Taco 5101-G3 geothermal valve replaces 5101-G2. Taco 5101-G3 geothermal valve (3/4" threaded) is designed to control open type geothermal systems with high head. The unique end switch design of Taco geothermal valves allows to control of the heat pump from the valve. This allows movement of cold water into the coil before the heat pump actually starts.
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