The HeatGuard(r) 100 thermostatic mixing valve is an ASSE1017-approved device that can improve safety and increase the effective amount of hot water. When installed at the water heater, the HeatGuard 100 acts as a master thermostatic mixing valve that allows water stored at 140 degrees F to be delivered at 120 degrees F throughout the building, complying with UPC section 420.0.

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