If your home is serviced by an underground water main, just run a tap a minute to learn what the temp is at that depth.
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Originally Posted by DDogg
interested in an affordable "on demand" solution, triggered by inlet or outlet temp, that could be spliced
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Periodically cycle water from a buried reservoir through a case reservoir? A relay could switch a utility pump located in the pit. The (big cheap noisy) pump would only stay on long enough to refresh the loop. This solution will cost your household the least kilowatt hours but may break your back to set up. Personally, I think the long-term energy savings is worth it. A welcome bonus: this powerful secondary pump could run through a very restrictive filter.