Pentair Thermal Regulator | MasterTemp | 474989
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- In stock, ready to ship
- SKU:
- 474989
-
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About This Item
The Pentair Thermal Regulator (474989) is the OEM replacement thermal regulator for the Pentair MasterTemp 125 pool heater.
IMPORTANT: HEATER COMPONENTS — PROFESSIONAL SERVICE REQUIRED
Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.
The thermal regulator maintains the MasterTemp 125's operating temperature within its designed range, protecting the heat exchanger and burner assembly from thermal stress caused by insufficient flow or abnormal temperature conditions. A failed thermal regulator can result in erratic water temperature, nuisance shutdowns, or heater lockout.
Specifications
| Pentair Part Number | 474989 |
| Part Name | Thermal Regulator |
| Quantity Included | 1 (Each) |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | MasterTemp | MasterTemp 125 | — |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.
Poolaroo Pro Tip
Before replacing the thermal regulator, verify that the MasterTemp 125's water flow rate meets the heater's minimum flow requirement. A thermal regulator that fails prematurely is often the result of chronically low flow — replacing the part without addressing the root cause will result in repeat failure. Have a licensed pool technician confirm flow rate and system pressure before placing the heater back in service.
