White-Rodgers 11B02-1 Aquastat

The White-Rodgers 11B02-1 is a professional-grade strap-on aquastat designed for reliable hydronic temperature control in residential and commercial boiler systems. This surface-mount aquastat features an SPST (Single Pole Single Throw) switch configuration that is open on rise, making it an essential component for high-limit safety applications. With an adjustable temperature range of 100°F to 240°F and a 10°F fixed differential, this control ensures precise thermal management. The unit is engineered for mounting directly onto 1/2" to 4" pipes, utilizing a heat-conductive base for accurate sensing without the need for a well. As a veteran-preferred White-Rodgers 11B2-1 replacement, it includes factory-set dial stops that must be calibrated to match the original equipment specifications to prevent system damage. This rugged high-limit control is built for longevity in demanding mechanical environments, providing the responsiveness required for modern hydronic heating circuits.

• Universal Surface Mounting: The strap-on design allows for fast installation on various pipe sizes without draining the system.
• Precise Thermal Response: Fixed 10°F differential prevents short cycling while maintaining tight system tolerances.
• High-Limit Safety: Open-on-rise operation serves as a reliable safety cutoff for overheating protection.
• Field Adjustable: Features a wide 100°F to 240°F range to accommodate diverse boiler operating parameters.
• Industrial Build Quality: Heavy-duty construction ensures stable electrical switching and resistance to vibration.

Common Technical Questions

Can the White-Rodgers 11B02-1 be used for low-limit control?
No, this model is specifically an "open on rise" control, meaning it breaks the circuit when the temperature hits the set point. It is intended for high-limit safety or circulator cut-off applications.

How do I ensure accurate temperature readings with a strap-on aquastat?
For the best thermal transfer, ensure the pipe surface is clean and use the included mounting strap to pull the heat-conductive base tight against the pipe. Some technicians prefer adding a small amount of heat-sink grease for even faster response.

Do I need to adjust the dial stops upon installation?
Yes, these controls come with factory-preset stops. A qualified technician must reset these stops to match the settings of the original control to ensure the boiler does not exceed its engineered temperature limits.

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.