Product overview

Restore the gas control component in a compatible Pentair pool or spa heater with the genuine Pentair 42001-0051S Combination Gas Control Valve Kit. Pentair lists this part in the burner systems of MasterTemp and Sta-Rite Max-E-Therm heaters. It is a service replacement for a valve that a qualified technician has diagnosed as faulty.

The gas valve controls the supply of gas to the burner during the heater’s ignition and heating cycle. Because ignition problems can have several causes, confirm the diagnosis and match the part number to your heater before ordering.

Key features

• Genuine Pentair combination gas control valve kit
• Listed in Pentair’s MasterTemp and Max-E-Therm burner parts diagrams
• Replacement for heater repairs specifying part 42001-0051S
• Applicable to listed natural gas and propane heater configurations; fuel-specific components must be verified separately

Specifications and compatibility

Check your heater’s model, serial number, fuel type, and parts diagram before purchase. Do not assume this kit fits a MasterTemp 125 or a different Pentair heater family.

Repair and installation guidance

This valve is intended for a diagnosed gas control repair. A heater that fails to ignite may instead have a gas supply, igniter, control, wiring, or airflow issue. Replacing the valve without testing those components may not resolve the problem.

Gas valve replacement should be performed by a qualified heater service professional. The technician must shut off power and gas, install the specified replacement part, test connections for leaks, and verify gas pressures and heater operation under the applicable Pentair instructions and local codes.

This valve kit is not a natural gas-to-propane or propane-to-natural gas conversion kit. Pentair lists model- and fuel-specific orifice and conversion kits separately.

Frequently asked questions

Does 42001-0051S fit both MasterTemp and Max-E-Therm heaters?
Pentair lists it as a combination gas control valve kit in the burner parts diagrams for both heater families. Confirm the exact model and parts diagram for your unit.

Will replacing the valve fix an ignition failure?
Only if testing identifies the gas valve as the cause. Several other heater components and gas supply conditions can produce similar symptoms.

Can I use this kit to convert my heater to propane or natural gas?
No. Fuel conversion requires the correct Pentair conversion components for the specific heater model and professional setup.

Is this the correct part for a MasterTemp 125?
Do not order it for a MasterTemp 125 without checking that heater’s dedicated parts diagram.