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We've got a 4kw array and decent batteries but for the tankless heater it's the 500 gallon propane tank.

This is an offgrid home, we've got an 80 gallon hybrid electric with a heat pump (the big elements will never turn on). Our plumber recommends putting an instant heater after it to assist if we run out of hot water either from usage or not enough hot water from cloudy days. I've heard only some...

I'm getting a new well drilled (~400'), we're in a cold area that has ~3 foot frost depths. I've already purchased a 2,500 gallon cistern but I'm concerned that I wasted my money a bit because (a) managing freezing temperatures with it will be difficult and (b) it's really a rainwater cistern so...