Resideo - Honeywell Home L8124A1007 Hydronic Control Relay

Hydronic Control Relay from Resideo–Honeywell Home L8124A1007 combines high-limit protection with low-limit and circulation control for reliable domestic hydronic heating. This multi-function control uses SPST (High Limit) and SPDT (Low Limit and Circulation Control) to safeguard temps while delivering smooth operation.

Designed for 120V AC operation at 60 Hz, it handles hot water media with rugged UL and CSA certification. Its compact vertical mount fits standard hydronic installations, with quick-connect or screw terminations and dimensions of 4-3/8" W x 3-1/16" D x 6-1/8" H. Temperature ratings cover high limit (130–240°F) and low limit (110–220°F), while a 200 psi immersion well supports durability in active systems. The diaphragm powerhead provides precise, responsive control, and the unit offers adjustable low-limit differential (10–25°F) alongside a fixed high-limit differential (10°F).

• Multi-function safety and control: High Limit Protection, Low Limit and Circulation Control
• Reliability: UL and CSA certified, designed for domestic hydronic heating systems
• Electrical & connections: 120V AC, 60 Hz; Quick Connect or Screw Terminations; full-load ratings and locked-rotor specs
• Durability: 200 psi immersion well; 1-1/2" insulation depth; vertical mounting

Ideal for upgrading or replacing aging hydronic controls, it ensures dependable heat management and system efficiency.