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

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

the 100167793 helps minimize cycling wear and optimizes energy consumption across residential and light commercial applications

Proper installation requires inspecting the pump gaskets and checking the electrical terminal box orientation for terminal block clearance

the standard mounting footprint and screw terminal connections facilitate a streamlined HVAC contactor replacement process in the field

Resideo HPSR104 Switching Relay L99H008 reducing the 1-inch gas portThe 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