the ESP200 solid-state design is self-powered from the main circuit

which corresponds to the 5/8" nominal size used in standard plumbing

Common indicators include grinding noises from worn motor bearings

Chemical Resistance: Equipped with EPR (Ethylene Propylene Rubber) elastomers

Rugged Construction: Features a cast-iron frame and ball bearings for reliable performance during peak summer thermal loads

Resideo R845A1030 Relay 320734-701 the ESP200 solid-state design isThe Resideo R845A1030 functions as a mission critical hydronic switching relay designed for demanding multi zone boiler applications. This DPST switching relay features an integral transformer providing 24Vac current to power two wire or three wire thermostats, including modern Smart Thermostats with C wire requirements. The double pole single throw configuration allows for simultaneous control of a line voltage circulator pump and a low voltage