If you are going that route, I suggest you check out the Eccotemp L5. I looked at the zodi and even the dual burner zodi. The setup basically involves heating up the bucket of water first, then using it. The zodi doesn't turn on and off with the flow like an eccotemp and it has very weak flow and preassure, so you need something different to actually wash yourself very well.I've done a soapy washcloth and a bucket of water. I've bathed in the 50° mountain river. I've had 5 gallons of water and a rechargeable sprayer. Now my Zodi will be here later this week. Best price I found was $138 on eBay.
Get a good 12v pump, 50 psi with a couple gpm flow (you can reduce the flow rate from there).
The setup I am working on now uses one. I will make a thread with details once I have the kinks worked out.