Resideo - Honeywell Home 123871A Aquastat Sensor Well Assembly

The Aquastat Sensor Well Assembly from Resideo - Honeywell Home 123871A delivers reliable immersion-type temperature sensing for boiler and hydronic systems. This copper sensor well features a 3/8 inch bulb, a 3 inch length, and a 3/4 inch threaded connection, providing precise readings in demanding environments and compatibility with standard immersion probes. Constructed from copper with an insulation depth of 3 inches, this assembly minimizes heat transfer loss and extends sensor life. It also carries a robust 255 PSI at 300°F pressure rating for dependable operation in high-temperature boiler zones. Ideal for both residential and commercial heating setups, it supports quick installation with standard fittings and corrosion-resistant copper construction to ensure long-term reliability across different aquastats and controllers.

• Immersion-type design: optimized for direct liquid contact and fast response
• Bulb size: 3/8 inch diameter x 3 inch length
• Threaded connection: 3/4 inch threaded for secure fitting
• Material: copper construction for durability and thermal conductivity
• Insulation depth: 3 inches to reduce heat loss
• Pressure rating: 255 PSI at 300°F for high-temperature applications