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

• Fits Sta-Rite MasterTemp natural gas and propane pool & spa heaters

• Compatible with Sta-Rite Max-E-Therm heater models

• Designed for use with gas heaters requiring stack temperature feedback control

• Works with standard venting configurations on compatible Pentair heater models

Key Features

• Genuine Pentair part, supplied under manufacturer part number 42002-0024S.
• Sized by BTU output — match the rating and fuel type to your existing unit.
• Ships from our US warehouse with tracking on dispatch.

Specifications

• Brand: Pentair
• Manufacturer part number: 42002-0024S
• Category: Pool Heaters
• Condition: New
• UPC / GTIN: 022315300897
• Shipping weight: 0.25 lb

Frequently Asked Questions

Is the 42002-0024S a genuine Pentair part?

Yes. The 42002-0024S is a Pentair part supplied under that manufacturer part number. It is not a generic substitute.

Does the BTU rating have to match my old heater?

The BTU rating should match or exceed your previous heater. Undersizing means the pool never reaches temperature on cold days; oversizing costs more up front but heats faster and cycles less.

Can this run on propane instead of natural gas?

No. Gas pool heaters are built for one fuel and require a manufacturer conversion kit to change. Check the data plate on your existing unit and order the matching fuel type.

What size heater do I need for my pool?

A common rule is 1 BTU per gallon as a minimum, increased for windy sites, uncovered pools, or cold climates. A 20,000 gallon pool typically starts at 250,000 BTU.

Do I need a professional to install a pool heater?

Gas heaters involve gas line sizing, venting and electrical connections, and most jurisdictions require a licensed installer plus a permit. Improper installation voids the manufacturer warranty.

How do I confirm this part fits my equipment?

Check the part number stamped on the component you are replacing, or find it on the parts schematic in your owner's manual. If the number differs or is unreadable, send us your equipment model and serial number and we will verify fitment before you order.

How quickly does this ship?

In-stock items ship from our US warehouse on business days. You will receive tracking by email once the order leaves the warehouse.

Can I return it if I ordered the wrong part?

Unopened, uninstalled items can be returned within 30 days. Equipment that has been installed or plumbed cannot be returned, so confirm fitment before installation.

Is this covered by a warranty?

Manufacturer warranty terms vary by brand and product. Warranty claims generally require proof of purchase and, on installed equipment, evidence of professional installation.