Resideo - Honeywell Home 121371B Aquastat Sensor Well Assembly

The Aquastat Sensor Well Assembly 121371B from Resideo (Honeywell Home) delivers precise immersion and capillary sensing for boiler and hydronic heating systems. Designed for durable copper construction, this sensor well ensures accurate temperature readings in demanding environments.

With a 3/4 inch threaded connection, 3/8 inch bulb, and a 1-1/2 inch insulation depth, it fits a wide range of aquastats and provides robust performance in high-temperature applications. The copper body delivers excellent thermal conductivity and corrosion resistance, while the compact form simplifies installation and maintenance.

Designed for reliability in residential and commercial systems, the 121371B includes a mounting clamp for secure attachment and ease of service.

• Type: Immersion and Capillary configuration for accurate sensing in boiler and hydronic circuits.
• Bulb size: 3/8" diameter x 3" length for responsive readings.
• Thread: 3/4" threaded connection for broad compatibility with standard aquastats.
• Material: Copper construction provides durability and excellent heat transfer.
• Insulation depth: 1-1/2" insulation minimizes heat loss and stabilizes readings.
• Capillary diameter: 5/64" preserves signal integrity under temperature shifts.
• Pressure rating: 255 PSI at 300°F for high-temperature reliability.
• Includes: 121371 mounting clamp for secure, quick installation.