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We can calculate that out.
If you only have to heat the water 60 degrees that's 510 btu per gallon. 20lb of propane should heat nearly 600 gallons of hot water per 20lb tank at 75% efficiency.
I'm a bit of a propane pro. Don't use 20lb tanks. It typically costs around $20 to fill a 20lb tank, but it will usually cost around $30 to fill a 40lb tank. But a 40lb tank weights over 80lb when full.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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