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2. Gas heater - Wikipedia

   en.wikipedia.org/wiki/Gas_heater

   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 non-flued, or vented and unvented .

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. Patio heater - Wikipedia

   en.wikipedia.org/wiki/Patio_heater

   The below table correlates to the approximate power (BTU / Watts) required. Results may vary based on the outside temperature, obstructions and wind. Area Distance from heater Propane and natural gas heaters Electric heaters 4 sq ft 1 foot 10,000 BTUs 1,000 Watts 16 sq ft 2 feet 36 sq ft 3 feet 64 sq ft 4 feet 100 sq ft 5 feet 46,000 BTUs 144 sq ft

5. Direct vent fireplace - Wikipedia

   en.wikipedia.org/wiki/Direct_vent_fireplace

   The first key component within the outer housing is the firebox, which is surrounded on five sides by the outer housing, and on one side by the glass panel that faces towards the room. This is the space in which the fire burns during operation. Because of this, the gas burners (either natural gas or propane) are located inside of the firebox ...

6. Gasoline gallon equivalent - Wikipedia

   en.wikipedia.org/wiki/Gasoline_gallon_equivalent

   One GGE of natural gas is 126.67 cubic feet (3.587 m 3) at standard conditions. This volume of natural gas has the same energy content as one US gallon of gasoline (based on lower heating values: 900 BTU/cu ft (9.3 kWh/m 3) of natural gas and 114,000 BTU/US gal (8.8 kWh/L) for gasoline). [22]

7. Flue gas - Wikipedia

   en.wikipedia.org/wiki/Flue_gas

   Exhaust flue gas generated by combustion of fossil fuels (In SI metric units and in US customary units) Combustion data Fuel gas Fuel oil Coal; Fuel properties: Gross caloric value, MJ/m 3: 43.01 Gross heating value, Btu/scf 1,093 Gross caloric value, MJ/kg 43.50 Gross heating value, Btu/gal : 150,000 Gross caloric value, MJ/kg 25.92