EN121371A ELITE 1/2" NPT Aquastat Well – 3" Insertion for Honeywell 121371A
The EN121371A ELITE Aquastat Well is a precision-engineered copper immersion well designed as a direct fit for Honeywell 121371A aquastats. Built with durability and conductivity in mind, this well ensures accurate sensor placement and reliable operation in heating systems.
⚠️ Note: Well clamp assembly is sold separately and not included.
✅ Key Features
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Direct replacement for Honeywell 121371A aquastat wells
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1/2" NPT threaded connection for secure installation
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3" insertion length for accurate temperature sensing
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Durable copper construction for optimal thermal transfer
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1-1/2" insulation depth for dependable performance
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Compact and reliable design for long service life
📊 Technical Specifications
| Specification | Details |
|---|
| Connection Size |
1/2" NPT |
| Insertion Length |
3" |
| Shell I.D. |
3/8" |
| Bulb Size |
3/8" × 3" |
| Insulation |
1-1/2" capillary |
| Diameter |
5/64" |
| Material |
Copper |
⚠️ Common Symptoms of a Faulty or Worn Aquastat Well
If your heating system shows these signs, the well may need inspection or replacement:
✅ Inaccurate or fluctuating temperature readings
✅ Aquastat sensor not seating properly in the well
✅ Visible corrosion or pitting on the copper well
✅ Difficulty threading or securing the well into place
✅ Sensor overheating due to poor thermal transfer
🔄 Quick Reference Compatibility Chart
| OEM Brand | OEM Part Number | Replacement |
|---|
| Honeywell |
121371A |
EN121371A |
❓ Frequently Asked Questions (FAQ)
Q: What system does the EN121371A replace?
A: It is a direct replacement for Honeywell 121371A aquastat wells.
Q: What material is the well made of?
A: High-quality copper for optimal thermal transfer and durability.
Q: Is the clamp assembly included?
A: No, the well clamp assembly is sold separately.
Q: When should I replace an aquastat well?
A: Replace if the well shows corrosion, leaks, or fails to hold the sensor securely.
