Resideo - Honeywell Home L8124L1011 Aquastat Relay

Aquastat Relay from Resideo—Honeywell Home L8124L1011 delivers precise control for hydronic heating systems. Engineered for direct horizontal immersion in a sensing well, this robust unit combines high-limit safety with an adjustable low-limit to protect boilers and ensure efficient operation.

Key specifications include a wide operating range and durable construction: high-limit 130–240°F, low-limit 110–220°F; maximums of 150°F (switch) and 265°F (sensing element). The SPST contact handles 7.4 A at 120V AC / 3.7 A at 240V AC full load (44.4 A at 120V / 22.2 A at 240V locked rotor). Connection is via 1/2 inch conduit with quick-connect or screw terminals. Overall dimensions are 6-1/8" W x 3-1/16" D x 4-3/8" H. The unit is rated for 200 psi outside the immersion well and 100 psi if inserted directly as a capsule, and operates in 0–95% RH non-condensing environments. UL and CSA approvals ensure compliance with safety standards.

• Direct horizontal immersion well for reliable sensing
• Sensing element: Type 3/8 inch diameter x 2-7/8 inch length
• Triple high-limit protection with adjustable low-limit
• SPST contact configuration for simple on/off control
• 1/2 inch conduit connections with quick-connect or screw terminals
• Wide temperature ranges and robust electrical ratings
• UL and CSA approvals for safety and compliance
• Compact dimensions: 6-1/8" W x 3-1/16" D x 4-3/8" H
• Pressure ratings: 200 psi (immersion well) / 100 psi (capsule)
• Humidity tolerance: 0–95% RH non-condensing