White-Rodgers F89-0148 Well

The White-Rodgers F89-0148 is a professional-grade immersion well designed for seamless integration with hydronic control systems. Engineered with a 1/2" NPT standard shank, this well provides a robust pressure-sealed interface between the system fluid and the temperature sensing bulb, preventing leaks while ensuring high thermal conductivity for precise response times. This model is specifically sized for hydronic controls requiring a bulb dimension of 2-15/16" x 7/16", offering a reliable fit that eliminates the need for field modifications or oversized adaptors.

For service technicians and mechanical contractors, the White-Rodgers F89-0148 Well represents a critical component when installing or replacing aquastat controllers and other temperature-sensing devices. It allows for the removal or testing of the temperature sensing bulb without having to drain the entire boiler or piping loop, significantly reducing downtime during maintenance calls. Built for durability in high-demand residential and commercial heating applications, this 1/2" immersion well ensures your controls receive the accurate temperature data required for efficient boiler cycling and system protection.

• Compatible with a wide range of White-Rodgers and Emerson hydronic controls requiring a 2-15/16" sensor bulb.
• Built with a 1/2" NPT standard shank for universal fit into common boiler tappings and pipe fittings.
• Facilitates "dry" sensor replacement, allowing for HVAC temperature sensor maintenance without system depressurization.
• Superior heat transfer characteristics ensure the boiler temperature control reacts quickly to thermal changes.
• Durable construction designed to withstand the chemical and pressure rigors of closed-loop hydronic systems.

What bulb size does the F89-0148 accommodate?
This well is precision-machined for 2-15/16" long bulbs with a 7/16" diameter, which is a common standard for many White-Rodgers hydronic temperature controls.

Can I use this for a 3/4" NPT tapping?
The F89-0148 features a 1/2" NPT connection. For 3/4" tappings, a high-quality brass bushing is required, though a direct-fit 3/4" well is often preferred to maintain the correct insertion depth.

Does this well include heat-conductive compound?
While the well is designed for a tight thermal fit, veterans recommend using a thermal paste (heat-conductive grease) inside the well shell to maximize accuracy and minimize lag between the fluid and the sensor.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.