Zone Valves

Zone valves, actuators, dampers and panels for hydronic and forced-air zoning: 2-way and 3-way valves, fan coil valves, high-head models, replacement heads, zone dampers, forced-air panels and repair parts.

Zoning a hydronic system with valves instead of separate circulators is cheaper and simpler, but it changes the hydraulics: as zones close, flow through the remaining ones rises and the pump rides up its curve. That is why a valve-zoned system usually wants a pressure-bypass or a variable-speed circulator, and why a fixed-speed pump on a multi-zone valve system is often the source of velocity noise.

Most residential zone valves fail at the powerhead, not the valve body. Replacement heads are stocked separately and swap without draining the system, which is the cheap fix when a zone stops responding but the valve still moves by hand.

Connections are sweat, press, flare and FNPT in 1/2" through 1".

Brands include Resideo, Taco, Caleffi and Viega.

Popular part numbers: Honeywell V8043A1011, Honeywell V8043E1137, Honeywell 40003916-021, Honeywell VCZZ1100, Honeywell VU842A1046.

Taco Zone Sentry, QuickTop and 570 series valves are in Taco zone valves. For Taco pumps, switching relays and air vents, see Taco Comfort Solutions.

Frequently asked questions

Can I replace just the zone valve head?

Often, yes. If the valve body still opens and closes by hand, a replacement head fixes the zone without draining the system.

Normally open or normally closed?

A normally closed valve stays shut until the thermostat powers it open. A normally open valve stays open until it is powered closed. Match the old valve.

What does the end switch do?

The end switch closes when the valve is fully open and tells the boiler or circulator to run. Pick a valve with an end switch if the old one had one.

Are Honeywell and Resideo zone valves the same?

Yes. The V8043 and VC lines are now made by Resideo under the same numbers. See Honeywell Home and Resideo.