07-16-2020, 01:00 AM
I have the regular circulating pump, not the DC variety, however it is powered by solar via an inverter. IMHO 125 degrees is not hot enough for a solar hot water system on the East side where we have to go several days without any sun and you'll run out of hot water unless you either get a crazy large expensive tank or store water at a higher temp. As far as I know there is no limit to how hot our water can get up to the point it would set off the pressure relief valve. I usually set it at about 140 though I have turned it up to as high as 160 when we need to scald turkeys in the utility sink. The higher the temperature the shorter the life of the tank. Ideally when we have sun every day I should set it at about 130 and crank it up when we have weather patterns of little sun but I'm more of a set-it-and-forget-it guy.