Product Overview

The Pentair 42001-0107S Transformer is a genuine replacement dual-voltage transformer kit for Pentair MasterTemp® and Sta-Rite Max-E-Therm® pool and spa heaters. It converts 115V or 230V supply power to the correct operating voltage for the heater's control board, supporting safe, reliable heater operation. Built to Pentair's specifications, this OEM component restores heater function after a transformer failure.

Ideal for technicians and pool owners performing maintenance or electrical repairs on compatible Pentair heating systems.

Ideal For

Replacing a failed transformer in a Pentair MasterTemp or Sta-Rite Max-E-Therm heater

Heaters showing no display or control power because of a transformer fault

Pool service technicians performing heater electrical repairs

Key Features

Genuine Pentair OEM part: direct replacement under part number 42001-0107S.

Dual voltage: 115/230V input.

Kit format: supplied as a transformer kit for the heater electrical system.

Specifications

Warranty & Compatibility

Compatibility Notes

Designed for the electrical systems of Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. Confirm your heater model and serial number from the data plate before ordering.

Installation Notes

Turn off and lock out all power to the heater before servicing. Confirm the heater's supply voltage (115V or 230V) and wire the transformer according to the heater's wiring diagram. Installation should be performed by a qualified technician.

Customer-Facing Q&A

Q: What is the part number?
A: The Pentair part number is 42001-0107S.

Q: What is the UPC?
A: The UPC is 022315315051.

Q: Which heaters does it fit?
A: It is designed for Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters.

Q: Does it work with 115V and 230V heaters?
A: Yes. It is a dual-voltage 115/230V transformer; wire it to match your heater's supply voltage.