The 7 best automatic pool heater shutoff systems of 2025

140F Automatic Gas Shutoff Switch Replacement

Fits Pentair Mastertemp Pool And Spa Heater Electrical Systems

Also Fits Pentair Sta-Rite Max-E-Therm Pool And Spa Heater Electrical Systems Model Sr200, Sr333, Sr400

Country Of Origin: China

ESSENTIAL SAFETY UPGRADE FOR POOL & SPA HEATERS – The Pentair Replacement 140F Automatic Gas Shutoff (AGS) Switch 42002-0025S is a vital component that enhances the safety and efficiency of your pool or spa heating system. Designed to prevent overheating, it automatically shuts off the gas supply when temperatures exceed 140°F. This ensures stable operation, protecting your equipment while maintaining a comfortable and controlled water temperature.

COMPATIBLE DESIGN WITH PRECISE FIT – This replacement switch is designed specifically for Pentair Sta-Rite Max-E-Therm pool and spa heaters, fitting models SR200, SR333, and SR400. It serves as a direct replacement for the Pentair 42002-0025S switch, ensuring a seamless fit. The package includes one 140F AGS switch with the exact specifications needed for proper installation. Its precise dimensions allow for a secure and stable connection within your heating system.

PREMIUM-QUALITY MATERIALS FOR DURABILITY – Crafted with high-grade materials, this gas shutoff switch is built to endure the demanding conditions of pool and spa environments. Resistant to high heat, humidity, and chemical exposure, it ensures long-lasting functionality. The advanced sensor technology provides accurate temperature monitoring and swift shutoff response, helping maintain optimal water temperature while reducing potential risks associated with overheating.

SIMPLE INSTALLATION FOR QUICK REPLACEMENT – Designed for easy installation, this replacement AGS switch allows pool and spa owners to restore their heater’s safety function without professional assistance. Simply remove the faulty switch and secure the new one in place for immediate functionality. This automatic shutoff component works efficiently by detecting excessive temperatures and cutting off the gas supply, providing enhanced protection with minimal effort.

TRUSTED USA MANUFACTURER WITH WARRANTY ASSURANCE – Manufactured by Wholesale Sensors, a reputable USA-based company, this replacement switch is backed by an 18-month warranty for added confidence. With a commitment to delivering reliable and durable pool maintenance solutions, Wholesale Sensors ensures quality control in every product. Customers can trust in the performance, safety, and longevity of this essential heating system component, backed by dedicated USA-based support.

𝐑𝐢𝐬𝐤-𝐅𝐫𝐞𝐞 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞--𝐁𝐚𝐜𝐤𝐞𝐝 𝐛𝐲 𝟐-𝐲𝐞𝐚𝐫𝐬 𝐰𝐚𝐫𝐫𝐚𝐧𝐭𝐲 𝐟𝐨𝐫 𝐚𝐝𝐝𝐞𝐝 𝐩𝐞𝐚𝐜𝐞 𝐨𝐟 𝐦𝐢𝐧𝐝（𝐬𝐮𝐩𝐩𝐨𝐫𝐭 𝐫𝐞𝐭𝐮𝐫𝐧/𝐞𝐱𝐜𝐡𝐚𝐧𝐠𝐞）If you have any problems during guarantee period, please feel free to contact us via YOUR ORDER/ EMAIL / QA, We will reply to you within 24 hours. For whatever reason you are not satisfied, you can request 𝗮 𝗿𝗲𝗽𝗹𝗮𝗰𝗲𝗺𝗲𝗻𝘁 𝗼𝗿 𝗮 𝗿𝗲𝗳𝘂𝗻𝗱

𝐖𝐈𝐃𝐄 𝐂𝐎𝐌𝐏𝐀𝐓𝐈𝐁𝐈𝐋𝐈𝐓𝐘 >>>The 42002-0025S Automatic Gas Shutoff Switch (AGS) compatible with Pentair Mastertemp (400 /200 /300/125) , Sta Rite Max-E-Therm (Sr200 / Sr333 / Sr400) Pool Heaters models, Sta Rite heater and all HD Versions, Mastertemp all the BTU's.Whether you're enjoying a leisurely swim or hosting a pool party, the AGS Switch ensures that your water remains at the ideal temperature, providing comfort and enjoyment year-round

𝐖𝐇𝐀𝐓 𝐘𝐎𝐔 𝐆𝐄𝐓 >>>The pentair mastertemp 400 parts is an important safety component mainly used in pool and spa heater electrical systems.The switch monitors the temperature of the pentair pool heater and automatically turns off the gas supply when the temperature exceeds 135°F, protecting the heater from high temperature damage. 42002-0025S and 42001-0063S have same 135F cutoff temp, VDC, and thread size. Replaces Part: 42001-0063S, STA-151-6255, 42001-0064S, HMXHLI2932, HAXHLI1930

𝐔𝐏𝐆𝐑𝐀𝐃𝐄 𝐐𝐔𝐀𝐋𝐈𝐓𝐘 >>>42001-0064S high limit switch is made of High-quality metal materials, resistant to corrosion and high temperatures.Replaces gas shutoff switch that has been damaged, corroded, rusted or failed. Each switch has undergone strict pre-factory testing, including pressure testing, temperature testing,air tightness testing, to ensure reliable operation under the most demanding conditions.Fix symptoms: Pool heater not running/AGS error code /Control panel showed HLS

𝐄𝐀𝐒𝐘 𝐈𝐍𝐒𝐓𝐀𝐋𝐋𝐀𝐓𝐈𝐎𝐍 >>>Simply turn off the pump and all electricity going to the pool heater. Unbolt and remove the cover of the heater.Disconnect the wires from the old indoor gas shutoff switch.Remove the old gas shutoff switch by turning it counter-clockwise with a 11/16" open end wrench. Install the new gas shutoff switch, sealing it with a bead of RTV sealant before threading it into the exhaust elbow.Youtube videos are your best installation assistant

FITMENT INFORMATION -- Fits for Pentair Mastertemp Pool And Spa Heater Electrical Systems. Also compatible with Pentair Sta-Rite Max-E-Therm Pool And Spa Heater Electrical Systems Model Sr200, Sr333, Sr400.

NICE PERFORMANCE -- This 42002-0025S Gas Shutoff Switch is designed to detect when water temperature exceeds 140F and automatically open heat exchanger outlet. Fast and inexpensive way to DIY fix your appliaction problem.

DIRECT REPLACEMENT -- Replace part # 42002-0025S, meet or excess oem performance standard. Replaces gas shutoff switch that has been damaged, corroded, rusted or failed.

SUPERIOR QUALITY -- Made of premium brass for stability, durability and reliability, will not damaged even in hard condition, ensures an unparalleled long lifespan!

【Perfect Replacement】Pentair 42002-0025S 140F Automatic Gas Shutoff Switch for Pool and Spa Heater Electrical Systems

【Comapatible】High Limit Switch for Pentair Sta-Rite MasterTemp (All Models) & Max-E-Therm Pool Heaters - Models SR200, SR333, SR400

【Comapatible】This replacement limit switch will work on Pentair Mastertemp 400 parts along with all the other BTU's. It is also compatible with the Sta Rite heater and the Pentair Mastertemp 125

【Fault】You will know to change out the hi-limit switch when the HLS LED indicator is illuminated. HLS is short for High Limit Switch. The upgraded Pentair boards will also say HLS on the main display.

【Location】The high limit switch is located within the heater on the black manifold next to the other sensors. The two wires connecting to the sensor will be plugged in when opening.

【Purpose】The purpose of this sensor is to measure the turn off the heater if the water temperature reaches the HIGH TEMPERATURE LIMIT of 135°F. This is to ensure system safety.

Package Includes: You will receive 1 piece of 42002-0025S (140F) brass high limit switch, suitable for Pentair Sta-Rite, Max-E-Therm Pool and Spa Heater Electrical System Models Sr200, Sr333, Sr400.

Durable Material: The high limit switch is made of premium brass, which is strong, durable, resistant to high temperatures and various outdoor conditions, not easy to damage, and can be used for a long time.

Product Function: This switch provides reliable performance, ensuring your pool and spa operate safely and efficiently while protecting your pool heater.

Easy To Install: Easy to install and replace, this replacement part will quickly repair your pool heater and keep your pool or spa running smoothly.

Compatibility: Our accessories are compatible with Pentair Sta-Rite, MasterTemp, Max-E-Therm pool and spa heaters, ensuring seamless compatibility and reliable performance. Please note that our product is not sponsored or endorsed by, or affiliated with the brands it fits, including Pentair Sta-Rite, MasterTemp, Max-E-Therm.

Specification: Vacuum relief valve size: 3/4". Please note the applicable brand and size before ordering

Fitment: 3/4" vacuum relief valve compatible with Heliocol Sunstar SwimJoy SwimLux Solar System. Function - Allow water to drain properly to prevent freezing

Easy to Install: Use teflon tape and do the job, it helps you finish the installation of 3/4" vacuum relief valve. As easy as screwing in a bulb, no need to ask a professional repair man

Fix Leakage: If your old 3/4" vacuum isolation valve is broken, which can cause your solar pool heater to leak, consider replacing it with this brand new valve to restore comfort and swimming experience

Durable: The solar water heat control is made from durable materials to maximize the performance of the solar pool heater and keep your pool at the optimum temperature