Propane weighs 4.2 lbs./gal.
30# tank holds a little over 7 gal.
30 gal. tank, also called a 100# tank, filled to 80%(industry standard) holds 24 gal. Those are the tall skinny ones at homes for cooking or at seasonal sites for whole trailer.
Just to clarify for those comparing usage.
Also the gas line feeding the water heater needs to be larger to allow enough volume of gas to flow at the specified pressure.
Hope that helps...Jim
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'02 Chaparral 281BHS....sold
'12 Cougar 327RES....new
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