black rectangular plastic manifold internal part with multiple circular openings and mounting holes on a white background
black rectangular plastic manifold internal component with gasket and multiple circular holes visible from the side next to hinged panel
black plastic manifold internal parts with multiple circular seals and gasket for a heater system
black rectangular plastic manifold internal part with various compartments and circular protrusions on the side
black plastic manifold internal component with multiple rounded openings and mounting holes around the edges
black rubber-based manifold internal gasket with multiple holes and indents for heater assembly
black rectangular plastic manifold internal part with multiple circular openings and mounting holes on a white background
black rectangular plastic manifold internal component with gasket and multiple circular holes visible from the side next to hinged panel
black plastic manifold internal parts with multiple circular seals and gasket for a heater system
black rectangular plastic manifold internal part with various compartments and circular protrusions on the side
black plastic manifold internal component with multiple rounded openings and mounting holes around the edges
black rubber-based manifold internal gasket with multiple holes and indents for heater assembly
Pentair Pool Products and Parts

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

$130.99
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SKU:
77707-0209

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About This Item

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

Pentair Part Number 77707-0209
Compatible Equipment Pentair MasterTemp, Sta-Rite Max-E-Therm
Maximum BTU Rating 400,000 BTU
Also Known As / Legacy Part Reference Sta-Rite Max-E-Therm (Pentair legacy brand)

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.

CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals which are 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.
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Pentair Pool Products and Parts

About Pentair Pool Products and Parts

Pentair is often considered the "gold standard" for pool professionals, and for good reason. Founded in 1966 (originally by five inventors making high-altitude balloons!), the company has evolved into the global leader in smart, sustainable water solutions. For the DIY homeowner, Pentair represents the intersection of rugged durability and silicon valley-tier technology. They pioneered the Variable Speed Pump revolution with the IntelliFlo®, saving American pool owners millions in energy costs. Today, their ecosystem focuses heavily on automation, allowing you to control your pump, heater, lights, and chemistry from a single app. While they are a favorite among professional builders, their "EC" (E-Commerce) line of equipment allows homeowners to access pro-grade technology with valid warranties for DIY installation.

Why We Trust Pentair Pool Products and Parts
Energy Efficiency Leaders: Recipient of the ENERGY STAR® Partner of the Year award for over a decade; their pumps are designed to pay for themselves in energy savings.

Smart Automation: The Pentair Home App and IntelliCenter systems offer best-in-class control over your pool ecosystem from anywhere in the world.

Professional Pedigree: The brand most often recommended and installed by pool builders for high-end residential pools.

Eco-Conscious: Dedicated to reducing water waste and energy consumption through "Green" technology innovations.

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