Compare to the cost of propane and natural gas, and a uniform unit is needed. However, BTU or British thermal unit is a convenient unit to measure the amount of energy both of the gases possess. According to the British Thermal Unit, one cubic foot of propane gas equals 2516 BTUs, and one cubic foot of natural gas equals 1030 BTUs. That means, a 100000 BTU natural gas furnace can burn 97 cubic feet of natural gas in 1 hour. Again, a propane furnace can heat 40 cubic feet of propane gas per hour.
Therefore, propane supplies more than twice the energy of natural gas, which indicates the higher efficiency of the propane furnace as a source of heat. The energy content of LPG or propane gas is higher than natural gas. Out of per cubic meter of propane gas, 93.2 MJ of energy is produced. Natural gas produces 38.7 MJ of energy per cubic meter.
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