The Caleffi 166612A is a HydroMixer thermostatic mixing unit with an Alpha high-efficiency pump in a pump left configuration, providing fixed-point temperature mixing for a low-temperature radiant zone.
Product data compiled from Caleffi North America technical documentation. Last reviewed July 2026.
FunctionMixing Unit
PumpAlpha (HE)
ConfigPump Left
Mix Temp80-125 °F
Warranty2 Years
Key Features
Thermostatic Temperature Mixing
Maintains a fixed supply temperature for a low-temperature radiant zone.
Integral Pump
Supplied with an Alpha high-efficiency circulator, pump left orientation.
Compact Zone Mixing
A complete mixing unit for adding a mixed low-temperature zone to an existing system.
Technical Data
| Function | Thermostatic mixing unit |
|---|---|
| Circulator pump | Alpha High-Efficiency Pump |
| Configuration | Pump Left |
| Maximum operating pressure | 145 psi |
| Adjustment temperature range | 80-125 °F |
| Electric supply | 115 V (AC) (AC) |
Documentation
Technical brochureRelated Products
Frequently Asked Questions
What is the Caleffi 166612A?
It is a HydroMixer thermostatic mixing unit with an integral pump that provides fixed-point temperature mixing for a low-temperature radiant zone.
What is the pump orientation?
This model is configured pump left.
2-Year Limited Warranty. Backed by Caleffi North America's limited warranty against defects in material and workmanship for two years from date of shipment. See Caleffi's limited warranty for full terms.
- Type:
- Mixing Unit
- Series:
- HydroMixer
- Pump Type:
- Alpha High-Efficiency Pump
- Configuration:
- Pump Left
