77707-0001 Pentair MasterTemp & Max-E-Therm Heater Manifold Bypass Valve

Maintain precise water flow control through your heater with the Pentair 77707-0001 Manifold Bypass Valve. Engineered as a direct-fit replacement for MasterTemp and Max-E-Therm heater lines, this valve governs how much water routes through the heat exchanger versus bypassing it, preventing excessive pressure and ensuring the heater fires and operates within its designed parameters. The valve body and internal components are fabricated from heat-tolerant, corrosion-resistant...

460749 Pentair Tube Sheet Coil Sealing O-Ring Kit | 8-Pack for MasterTemp 250 Heaters

Prevent leaks and protect your heater's integrity with the Pentair Coil Tubesheet Sealing O-Ring Kit (460749), purpose-built for MasterTemp 250 heaters. This 8-pack of precision-molded O-rings creates a watertight barrier at the tubesheet junction, safeguarding your heating system against moisture loss and pressure drops. Manufactured from resilient, heat-tolerant compounds, these seals hold up under the demanding thermal cycling of pool and spa heaters. Quick and...

Pentair MasterTemp & Max-E-Therm Water Pressure Switch — Part 42001-0060S

Safeguard your pool or spa heater with the genuine Pentair Water Pressure Switch, part number 42001-0060S. This factory-original safety sensor continuously monitors water pressure inside MasterTemp and Max-E-Therm heaters, verifying that adequate flow is present before allowing the burner to ignite. If pressure drops below the required level, the switch immediately shuts down the heating cycle to prevent dry firing and heat exchanger damage. Constructed...

38000-0007S Thermal Regulator by Pentair | MasterTemp & Max-E-Therm Heater Part

Restore proper temperature control to your pool or spa heater with the Pentair Thermal Regulator 38000-0007S, shipped with an included spring clip for quick installation. This factory-grade replacement component is precision-engineered to integrate directly into Pentair Sta-Rite Max-E-Therm pool and spa heaters, and it also works seamlessly with Pentair MasterTemp pool and spa heater models. By regulating the temperature output of your heating system, this...

Pentair MasterTemp & Max-E-Therm Heater Thermal Regulator 38000-0007S | Swimables SW-41-007

Restore precise heat control to your pool or spa with the Swimables Thermal Regulator SW-41-007, supplied with an integrated spring clip for straightforward installation. Purpose-built to fit Pentair Sta-Rite Max-E-Therm pool and spa heaters, this component also works seamlessly with Pentair MasterTemp units, giving you broad compatibility across popular heater lines. By governing the heat exchanger's output temperature, this regulator keeps your water at the...

77707-0010 Thermal Regulator Kit by Pentair | MasterTemp & Max-E-Therm Heater Service Kit

The Pentair Thermal Regulator Kit 77707-0010 delivers a complete temperature management solution for your pool or spa heater. Working in tandem with an internal bypass, the thermal regulator controls water flow through the heat exchanger to achieve and hold the proper outlet temperature. The heater's operator control panel board assembly sits atop the unit for convenient access. This all-inclusive kit is purpose-engineered for Pentair Sta-Rite...

Pentair MasterTemp & Max-E-Therm Thermal Regulator Kit 77707-0010 | Swimables SW-41-010

Inside every Pentair pool heater, a thermal regulator paired with an internal bypass governs water movement through the heat exchanger, keeping outlet temperatures exactly where they should be. The heater's operator control panel board assembly sits atop the unit for convenient access. This complete Swimables Thermal Regulator Kit is precision-engineered for Pentair Sta-Rite Max-E-Therm pool and spa heaters and also pairs perfectly with Pentair MasterTemp...

PKG188 Pentair 2" White Half Union Adapter Set of 2 for MasterTemp Heaters

The Sta-Rite Union Kit PKG-188 is a factory-quality replacement package featuring 2-inch union half-slip adapters engineered for pool and spa pumps, filters, and heaters. Each kit ships with two 2-inch slip tailpieces, two union nuts, and two union o-rings, giving you everything required for a secure, leak-free connection when servicing or replacing plumbing fittings on your pool or spa equipment. Key Benefits Direct-Fit Replacement: Functions...

Pentair MasterTemp & Max-E-Therm Heater Drain Plug With O-Ring | U178-920P | SW-41-178

Protect your pool heating investment with the Swimables SW-41-178 drain plug and O-ring set, purpose-built for Pentair MasterTemp and Sta-Rite Max-E-Therm gas heaters. This critical replacement component forms a robust, leak-proof barrier that prevents water from escaping the heater housing, safeguarding both system efficiency and operational safety. The accompanying O-ring amplifies sealing performance for added peace of mind. Widely trusted for its exact-fit engineering and...

77707-0120 Pentair MasterTemp & Max-E-Therm Heater Manifold O-Ring Kit

Restore watertight integrity to your heater's manifold assembly with the Pentair Manifold O-Ring Kit (77707-0120), purpose-built for MasterTemp and Max-E-Therm heating systems. This complete set supplies every O-ring needed to create a dependable, drip-free seal at the manifold junction, preserving peak heater performance. Each O-ring is manufactured from premium, chemically resistant compounds that hold up against continuous exposure to heated water and pool chemicals. Timely...

474989 Thermal Regulator by Pentair | MasterTemp 125 Pool Heater Replacement Part

Keep your pool or spa at the ideal temperature with the Pentair Thermal Regulator 474989, purpose-built for MasterTemp 125 heaters. This precision-engineered component governs water temperature with accuracy, safeguarding against overheating while delivering steady, comfortable warmth. Fabricated from premium-grade materials built to endure continuous use, this thermal regulator stands up to the demands of daily heater operation. Periodic inspection and timely replacement of this part...

474974 Pentair Union Kit 1.5" | MasterTemp 125 Pool Heater Plumbing Connection

Connect your MasterTemp 125 heater to your plumbing with confidence using the Pentair Union Kit (474974), featuring a 1.5" connection size. This all-in-one kit supplies every component needed to establish a tight, serviceable junction between your heater and the surrounding pipe network. Precision-engineered from sturdy, chemical-resistant materials, each piece is built to endure the heat and pressure demands of daily heater operation. The union-style design...

42001-0008S Pentair Sta-Rite Max-E-Therm Heater Display Cover

Safeguard your Sta-Rite Max-E-Therm Heater's control panel with the Pentair 42001-0008S Display Cover, a factory-original replacement component built to shield sensitive electronics from weather exposure and environmental wear. This cover preserves full readability of the heater's display while delivering dependable long-term protection against moisture, UV rays, and debris. Constructed from resilient materials engineered to resist cracking and discoloration, it restores both the function and appearance...

472610Z Switch Membrane Pad by Pentair | MasterTemp & Max-E-Therm Heater Control Pad

Bring your heater's control interface back to full responsiveness with the genuine Pentair Switch Membrane Pad 472610Z. This factory-original replacement membrane is built to work with both MasterTemp and Max-E-Therm heater lines, delivering crisp, accurate button response for temperature adjustments and system settings. Fabricated from tough, weather-resistant materials, this membrane pad stands up to outdoor conditions and regular use while remaining simple to swap out,...

77707-0054 Pentair Igniter & Gasket Kit | MasterTemp & Max-E-Therm Pool Heater Replacement

Get your pool heater firing reliably again with the genuine Pentair Igniter and Gasket Kit 77707-0054, a factory-spec replacement set designed for MasterTemp and Max-E-Therm heating units. The kit pairs a precision-manufactured hot-surface igniter with a matching gasket to deliver a tight, sealed fit and dependable ignition every time you call for heat. Straightforward drop-in installation means you can have your heater back online quickly...

42001-0057S Pentair 120V/240V Transformer with Dual & Single Adapter | MasterTemp & Max-E-Therm Heaters

Power your Pentair heater with confidence using the Pentair Transformer 42001-0057S, a genuine OEM power management component designed for MasterTemp and Max-E-Therm Heaters. Equipped with both dual and single adapter configurations, this transformer accommodates 120V and 240V electrical setups, giving you flexibility regardless of your home's wiring. It delivers steady, regulated voltage to your heater, which is fundamental for safe operation and reliable temperature output....

42001-0107S Pentair 115V/230V Dual Voltage Transformer Kit for Max-E-Therm & MasterTemp Heaters

The Pentair 42001-0107S Dual Voltage Transformer Kit is a factory-original electrical component that supplies stable, regulated power to Max-E-Therm and MasterTemp gas heaters across both 115V and 230V service configurations. Whether you are replacing a failed transformer or addressing intermittent ignition issues caused by voltage irregularities, this kit delivers the consistent electrical output your heater's control board requires for reliable startup and operation. Packaged with...

42001-0061S Air Flow Switch for MasterTemp & Max-E-Therm Pool Heaters | Pentair

The genuine OEM Pentair Air Flow Switch (42001-0061S) is the safety sensor that confirms adequate combustion air is reaching the burner before allowing ignition. It monitors the pressure differential across the air metering orifice; once airflow reaches the required threshold, the switch closes the circuit to the hot surface igniter (HSI), which lights the gas-air mixture. During a typical heating call, the blower and HSI...

42001-0056S Terminal Board by Pentair | MasterTemp & Max-E-Therm Heater Electrical Board

Restore dependable electrical connections in your pool heater with the genuine Pentair Terminal Board 42001-0056S, factory-designed for MasterTemp, ETI 400, and Max-E-Therm heater systems. This terminal board serves as the central wiring junction within the heater, providing secure contact points for all internal electrical components. Built from heat-resistant, UL-grade materials, it ensures safe, reliable power distribution throughout the heater's control circuit. The straightforward mounting design...

42002-0025S Pentair 140° Automatic Gas Shut-Off Switch - MasterTemp & Max-E-Therm Heaters

Protect your pool or spa heater investment with this genuine Pentair Automatic Gas Shutoff Switch. Engineered as a critical safety device, this switch continuously monitors operating temperature and immediately cuts the gas supply whenever the system reaches 140 degrees Fahrenheit. This rapid response prevents overheating scenarios that could lead to equipment failure or dangerous conditions. The switch is built as a direct drop-in for Pentair...