White-Rodgers F89-0033 Well

The White-Rodgers F89-0033 is a heavy-duty 3/4" NPT immersion well designed for professional hydronic heating and industrial temperature control applications. Engineered for seamless integration with White-Rodgers aquastat controls, this well accommodates a 3 1/2" x 7/16" sensing bulb, providing a critical thermal interface between the system fluid and the controller. By utilizing high-conduction materials, the F89-0033 ensures rapid heat transfer for precise temperature monitoring while isolating the sensitive capillary bulb from direct contact with corrosive or high-pressure liquids. This HVAC immersion well simplifies system maintenance, allowing contractors to pull the sensor for testing or replacement without the need to drain the boiler or pressure vessel. Its robust 3/4 inch pipe size thread ensures a leak-proof fit in standard tappings, making it a reliable choice for commercial boiler systems and water heater applications. When accuracy and system uptime are non-negotiable, the F89-0033 well provides the mechanical protection and thermal sensitivity required for demanding technical environments.

• Compatible with White-Rodgers 11B06, 11B37, and 1182 series controls.
• Features a standard 3/4" NPT connection for easy installation in most hydronic headers and tanks.
• Designed for 3.5" x 7/16" bulbs, ensuring a snug fit and optimal thermal response.
• Enables sensor replacement without system depressurization or fluid loss.
• Constructed for durability in high-cycle heating and cooling environments.

What is the thread size for the F89-0033?
This model uses a 3/4 inch NPT (National Pipe Thread) fitting, which is standard for many commercial and residential boiler tappings.

Can I use this well with a smaller bulb?
This well is specifically bored for a 7/16" diameter bulb. Using a significantly smaller bulb may result in a "dead air" space that delays temperature response; a heat-conductive compound is recommended to ensure accurate readings.

Does this fit more than one White-Rodgers control?
Yes, the F89-0033 is a universally interchangeable well compatible with various White-Rodgers temperature controls that utilize the specified bulb dimensions.

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.