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Old 01-22-20, 01:07 AM   #9
u3b3rg33k
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Join Date: Mar 2018
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if you're using a preheat tank with an HX, use the tank water as part of your thermal system, and the HX for potable water, instead of the other way around. that way you don't have 40 gallons of warm-ish water sitting there. it will likely have a small efficiency penalty, but if set up correctly that can be minimized (obviously doesn't work with an internal HX at the bottom only).
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