Hydronic Circulator Switching Relay

Circulator Pump Relay. Pump Zone Controls in Hydronic and Radiant Heat Applications. Taco, Azel and Heat Timer pump relays used for many types of hydronic heating systems when you want to control on and off function of pumps. Only the Heat Timer 926577-00 will also work with zone valves - Taco and Azel Pump Controllers only work with pumps.