Pentair 42002-0024S Stack Flue Sensor – Replacement for Sta-Rite MasterTemp & Max-E-Thermostat Heaters
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The Pentair 42002-0024S Stack Flue Sensor is a genuine OEM heater safety component designed to monitor exhaust gas temperature and ensure proper venting in gas pool and spa heaters. When installed correctly, this precision sensor helps your heater maintain safe combustion and prevents overheating or unsafe operation. This replacement part is engineered to meet the original factory specifications and deliver reliable performance over time.
Pentair 42002-0024S Stack Flue Sensor Compatibility
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Fits Sta-Rite MasterTemp natural gas and propane pool & spa heaters
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Compatible with Sta-Rite Max-E-Therm heater models
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Designed for use with gas heaters requiring stack temperature feedback control
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Works with standard venting configurations on compatible Pentair heater models
Frequently asked questions
How do I size a pool heater?
Heater sizing follows pool surface area, the temperature rise you want and how exposed the pool is to wind. A larger BTU rating heats faster and cycles less; an undersized heater runs continuously and still struggles on cold nights. Gas heaters also need a gas line and meter capacity that can supply their rated input.
What is the part number for this heater component?
Sta-Rite lists this heater component under part number 42002-0024S. Quote 42002-0024S when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
What routine maintenance does a pool heater need?
Keep water chemistry balanced, because low pH and high calcium hardness are the two most common causes of premature heat exchanger failure. Beyond that: keep the cabinet clear of debris, check for rodent nests before each season, and have the burner and gas train inspected periodically.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Sta-Rite equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
Is this the complete heater or a replacement part?
Check the title and the specification section above. Heater listings and heater component listings share the same part-number format, so confirm whether you are buying a full appliance or a single serviceable component before ordering.
Is there a warranty on this heater component?
It carries the standard Sta-Rite manufacturer warranty. The terms are set by Sta-Rite, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.