Pentair 474989 thermal regulator for MasterTemp Model 125 heater water systemPentair Thermal Regulator for MasterTemp 125 Heater Water System, 474989 In stock$6199
Pentair 474989 thermal regulator for MasterTemp Model 125 heater water system
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Pentair Thermal Regulator for MasterTemp 125 Heater Water System, 474989

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$6199
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Quick overview

  • Genuine Pentair Factory part 474989 for the MasterTemp water system.
  • Model 125 specific Sold for the MasterTemp Model 125, not the larger MasterTemp sizes.
  • Water system part Fits into the heater water path where the original regulator sits.
  • Direct replacement Goes in place of the existing regulator with no adaptation.
  • Protects the heat exchanger The regulator manages heater water flow, which is what keeps the exchanger out of trouble.
  • Match the model Pentair uses different regulators across the MasterTemp and Max-E-Therm range, so confirm yours is the 125.
Full description and specifications ↓

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Product details

The Pentair 474989 is the thermal regulator for the MasterTemp Model 125 heater water system. It is the genuine Pentair replacement for the regulator fitted at the factory.

Where it sits

The regulator lives in the heater water path. It manages how water moves through the unit, which is what keeps the heat exchanger working within its design range instead of taking the full brunt of whatever the pump sends it.

Getting the right one

Pentair uses more than one regulator across the MasterTemp and Max-E-Therm families. This one is listed for the MasterTemp Model 125. Confirm the part number on the regulator you are pulling out before ordering, since the wrong size will not seat correctly.

Specifications
Brand Pentair
Manufacturer part number 474989
UPC 788379865252
Type Thermal regulator
Fits Pentair MasterTemp Model 125 heater water system
Sold as Single replacement regulator
Shipping weight 0.75 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which heater does this fit?
The Pentair MasterTemp Model 125 heater water system. Part number 474989.
Will it fit a larger MasterTemp?
This listing is specific to the Model 125. Pentair uses different regulators across the MasterTemp and Max-E-Therm range, so check the part number on your heater.
Is it a genuine Pentair part?
Yes. It is the Pentair OEM regulator, part 474989.
What does a thermal regulator do?
It sits in the heater water path and manages flow through the unit. When it fails, the heater no longer controls water temperature through the exchanger the way it was designed to.
Ask your own question