Pentair MasterTemp 300 & Max-E-Therm 333 Manifold Kit | 77707-0015

Description

The Pentair Manifold Kit (77707-0015) is the OEM replacement manifold assembly for the MasterTemp 300 (NA and LP) and Max-E-Therm 333 gas pool heaters.

⚠️ IMPORTANT: THIS IS A KIT — NOT A SINGLE COMPONENT
This listing is a complete manifold kit, not an individual manifold body. The kit includes multiple components (see Specifications). One kit services one heater.

⚠️ IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED
Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.

The manifold is the central water-circuit assembly of the MasterTemp and Max-E-Therm heater — routing pool water through the heat exchanger while integrating the ignition and blower sealing points. A failed manifold can cause internal leaks, erratic ignition, or combustion gas intrusion into the water system. This kit restores full OEM specification with a direct-fit replacement designed specifically for the 300,000 BTU MasterTemp and 333,000 BTU Max-E-Therm heater platforms.

Specifications

Fits Into

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment’s manual or on the original part itself before ordering.

Pro Tip

Before ordering, confirm the part number stamped on your existing manifold assembly matches 77707-0015. MasterTemp and Max-E-Therm heaters span multiple BTU ratings and model revisions — the 300 and 333 BTU class models use this specific kit; other sizes use different manifold part numbers. If your heater was originally branded Sta-Rite (Max-E-Therm), this remains the correct current Pentair OEM replacement. Always reference your heater’s serial number and the exploded parts diagram in your service manual to confirm fitment before installation.