Utica-Dunkirk 550002858 Aquastat

The Utica-Dunkirk 550002858 Aquastat is a heavy-duty SPST immersion aquastat designed for accurate limit or regulation control of water temperatures in hydronic heating systems. Specifically engineered for Utica and Dunkirk boiler systems, this OEM component operates across a 110°F to 200°F range to maintain optimal thermal stability. As a 240007710 retrofit kit equivalent, it is the primary replacement for obsolete 146-62-025 and L7148F1042 controls. The unit utilizes a brass sensor bulb and capillary tube for responsive switching, ensuring the burner cycles correctly to prevent overheating and maximize system efficiency.

Professional installers prefer the Utica-Dunkirk 550002858 for its direct-fit compatibility, which eliminates the need for extensive field modifications when upgrading older control panel assemblies. This immersion-style temperature control features a single-pole, single-throw (SPST) switch configuration that breaks the circuit on temperature rise, providing a reliable safety limit for residential and commercial hot water boilers. Its corrosion-resistant finish is built to withstand the high-demand environments typical of mechanical rooms, ensuring long-term performance and consistent boiler temperature regulation.

Key Benefits for Technicians

• Direct OEM Replacement: Fully replaces obsolete part numbers 240007710, 146-62-025, and Honeywell L7148F1042 without bracket modifications.
• Broad Operating Range: Adjustable 110-200°F temperature setpoint allows for precise calibration based on specific hydronic system requirements.
• Responsive Thermal Sensing: High-sensitivity immersion probe provides real-time water temperature monitoring for immediate switch activation.
• Robust Electrical Design: SPST switching rated for standard boiler control circuits, supporting high-cycle reliability in various heating applications.
• Enhanced Durability: Industrial-grade construction with a brass bulb ensures resistance to mineral buildup and system contaminants.

Common Questions

Does this kit include everything needed to replace the 240007710?
Yes, the 550002858 is the designated retrofit kit for the older 240007710 assembly, including necessary wiring changes and updated components for a seamless swap.

Can this aquastat be used as a high-limit control?
This SPST immersion aquastat is frequently utilized as a high-limit control because it breaks the circuit as the temperature rises toward the 200°F maximum threshold.

Is this compatible with other boiler brands?
While designed as a genuine Utica-Dunkirk boiler part, its universal 110-200°F range and SPST logic allow it to function in many hydronic systems requiring a standard well-mounted immersion controller.

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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.