exchemist
Veteran Member
Depends what you mean by efficiency. Both burn essentially 100% to CO2 and water, so no difference in combustion efficiency. It's true that methane gives out less heat per unit volume of gas (at the same pressure). So methane needs fatter pipes. But per unit mass they are almost the same. And propane is worse than methane for CO2 emission, as it has more carbon and less hydrogen in its molecules. (Ratio of water: CO2 is 2:1 for methane but 4:3 for propane.)Propane is twice as energy efficient as natural gas which I think is why some claim its the cleanest fossil fuel.
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