Your math is a little off on the propane consumption. You are correct at 21600 btu per pound, which means your unit will burn about 2.8# of propane per hour. So a ten minute shower (if you had one) would use about a half pound of propane. Keep in mind that large a burner should really be on a larger tank like a 30# or 40# cylinder. It will work fine when full, but when you get lower like 1/4 tank or so that little tank can't produce vapor fast enough for a large burner. For your minimal usage, you shouldn't have a problem. Also, for safety, make sure you use the correct vent assembly for the make/model/size of your unit, do not homebuild a vent.
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