I figured it would be trivial for me to use two of the 20lb bottles common for barbecue grills. Exchanging them is easy and i suspect a bottle will easily last a couple weekends, maybe more. Two minimizes inconvenience. After all, it's not like I'm living in this thing long term, it's just rather more than camping in a tent and cold water won't kill me. Especially during summer when it may well feel rather nice to bath in cold water anyway.
The instant heater isn't 12V so what are you using for mains AC?
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