In a hydronic heating system, a three-way valve can direct hot water between which components?

In a hydronic heating system, a three-way valve can direct hot water between which components?

• A. Condenser, evaporator, and expansion valve
• B. Boiler, domestic hot water coil, and load
• C. Radiator, thermostat, and pump
• D. Boiler, air handler, and vent

Answer: (B)

A three-way valve in a hydronic heating system is used to route hot water from the boiler to different destinations, typically between the space-heating loop (radiators or baseboards) and a domestic hot water coil, depending on demand. This capability to direct hot water to both the heating load and the domestic hot water coil makes the option describing the boiler, the domestic hot water coil, and the load the best fit. The other choices pull in components from refrigeration cycles or describe configurations that don’t reflect how a hydronic three-way valve directs hot water between those specific destinations.

A three-way valve in a hydronic heating system is used to route hot water from the boiler to different destinations, typically between the space-heating loop (radiators or baseboards) and a domestic hot water coil, depending on demand. This capability to direct hot water to both the heating load and the domestic hot water coil makes the option describing the boiler, the domestic hot water coil, and the load the best fit. The other choices pull in components from refrigeration cycles or describe configurations that don’t reflect how a hydronic three-way valve directs hot water between those specific destinations.