Product Overview

The Pentair 42001-0105S is a genuine OEM voltage selector plug kit for the electrical system of Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. These heaters can run on either 120V or 240V supply power, and the voltage selector plug tells the heater's transformer which supply it's connected to. The kit includes both the 120V and 240V plugs so you can replace a lost or damaged plug or set the heater up for the correct supply voltage.

⚠️ Important Purchase Notice

This is a heater electrical component. Installing the wrong plug for your supply voltage can damage the heater. Turn off power before service, and have a qualified technician or electrician confirm the supply voltage and install the correct plug following Pentair's instructions. Inspect the shipment upon arrival and report damage promptly.

WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.

Ideal For

• Replacing a missing or damaged voltage selector plug on a MasterTemp or Max-E-Therm heater.
• Setting up a heater for 120V or 240V supply power.
• Pool heater service technicians and electricians.

Key Features

• Genuine Pentair OEM part, number 42001-0105S.
• Includes both 120V and 240V selector plugs.
• Clearly marked plugs with pre-wired leads.
• Fits the MasterTemp and Max-E-Therm heater electrical system.

Benefits

• Matches the heater's transformer to your supply voltage.
• Restores proper heater power-up and operation.
• OEM fit for a simple plug-in replacement.

Compatibility

For the electrical system of Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. Confirm your heater model and the part number in its parts list before ordering.

Installation or Upgrade Context

Turn off power to the heater at the breaker. Open the electrical compartment, confirm the supply voltage, and connect the matching 120V or 240V plug at the voltage selector connection following Pentair's wiring diagram. Close the compartment, restore power and confirm the heater powers up correctly.

What’s Included

• One 120V voltage selector plug
• One 240V voltage selector plug

Specifications

Warranty

Covered by a 60-day manufacturer warranty, subject to Pentair’s applicable terms. Contact Pentair for warranty claim instructions; Pool Supply Depot can provide proof of purchase.

Customer Q&A

Which heaters does this fit?

Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters.

Does the kit include both plugs?

Yes. Both the 120V and 240V plugs are included.

Which plug do I need?

Use the plug that matches your heater's supply voltage. Have a qualified technician confirm it before installing.