Resideo - Honeywell Home L8124C1003 Aquastat Relay

The L8124C1003 Aquastat Relay from Resideo–Honeywell Home is a precision control device designed for reliable hydronic heating systems. With a direct horizontal immersion well and a sensing element measuring 3/8 inch in diameter by 2-7/8 inches in length, this triple, high-limit unit delivers robust protection and accurate temperature control.

Key specs include SPST contact configuration, 1/2 inch conduit connections with quick-connect or screw options, and UL/CSA approvals for safe installation. Temperature ranges cover a high-limit of 130–240°F and a low-limit of 110–220°F, with a fixed high-limit differential of 10°F and an adjustable low-limit differential from 10 to 25°F to tailor performance to your system. Maximum temperature ratings are 150°F for the switch and 265°F for the sensing element.

Additional details include dimensions of 6-1/8" W x 3-1/16" D x 4-3/8" H, insulation depth of 1-1/2", and humidity tolerance from 0 to 95% RH non-condensing. Pressure ratings reach up to 200 PSI on the outside of the immersion well and 100 PSI if inserted directly as a capsule.

• SPST contact configuration
• Direct immersion well: 3/8" diameter x 2-7/8" length
• 1/2" conduit connections; quick-connect or screw
• High-limit 130–240°F; Low-limit 110–220°F
• UL/CSA approved
• Compact dimensions: 6-1/8" W × 3-1/16" D × 4-3/8" H