Crown PMW-3S Aquastat Immersion Well – 3/4" Standard
Ensure precise and reliable temperature sensing for your boiler or hydronic system with the Crown PMW-3S Aquastat Immersion Well. Built with durable materials and designed for compatibility, this immersion well provides accurate readings for proper boiler control.
✅ Key Features
-
✅ 3/4" standard size for easy compatibility with most aquastats and boilers
-
✅ Insertion length: 3" for precise temperature sensing
-
✅ Overall length (OAL): 4 7/8"
-
✅ Constructed from brass and copper for durability and corrosion resistance
-
✅ Direct replacement for Honeywell 121371B
-
✅ Ideal for oil, gas, and hydronic heating systems
📊 Specifications
| Feature | Specification |
|---|
| Model |
PMW-3S |
| Type |
Aquastat Immersion Well |
| Nominal Size |
3/4" Standard |
| Insertion Length |
3" |
| Overall Length (OAL) |
4 7/8" |
| Material |
Brass and Copper |
| Replaces |
Honeywell 121371B |
| Application |
Temperature sensing for aquastats and boilers |
⚠️ Common Symptoms
Replace this immersion well if you notice:
-
Inaccurate or fluctuating temperature readings
-
Boiler cycling too frequently or failing to maintain set temperatures
-
Corrosion, leaks, or physical damage in the existing well
-
Difficulty installing or fitting older replacement wells
❓ Frequently Asked Questions (FAQ)
Q: What is the insertion length of this well?
A: 3 inches, designed to provide proper immersion for accurate temperature sensing.
Q: Which systems is this compatible with?
A: Works with most standard aquastats and is ideal for oil, gas, and hydronic boilers.
Q: What materials is it made from?
A: Brass and copper for long-lasting durability and corrosion resistance.
Q: Can it replace worn or outdated wells?
A: Yes, it is a direct replacement for Honeywell 121371B and other compatible 3/4" aquastat wells.
🛒 Shopping Tips
-
Confirm your system requires a 3/4" standard immersion well
-
Inspect the old well for corrosion or buildup before replacement
-
Ensure proper installation to prevent leaks
-
Compatible with standard aquastats and boiler controls
