Raypak 006805F Sensor Well (Thermowell) for Millivolt Pool Heaters
The Raypak 006805F is a stainless steel sensor well (thermowell) used on compatible Raypak millivolt-style pool heaters. It threads into the heater header and provides a protected pocket for the temperature sensing probe/capillary, helping ensure accurate temperature feedback while shielding the sensor from direct water flow and turbulence.
Key Details
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Manufacturer: Raypak
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Part Number: 006805F
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Part Type: Sensor well / thermowell
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Material: Stainless steel tube with brass threaded end
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Function: Houses/protects the temperature sensing element in the header for stable, reliable temperature control
Dimensions
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Inside Diameter (ID): 15/32"
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Outside Diameter (OD): 9/16"
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Length: 3-3/8"
Common Heater Compatibility
- Raypak 206A, 266A, 336A, 406A (Digital Atmospheric series)
- Raypak 207A, 267A, 337A, 407A (Digital Low NOx Millivolt series)
Note: Compatibility can vary by heater revision and header type. The most reliable confirmation is matching the part number from your heater’s parts breakdown or comparing the original sensor well dimensions and thread style.
What This Part Does
- Provides a sealed, threaded mounting point in the heater header for the temperature sensor.
- Protects the sensing element from direct water impact, helping improve stability and reduce premature sensor damage.
- Helps maintain accurate heater cycling and temperature regulation when the sensor is properly seated in the well.
When to Replace
- Water seepage/leaking at the sensor well/header connection
- Cracked, corroded, or damaged well tube or threaded end
- Sensor will not seat properly, is loose, or cannot be secured
- Header service where the original well is seized or damaged during removal
Installation Notes
- Shut off gas and power, and allow the heater to cool completely before servicing.
- Relieve system pressure and drain down as needed to prevent water loss when the well is removed.
- Thread the well in carefully to avoid cross-threading the header.
- After installation, confirm the sensor is fully seated in the well and secured per the heater design.
- Restore flow and check for leaks after startup.
Related Products (Aqua Pool Supply)
Maintenance Tip
If you’re troubleshooting temperature issues, inspect the sensor seating and the sensor well opening for scale buildup. Keeping the sensor fully seated and the well clean helps the heater read water temperature accurately and cycle properly.
