White-Rodgers F89-0211 Well

The White-Rodgers F89-0211 is a standard-shank immersion well designed for hydronic systems requiring a high-integrity thermal interface. Engineered with a 1/2" NPT spud and a 1 13/16" shank length, this component is universally compatible with White-Rodgers and Emerson 11DXX, L4000, and L6000 series hydronic temperature controls. As a veteran-grade solution for boiler tank monitoring, the F89-0211 facilitates accurate fluid temperature sensing while allowing for the removal of the control bulb (standard 3-1/2" x 3/8" bulb size) without the need to drain the entire closed system. Heavy-duty construction ensures a leak-free seal and optimal heat transfer, critical for maintaining boiler efficiency and preventing sensor lag in HVAC hydronic applications. Whether performing a new installation or a field replacement, this 1/2-inch well provides the reliable fit and durability required for professional heating system maintenance.

• System Continuity: Allows for control bulb replacement or maintenance without draining the boiler or closed-loop system, reducing downtime.
• Standardized Fit: Featuring a 1/2" NPT connection and standard shank, it integrates seamlessly into existing boiler tapings.
• Universal Compatibility: Specifically designed to house 3-1/2" x 3/8" bulbs, making it the industry standard for Emerson and White-Rodgers hydronic controls.
• Durable Construction: Built to withstand the high pressures and temperatures characteristic of commercial and residential hydronic heating environments.

What is the shank length of the White-Rodgers F89-0211?
This model features a 1 13/16" shank, which is the standard length for traditional hydronic immersion applications.

Which control bulbs fit this immersion well?
The well is engineered for use with all standard hydronic controls utilizing a 3-1/2" x 3/8" sensing bulb.

Do I need a packing nut with this well?
While the well provides a sealed environment for the bulb, for direct immersion applications where higher sensitivity is required, a separate packing nut (like the F55) may be used if the system is drained.

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.