Pentair Manifold Internals | MasterTemp & Max-E-Therm 400K BTU Heaters | 77707-0209

Description

The Pentair 77707-0209 is the replacement manifold internals assembly for the Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters rated up to 400,000 BTU.

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 internals are a core combustion-side assembly within the MasterTemp and Max-E-Therm heater cabinet. When these components degrade or fail, the heater’s ability to distribute gas flow and sustain proper combustion is compromised, resulting in ignition failures, uneven heating, or heater lockout. Replacing with the correct internals restores the original gas flow geometry and heat performance to factory specification.

Specifications

Poolaroo Pro Tip

When servicing manifold internals, have your heater’s model and serial number on hand before ordering — the 400K BTU rating is a shared specification across both the MasterTemp and Max-E-Therm lines, but always cross-reference the part number printed on the original component or listed in your heater’s service manual to confirm this is the correct assembly for your specific unit. This service must be completed by a licensed pool or HVAC technician.