Resideo - Honeywell Home L8124E1016 Hydronic Control Relay

The L8124E1016 Hydronic Control Relay from Resideo Honeywell Home is a compact, multi-function relay designed for domestic hot-water hydronic systems. This triple-function unit combines an SPST high-limit switch with a diaphragm powerhead to deliver reliable high-limit protection and precise control of heating operation.

Engineered for 120V AC at 60 Hz, it supports a broad 130–240°F high-limit range and a 200 PSI immersion well for safe hot-water media handling. The rugged relay is UL/CSA listed and designed for vertical mounting with flexible quick-connect or screw terminations, simplifying installation and service. Its differential options include a fixed 10°F high-limit and an adjustable 10–25°F low-limit to tailor protection to your system. Ambient ratings reach 150°F for the case and 265°F for the sensing element, with a wide humidity tolerance (0–95% RH non-condensing).

• Triple-function hydronic relay for domestic heating systems
• SPST high-limit switch with diaphragm powerhead for protection
• Input: 120V AC, 60 Hz; full-load currents: 7.4A (120V) / 3.7A (240V)
• Immersion well rated to 200 PSI; handles hot water media
• UL/CSA listed for safety and reliability
• Vertical mounting with quick-connect or screw terminations
• Compact dimensions: 4-3/8" W x 3-1/16" D x 6-1/8" H
• Differential: 10°F high-limit (fixed); 10–25°F low-limit (adjustable)