Product Overview

Bring your heater back to proper water flow and safety operation with the Pentair 77707-0016 Manifold Kit (400K BTU). This genuine replacement manifold conversion kit is made for Pentair MasterTemp® 400 and Sta-Rite® Max-E-Therm® 400 heaters and is used when the manifold assembly or related safety components need replacement.

Ideal For

• Replacing a leaking, cracked, or worn manifold assembly on a 400K BTU heater

• Fixing heater issues tied to the manifold-side components (water pressure/safety sensor faults, bypass issues, etc.)

• Service pros performing a proper OEM manifold replacement on MasterTemp/Max-E-Therm 400 models

Key Features

• Genuine Pentair / Sta-Rite replacement kit

• Part Number: 77707-0016

• Built for 400K BTU heater applications

• Designed as a manifold conversion kit that includes key safety and manifold-side components used during replacement

Compatibility

• Pentair MasterTemp® 400 (commonly listed for 400NA / 400LP models)

• Sta-Rite Max-E-Therm® 400 (commonly listed for SR400NA / SR400LP models)

Always confirm your heater model and part number before ordering.

What’s Included (Kit Contents)

Common kit contents include:

• Coil / tubesheet sealing O-ring kit

• Manifold O-ring

• Water pressure switch

• Connector tube kit (with O-ring)

• Zinc plug

• Safety components commonly supplied with this kit such as AGS (automatic gas shutoff) switch, high limit switch, and thermistor

Note: The thermal regulator assembly is typically purchased separately, and the kit does not include the relief valve.

Benefits

• Restores reliable heater operation without replacing the entire heater

• OEM-fit components for a proper seal and correct sensor/safety integration

• Helps eliminate common manifold-related leaks and faults when the manifold assembly is the root cause

Installation Notes

• Turn off power and shut off gas supply before service.

• Installation is best handled by a qualified pool/spa service professional.

• Inspect mating surfaces and replace seals/O-rings correctly to prevent leaks.

Customer-Facing Q&A

Q: What does the manifold kit do?
A: The manifold is the water connection “hub” on the heater. This kit replaces the manifold assembly and key related components used for water flow and safety sensing.

Q: Which heaters does 77707-0016 fit?
A: It’s for MasterTemp 400 and Max-E-Therm 400 applications (commonly 400NA/400LP and SR400NA/SR400LP).

Q: Does this include the thermal regulator?
A: Usually no—the thermal regulator assembly is commonly sold separately.

Q: Is this a complete heater rebuild kit?
A: No—this is a manifold conversion kit (manifold-side assembly + related components). It’s intended for manifold replacement, not a full heater overhaul.