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August 2, 2014 at 12:00 am #68378
We use one of these. (And have a spare for less than $250) Plenty of heating flow for a shower. (1.5L) Ignition and safety controls use 2-“D” cells. Burner isn’t any bigger in BTU’s than a standard propane oven so no need to vent outside. Just add batteries and propane..
2 quality “D” cells will last for over a year. I use a standard grill propane tank/regulator system for the propane supply. 2-3 showers/day and the tank will last ~3 months. No need to impose on the solar system..