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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. Patio heater - Wikipedia

   en.wikipedia.org/wiki/Patio_heater

   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 6 feet 1,500 Watts 196 sq ft 7 feet 256 sq ft 8 feet 324 sq ft 9 feet Requires additional heater 400 sq ft 10 feet Requires additional heater

4. Propane - Wikipedia

   en.wikipedia.org/wiki/Propane

   A 20 lb (9.1 kg) steel propane cylinder.This cylinder is fitted with an overfill prevention device (OPD) valve, as evidenced by the trilobular handwheel. Propane (/ ˈ p r oʊ p eɪ n /) is a three-carbon alkane with the molecular formula C 3 H 8.

5. Thermal efficiency - Wikipedia

   en.wikipedia.org/wiki/Thermal_efficiency

   An electric resistance heater has a thermal efficiency close to 100%. [8] When comparing heating units, such as a highly efficient electric resistance heater to an 80% efficient natural gas-fuelled furnace, an economic analysis is needed to determine the most cost-effective choice.

6. Coefficient of performance - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_performance

   Reducing the output temperature to around 30 °C (86 °F) which requires piped floor, wall or ceiling heating, or oversized water to air heaters. Increasing the input temperature (e.g. by using an oversized ground source or by access to a solar-assisted thermal bank [ 10 ] ).

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8. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   This calculation is called a heat loss calculation and can be done with a BTU Calculator. Depending on the outcome of this calculation, the heater can be exactly matched to the house. [ 19 ] [ 20 ] [ 21 ]

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