Resideo - Honeywell Home 121371M Aquastat Sensor Well Assembly

Aquastat Sensor Well Assembly delivers precise immersion sensing for boiler and hot-water systems. The 121371M model uses an immersion-type design with a capillary sensor and a copper well for durability and fast temperature response.

Key specifications include a 3/8 inch bulb diameter by 3 inch length, a 3/4 inch threaded connection, 3 inch insulation depth, and a capillary diameter of 5/64 inch. The assembly is rated for up to 255 PSI at 300°F, making it suitable for demanding commercial and residential applications. Includes the 121371 mounting clamp for secure, easy installation.

• Immersion-type aquastat sensor well
• Capillary sensor with 5/64 inch diameter
• Bulb size 3/8 inch diameter x 3 inches
• Threaded connection: 3/4 inch
• Copper construction for durability and quick response
• Insulation depth: 3 inches
• Pressure rating: 255 PSI at 300°F
• Includes mounting clamp 121371