/oil) in a boiler; A heat exchanger (hydronic coil) is placed in the air handler similar to the refrigerant coil in a Heat Pump system or a Central AC. Copper is often specified in supply and return manifolds and in tube coils.

6. Furnace (central heating) - Wikipedia

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

   Diagram of natural draft gas furnace, early 20th century. The first category of furnaces is natural draft, atmospheric burner furnaces. These furnaces consisted of cast-iron or riveted-steel heat exchangers built within an outer shell of brick, masonry, or steel. The heat exchangers were vented through brick or masonry chimneys.

7. Fireplace - Wikipedia

   en.wikipedia.org/wiki/Fireplace

   Propane, butane, and methane are all flammable gases used in fireplaces (natural gas is mostly methane, liquefied petroleum gas mostly propane). If they are allowed to accumulate unburned, gases can cause asphyxia by displacing air, [16] and gas explosions. [citation needed] Ethanol (a liquid, also sold in gels) fires can also cause severe ...