When you first buy a solar water heater it will state that it's hooked up and working. After one use (or after the sun goes down) It will never recharge again, and you'll always have cold water. I ...
Ideas
I believe I am having the same or a similar issue. I never have hot water on my Off-the-Grid lot. I have a save file where I am living on the Admiral's Wreckage lot in Sulani that came with Island Living. Even when there is a surplus of water I can't take a normal shower or bath. I can only take a cold shower/bath or a quick & tepid shower/bath if the appliance works off-the-grid. I added the solar water heater from For Rent and it worked for probably one day before I no longer had hot water. I also have the hot water heater from the Restoration Workshop Kit to see if that would help but it didn't.
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