Misakomo Thermal Regulator for MasterTemp & Sta-Rite Heaters | Replaces 77707-0010 (SR200/SR333/SR400)

Upgrade your pool and spa heating with Misakomo

The Misakomo Thermal Regulator is a purpose-built replacement designed to restore efficient heating for a range of MasterTemp and Sta-Rite heaters. Engineered to withstand regular use, it supports steady warmth and reduces the frustration of temperature swings, helping you enjoy pool and spa time more predictably.

What to expect from a regulator upgrade

When the thermostat control ages, you may notice more cycling and slower heat-up. This regulator is designed to address those common issues by promoting a quicker approach to the target temperature, so you reach comfort faster and with less wait time.

• Faster heating: A more reliable thermal response helps water reach the desired temperature sooner.
• Reduced cycling: A steadier regulation can minimize on/off fluctuations that become noticeable over time.
• Premium durability: High-quality metal construction resists corrosion and rust, extending service life.
• Saltwater-friendly: Designed to withstand outdoor, salt-influenced environments.
• Easy installation: Simple swap with the included regulator, spring, and cap, designed to fit common inlet/outlet configurations.
• Peace of mind: 12-month warranty protects your investment and supports confidence in the upgrade.

In practical use, homeowners often notice calmer heat-up cycles and a more reliable temperature profile, which translates to fewer adjustments and a more enjoyable pool or spa experience. While results can vary by setup, the regulator is built to support dependable performance across compatible models.

Compatibility and fit you can count on

This regulator is designed to work with MasterTemp heaters (125/200/250/300/333/400) and Sta-Rite Max-E-Therm units (SR200/SR333/SR400). It sits between the inlet and outlet water connections on the water manifold, and the kit includes the regulator, a spring, and a cap to facilitate installation.

Choosing Misakomo means opting for a component that aligns with standard heat-performance expectations for residential pool and spa setups, with a focus on durability and straightforward maintenance. If you’re refreshing an older unit or replacing a worn part, this regulator offers a practical, non-disruptive option to help your heater run more smoothly.

Key takeaways

• Direct compatibility with MasterTemp and Sta-Rite SR-series heaters.
• Improved heat recovery and temperature stability where applicable.
• Corrosion-resistant metal construction for longevity in various environments.
• Included components support a complete swap with minimal tools.
• Backed by a 12-month warranty for added assurance.