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Solar DHW tank with gas backup?
I've never understood the idea of solar DHW tanks having electric backup, as a large portion of the solar guys are off-grid and may not have that electricity available. I have a bit of a mess coming up here, guy wants to integrate solar thermal with an outdoor wood boiler and have a gas backup to heat his new shop (radiant slab). The collectors are making enough heat to require approximately 140 gallons of storage for full utilization, but cost is a factor as well so at this point we're looking at a 120 gallon solar DHW tank with the single 4500W element (4.5kw will cover his heat load if need be). He really hates the idea of the electric backup, but hates the cost of a storage tank and LP boiler even more. Why does nobody make a solar tank with a gas backup? Or maybe they do and I can't find one. Pointers?