Product Overview

Restore a compatible Pentair MasterTemp or Sta-Rite Max-E-Therm heater with the 77707-0232 tube sheet coil assembly kit. The tube sheet coil is the heater’s heat exchanger core: pool water flows through the coil and absorbs heat generated by the burner. This replacement is intended for select natural gas and propane 175,000 and 200,000 BTU heaters manufactured before January 12, 2009.

A leaking or deteriorated heat exchanger can interrupt heating and may require replacement of the coil assembly. Because Pentair changed the heater tub design in 2009, the manufacture date is essential when selecting this part. Confirm the heater’s model, serial information, and existing combustion chamber design before ordering.

Key Features

• Genuine Pentair tube sheet coil assembly kit
• Part number 77707-0232
• For select original-design MasterTemp and Max-E-Therm heaters
• Fits listed natural gas (NA) and liquid propane (LP) models
• Includes the coil/tube sheet sealing O-ring components specified with the assembly
• Provides a replacement heat exchanger core without purchasing a complete heater

Compatibility & Specifications

Ordering note: Pentair lists 474058 for the later-design 175/200 MasterTemp and 200 Max-E-Therm heaters manufactured after the January 2009 change. Part 77707-0232 should not be selected by BTU rating alone.

Installation & Repair Context

Heat exchanger replacement requires disassembly of the heater’s water and combustion systems. A qualified pool heater technician should confirm that the coil is the source of the problem, inspect the manifold and surrounding components, and follow Pentair’s service instructions for the heater’s production date.

The technician should also investigate the cause of a failed coil. Water chemistry, flow issues, freeze damage, or an existing leak can affect the service life of the replacement. All water and gas connections, seals, and heater operation should be checked before returning the unit to service.

Frequently Asked Questions

Does this fit a 200NA and 200LP heater?
Yes, when the heater is a compatible pre–January 12, 2009 MasterTemp or Max-E-Therm model.

Does it fit a MasterTemp 175?
Pentair also lists 77707-0232 for the pre-2009 MasterTemp 175NA and 175LP models.

Will it fit a heater built after January 12, 2009?
The later-design 175/200 coil kit is 474058. Confirm the manufacture date and heater design before purchasing.

Is this a complete heater?
No. It is a replacement tube sheet coil assembly kit for servicing an existing heater.