Hey guys thanks for your help! My wife and I just moved off grid about a month ago and we are just getting things going. Right now we have no hot water, which is not that bad because it is summer. We have very limited power and don't want to have to use propane to heat our water. I have looked into making a solar water heater, but before I did so I was curious if anyone had any experience with these in the winter. I am not sure if they work all that well (or at all) when it gets below freezing outside. It would be great help if anyone can point me in the direction of a design of one that works well in the winter or let me know if I am headed in the wrong direction all together with a solar water heater. Thanks again.