Genuine Pentair 42001-0053S Thermistor for MasterTemp & Max-E-Therm Pool Heaters 

Ensure accurate water temperature monitoring and efficient operation of your pool heating system with the genuine OEM Pentair 42001-0053S thermistor. This crucial replacement part is designed for seamless integration with Pentair MasterTemp (including 125, 250, 300, 400 BTU models) and Sta-Rite Max-E-Therm (200, 333, 400 BTU models) pool and spa heaters. Constructed from durable, corrosion-resistant stainless steel, this non-resettable sensor accurately detects water temperature and sends precise readings to the heater's control board, helping to maintain consistent water temperature, prevent system errors (like the E01 code), and prolong the lifespan of your heater. 

Key Features

• Accurate Temperature Monitoring: Accurately measures the water temperature entering the heater's manifold and sends precise, real-time data to the control system for efficient operation.
• Wide Compatibility: A direct replacement for most Pentair MasterTemp and Sta-Rite Max-E-Therm heaters, including all BTU models for both natural gas and propane versions.
• Durable Construction: Made from high-quality, corrosion-resistant stainless steel for dependable performance and longevity in harsh pool and spa environments.
• Essential Safety Component: Plays a vital role in the heater's safety systems by ensuring the water temperature does not exceed safe limits (e.g., 104°F).
• Easy Installation: Features two electrical connectors and a simple, thread-mount design for quick and hassle-free replacement, suitable for both professionals and DIY enthusiasts.
• Diagnostic Function: A common replacement item when the heater's control panel displays an E01 error code, indicating a faulty temperature sensor.
• Operating Range: According to sources like Poolandspasupplystore.com, it operates effectively within a temperature range of -20°C to 80°C (-4°F to 176°F).