White-Rodgers 1145-33 Control

The White-Rodgers 1145-33 is a high-performance direct immersion hydronic control designed for rapid temperature sensing in boiler and hot water systems. This SPST aquastat features a liquid-filled 11-3/16" fast response bulb that sits directly in the water stream, virtually eliminating thermal lag for precise cycling. As a veteran-grade high limit control, it operates on a temperature-rise-to-open logic within a 100°F to 240°F range. The unit includes an adjustable differential (5°F to 45°F), allowing contractors to fine-tune system operation and prevent short-cycling. Built with a standard 1/2" NPT pipe thread, the 1145-33 provides a rugged, reliable interface for heavy-duty hydronic applications.

Field technicians should note that the White-Rodgers 1145-33 is the authorized replacement for 1145-42 and competitive model 9004793105. When installing, it is critical to observe the factory-set dial stops. Always recalibrate these stops to match the original control’s specifications to prevent equipment over-firing or safety hazards. This immersion temperature control is U.L. listed and C.S.A. approved, ensuring it meets strict industrial standards for boiler temperature regulation and safety.

• Fast Response Temperature Sensing: The 11" hydraulic action element ensures immediate reaction to water temperature shifts, protecting the heat exchanger from overheating.
• Direct Immersion Design: Eliminates the need for a separate well (in most direct-mount scenarios), providing more accurate readings than strap-on alternatives.
• Versatile Compatibility: Seamlessly replaces legacy White-Rodgers models and 9004793105 units found in commercial and residential boilers.
• Industrial Calibration: Features a dual-scale dial (°F and °C) and adjustable differential for custom system optimization.

Is the bulb compatible with standard immersion wells?
The 1145-33 is a direct immersion unit with a 1/2" pipe thread. While it is designed for direct contact with the medium, ensure you verify the insertion length and thread pitch for your specific manifold.

Does this unit function as a circulator control?
Because this is an "Open on Rise" (SPST) switch, it is typically utilized as a high-limit safety. For circulator applications requiring "Close on Rise" functionality, please consult the wiring diagram or alternate 1100-series models.

How do I adjust the factory dial stops?
The dial stops are protection limits set at the factory. Technicians must manually reset these to align with the original system's high-limit requirements to maintain safe operating parameters.

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.