Product Overview

The Pentair MasterTemp & Sta-Rite Max-E-Therm 400K BTU Propane to Natural Gas Conversion Kit | 77707-1411 is a genuine Pentair replacement conversion kit designed for converting compatible 400,000 BTU pool and spa heater burner systems from propane / LP gas to natural gas / NG operation. It is used with select Pentair MasterTemp 400K and Sta-Rite Max-E-Therm 400K heaters where the correct fuel conversion components are required for safe, proper combustion setup.

This kit is intended for professional installation. Gas conversions should be completed by a qualified pool heater technician or licensed gas professional to ensure proper fuel type, orifice configuration, gas pressure, combustion adjustment, labeling, and local code compliance.

Ideal For

Pool owners, service technicians, and repair professionals converting a compatible 400K BTU Pentair MasterTemp or Sta-Rite Max-E-Therm propane heater to operate on natural gas, when matched by heater model, BTU rating, serial/date requirements, and part number.

Key Features

Propane to Natural Gas Conversion: Designed to support conversion from LP / propane to NG / natural gas on compatible 400K BTU heater burner systems.

Compatible with 400K BTU Heater Models: Fits select Pentair MasterTemp 400K and Sta-Rite Max-E-Therm 400K pool and spa heaters. Some listings specify use with heaters built after 11/14/2005 and serial numbers after L3001I05K001, so model and serial verification is recommended before ordering.

OEM Pentair Replacement Kit: Manufactured for Pentair / Sta-Rite heater systems, helping ensure correct fitment when replacing or converting the specified burner system components.

Includes Required Conversion Components: Reported kit components include a clamp assembly, O-ring, and silicone tube for the applicable burner system conversion.

Service-Focused Repair Part: Best suited for trained installers performing heater service, gas-type changes, or burner system configuration work.

Benefits

This conversion kit allows compatible 400K BTU heaters originally configured for propane to be adapted for natural gas service when a natural gas supply is available. Using the correct OEM-matched kit helps support reliable heater operation, proper combustion setup, and correct component fitment. For customers with access to natural gas, conversion may also reduce the need for propane tank refills and simplify long-term fuel supply.

Specifications

Customer-Facing Q&A

Q: What does this conversion kit do?
A: This kit is used to convert compatible 400K BTU Pentair MasterTemp and Sta-Rite Max-E-Therm heaters from propane / LP gas to natural gas / NG operation.

Q: Will this work on all MasterTemp and Max-E-Therm heaters?
A: No. This kit is for select 400K BTU models only. Heater model, BTU size, fuel type, and serial/date requirements should be confirmed before purchase.

Q: Can I install this conversion kit myself?
A: Gas conversions should be handled by a qualified pool heater technician or licensed gas professional. Proper gas pressure, combustion setup, and safety checks are required.

Q: Does this convert natural gas to propane?
A: No. This part is listed as a propane / LP to natural gas / NG conversion kit for compatible 400K BTU heaters.

Q: Is this an OEM Pentair part?
A: Yes, this is listed as a Pentair / Sta-Rite replacement conversion kit under part number 77707-1411.