Hydrotherm 02-2406 Aquastat

The Hydrotherm 02-2406 Aquastat is a mission-critical immersion-type temperature controller engineered for high-performance hydronic systems. Featuring a Single Pole Single Throw (SPST) switching configuration, this rugged aquastat relay provides precise thermal regulation across a broad 40°F to 240°F operating range. Designed for direct insertion into the medium, the Hydrotherm 02-2406 functions as a reliable high-limit or low-limit control, ensuring the boiler operates within safe parameters while preventing short-cycling through accurate differential management. This OEM-spec component is specifically tailored for Hydrotherm R-Series and early-model gas-fired water boilers, offering a direct fit for 180C, 210C, and 250C units. For technicians seeking a robust boiler temperature switch that integrates seamlessly with existing wiring harnesses and 24V control circuits, this unit maintains system integrity and optimizes fuel efficiency by enforcing strict thermal cut-in and cut-out setpoints with industrial-grade repeatability.

• Versatile Thermal Range: Precision control from 40°F up to 240°F, suitable for a wide array of hydronic heating and immersion bath applications.
• OEM Compatibility: Exact replacement for Hydrotherm 02-2406, ensuring proper alignment with 1/2" or 3/4" NPT immersion wells.
• Robust SPST Switching: High-reliability internal contacts designed to handle the inductive loads of circulator pumps and gas valves.
• Limit Protection: Acts as a failsafe high-limit aquastat to prevent system overheating and potential boiler vessel damage.

• What is the primary mounting style for this aquastat? This is a direct immersion controller designed to mount via a liquid-tight well, ensuring the sensing bulb is in constant contact with the system medium for rapid response.
• Can this be used as a circulator controller? Yes, because it is an SPST immersion aquastat, it can be wired to make or break the circuit on temperature rise, making it suitable for both limit control and circulator staging.
• Does this include the immersion well? Standard packaging typically includes the controller head and sensing bulb; technicians should verify if the existing well is clear or if a new spud is required for the 02-2406 installation.

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.