The pilot-operated mechanism ensures consistent operation even at low pressure differentials

preventing bypass leaks and maintaining the required static pressure for efficient humidification

reducing the 1-inch gas port may restrict fuel flow and impact the Raypak boiler's ability to reach its rated BTU capacity

Key Benefits Factory-Matched Calibrations: Features a 160-180 degree operating range to maintain strict adherence to original equipment specifications

Durable Construction: Lightweight yet rugged aluminum housing provides long-lasting service in industrial settings

Resideo HPSR104 Switching Relay L99H008 The pilot-operated mechanism ensures consistentThe Resideo HPSR104 is a robust four zone switching relay designed for professional hydronic applications. This 120V pump zoning panel provides precise control for up to four circulator pumps, integrating a dedicated priority zone for domestic hot water (DHW) calls. Engineered for versatility, it is fully compatible with most thermostats, including power stealing, electromechanical, and modern smart thermostats like the T6 Pro. Each thermostat