A Diverter Valve is a three-port hydronic component that directs flow to multiple circuits or zones based on temperature sensors or thermostatic control signals. These valves route hot water between heating zones, buffer tanks, and priority loads. Diverter valves enable system flexibility without requiring multiple pumps.
Valve Types and Operation
Zone diverter valves route 100 percent of flow to either zone A or zone B, then progressively blend when both zones require heating. Thermostatic models respond to water temperature changes without electronic controls. Motorized diverter valves accept 24-volt signals from zone thermostats or system controllers. Flow capacity ranges from 10 to 60 gallons per minute for residential systems.
Installation Applications
Diverter valves mount near the boiler to prioritize domestic hot water heating over space heating. They reduce standby losses by isolating unoccupied zones. Proper installation with check valves prevents backflow and ensures one-way circulation paths. Combination with thermostatic mixing valves maintains safe outlet temperatures of 120-140 degrees Fahrenheit.