Caleffi HydroMixer thermostatic fixed temperature mixing unit, Alpha 25-55U
The 166 series HydroMixer™ provides a fixed temperature flow to low temperature secondary heating circuits (such as floor radiant panels), complete with onboard three-speed or variable-speed pump, thermostatic three-way mixing valve with built-in temperature sensor, check valve, supply and return temperature gauges, secondary circuit shut-off ball valves and pre-formed insulation shell. Versions are available with either the three-speed Grundfos UPS 15-58 pump or the variable-speed Alpha 25-55U pump. The unit can be ordered with supply flow and pump on the right or left side, and the unit is field reversible to accommodate changing installation requirements. The adjustable differential pressure by-pass valve, code 519600 and wall bracket code 165001 are optional. The unit comes with male union connections which require separately purchased, 1 inch sweat or NPT, top outlet and bottom inlet fitting kits.
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