The most significant difference between propane and natural gas is that propane gas is HEAVIER than air. If propane gas leaks, it does not tend to vent safely into the air. Rather, it settles in low areas, both inside a structure or outside.
Alcohol stoves are the preferred method used in boats since it's fumes are lighter than air ALSO
Compressed Natural Gas
It's a very clean-burning fuel and burns hotter than alcohol. It also has an advantage over LPG in that it is lighter than air. So it is a much safer gas.
I have seen propane grills on pontoon boats which are on the main deck (only deck).
Mechanical connections should use an approved Teflon tape or pipe dope and tested with a simple leak detection soap solution which will bubble showing gas leak
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