Ok Dave, I must say that old link has given me pause. Folks, I have a 16 gallon water tank and I have propane, solar and a Prosine inverter. I'm starting from scratch, so please chime in with what you think is the best solution for hot water in a SMB. I have a Zodi and its ok in a pinch, but would rather have a more permenant solution for supplying hot water. Perhaps one of those pricey 120 volt marine jobbies with a heat exchanger like this?
I'd rather not sawzall the body for your usual propane water heater (Suburban, Atwater, etc), but I can if I must. Thanks.