Hi all, Looking into options for DHW for my cabin on an off-grid island on the BC coast. There is some electricity but not enough to run an electric tank. Currently the hot water is made by a coil in the oil stove which heats an indirect tank. See pics in this thread: http://www.hearth.com/talk/threads/can-i-convert-this-oil-stove-into-an-efficient-wood-stove.94600/ VERY inefficient, expensive, and packing stove oil in the boat is a pain. I was thinking of hooking up a propane on-demand heater in addition to the indirect tank. Long-term (when the indirect tank needs replacing) it would be nice to have solar hot water feeding the tank too. I've read on here some pretty positive reviews to on-demand hot water heaters, but I don't know how they would do with the incoming water being pre-heated - none of the manufacturers seem to encourage this and I don't know why. Does anyone have any experience with this sort of system? Also, how reliable are they? I don't want to have a maintenance headache with some fancy hot water heater that I can't fix myself. We have very soft water though, which I think is good.