Resideo - Honeywell Home L8124G1020 Aquastat Relay

Aquastat Relay L8124G1020 from Resideo delivers reliable boiler control for hydronic heating systems. This UL-listed, CSA-approved aquastat features a direct vertical immersion well and a SPST contact configuration for dependable operation in demanding environments.

The sensing element measures 3/8 inch diameter by 2-7/8 inches long, with a fixed high limit and an adjustable low limit to tailor protection for your boiler. Temperature ranges cover 130–240°F for high limit and 110–220°F for low limit, while the switch rating reaches up to 7.4A at 120V AC and 3.7A at 240V AC. The device tolerates up to 265°F on the sensing element and 150°F on the switch, ensuring robust performance across seasonal swings.

• Direct vertical immersion well for quick, accurate sensing
• SPST contact with reliable current ratings
• UL and CSA approved for safety compliance
• Conduit connections: 1/2 inch, with quick connect or screw terminals
• Compact dimensions: 4-3/8 in W x 3-1/16 in D x 6-1/8 in H
• Fixed high limit differential of 10°F; adjustable low limit 10–25°F

Designed for hydronic heating systems, this versatile aquastat integrates seamlessly with standard components to protect boilers and maintain comfortable, energy-efficient temperatures.