Taco 555-173RP is a Replacement power head for Taco Geothermal Series zone valves.
Taco 555-173RP is specially designed for high head, open system zone control. The unique end switch design permits control of the heat pump by the valve allowing movement of cold water into the coil before the heat pump starts. Reliable built-in Heat Motor, wax filled element and microprocessor-based actuator tab provide unmatched flow control and improve comfort and energy efficiency. Taco 555-173RP boasts both quiet and dependable operation. Manual open lever with twist-off head makes installation easy.