Tankless water heater and butane use

[Fishing Dave]

I have propane 50 gallon water heater, gas stove and fireplace, and barbeque. Goes with a 500 gallon tank. We go through about 300 gallons a year, which is about the active usable volume for a 500 gallon tank. Most houses where I live have propane tanks, either one or two 125 gallon tanks. Dealers provide routine filling of tank on scheduled basis, not hard to get resupplied.