Demand (Tankless) Water Heater with Thermostatic Shower Control
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Why are you going to all of this trouble as most taps are pressure
balanced and will keep within 2.2 degrees of set temp
that would be true if the supply temps were always the same, which they
never are. The cold water gets colder, the hot gets cooler, temp drifts
down. Only a thermostatic valve would be even close.
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