coiled copper tube sheet coil assembly with attached metal plate alongside set of black rubber O-rings and tube of high temperature RTV silicone sealant
tube of red high temperature silicone adhesive sealant in plastic packaging with ten black rubber O-rings arranged beside it
Coiled copper tube assembly with a rectangular metal mounting plate featuring multiple copper connectors for pool and spa heater
coiled copper tube sheet coil assembly with attached metal plate alongside set of black rubber O-rings and tube of high temperature RTV silicone sealant
tube of red high temperature silicone adhesive sealant in plastic packaging with ten black rubber O-rings arranged beside it
Coiled copper tube assembly with a rectangular metal mounting plate featuring multiple copper connectors for pool and spa heater
Pentair Pool Products and Parts

Pentair Tube Sheet Coil Assembly Replacement Kit | MasterTemp & Max-E-Therm 400 | 77707-0234

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$1,342.99
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SKU:
77707-0234

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About This Item

The Pentair Tube Sheet Coil Assembly Replacement Kit (77707-0234) is the replacement heat exchanger assembly for the Pentair MasterTemp 400 and Pentair Sta-Rite Max-E-Therm 400 pool and spa heaters.

IMPORTANT: HEATER COMPONENT — PROFESSIONAL SERVICE 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.

This kit services the heat exchanger core of the MasterTemp 400NA, 400LP, and Max-E-Therm 400 heaters. It includes the 400,000 BTU tube sheet coil assembly and the coil tubesheet sealing O-ring kit, providing all primary components needed for a complete heat exchanger service.

Specifications

Pentair Part Number 77707-0234
BTU Rating 400,000 BTU
Kit Contents Tube sheet coil assembly; coil tubesheet sealing O-ring kit
Compatible Fuel Types Natural Gas (NA); Liquid Propane (LP)
Compatible Equipment Pentair MasterTemp 400NA, 400LP; Pentair Sta-Rite Max-E-Therm 400

Poolaroo Pro Tip

The tube sheet coil assembly is a primary heat transfer component — scale buildup and corrosion from improper water chemistry are the leading causes of premature failure. Before installing this replacement kit, verify that your pool water's pH (7.4–7.6), total alkalinity (80–120 ppm), and calcium hardness (200–400 ppm) are within range. Heater manufacturers recommend balancing water chemistry before returning the heater to service after any heat exchanger repair. This service must be completed by a licensed pool professional or qualified 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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