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Zone Valves

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  1. Hydronic Zone Valves 18
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Zone Valves

A zone valve is one of the most operationally critical components in any hydronic heating system, radiant floor heating loop, or forced hot water distribution network. It controls the flow of heated water to specific areas of a building, allowing independent temperature management across multiple rooms or floors without running the entire system at full capacity. 

At Plumbing Supply & More, we carry a professional-grade selection of zone valves from Taco, Honeywell, and Argo — three of the most trusted names in hydronic controls — covering everything from 2-way sweat valves to multi-zone control modules with circulator priority.

Whether you are installing a new hydronic heating system, replacing a failed actuator, or upgrading to a next-generation zone control panel, this category has the exact components you need to keep hot water moving where it belongs.

What Zone Valves Do in Hydronic & Radiant Heating Systems

Zone valves are motorized flow control devices that open and close in response to a thermostat signal, directing heated water through a specific circuit in a hydronic heating system. They eliminate the need for a dedicated circulator pump per zone, making them a cost-effective and space-saving alternative in multi-zone residential and light commercial heating applications. A properly specified zone valve reduces unnecessary heat loss, improves system efficiency, and gives occupants precise comfort control over individual spaces.

In a typical hydronic setup, each zone valve is wired to a low-voltage thermostat — most commonly at 24 VAC — and opens when there is a call for heat. Once open, an end-switch signal triggers the boiler and circulator to begin operation. When the zone reaches its set temperature, the thermostat closes the circuit, the valve returns to its normally closed position, and flow through that zone stops. This sequence repeats throughout the heating season with very little mechanical wear, making zone valves exceptionally durable and reliable.

Taco Zone Valves — Heat Motor, Hydronic & Zone Sentry Series

Taco is the leading manufacturer of zone valves for residential and commercial hydronic heating, and the products in this category reflect the full depth of their valve lineup. The Taco 571-4 is a 3/4" 2-way hydronic zone valve operating at 24 VAC with a Cv of 6.1, making it well-suited for standard residential hydronic baseboard circuits. The Taco 572-4 steps up to a 1" body with a Cv of 7, designed for slightly higher-flow systems with longer distribution loops or larger heating zones.

For applications that demand a larger pipe size, the Taco 573-2 offers a 1-1/4" 2-way heat motor zone valve at 24 V, addressing the flow requirements of commercial boiler zones or whole-house radiant systems. The Taco 570-2 rounds out this group as a 1/2" two-way sweat zone valve, ideal for smaller domestic heating circuits where compact installation space is a priority.

The Taco Zone Sentry Press-Zone Valve series — the Z075P2-2 and Z100P2-1 — represents a significant advancement in connection technology for hydronic zone control. Available in 3/4" and 1" sizes, these valves feature a press-fit end connection that eliminates the need for soldering during installation. Rated as normally closed, they are compatible with standard press tooling and deliver consistent, leak-free performance. Press-zone valves are particularly popular in renovation work and fast-paced commercial installs where torch work is restricted or simply undesirable.

The Taco 555-050RP is a heat motor zone valve assembly rated at 24 VAC and 125 psi, built for robust service in demanding hydronic applications. Heat motor valves use a thermal actuator to open the valve body rather than a gear-motor actuator, providing a slow, controlled opening action that minimizes water hammer and pressure surge in the system.

Honeywell Zone Valves — Sweat Connection & Low Voltage Models

Honeywell has long been a standard-setting name in low-voltage zone valves for forced hot water and steam heating, and their V8043 series remains one of the most widely installed zone valve lines in North America. At Plumbing Supply & More, we stock four core configurations of the Honeywell V8043 series: the 3/4" and 1" sweat zone valves available with either 18-inch pigtail leads or a terminal block connection.

The Honeywell V8043E1012/U (3/4", 18" leads) and V8043E1020/U (1", 18" leads) are direct wire models suited for retrofit installations where the existing wiring connects directly to the valve. The V8043F1036/U (3/4") and V8043F1051/U (1") feature a terminal block for cleaner, more serviceable wiring connections, making them the preferred choice in new construction and panel-controlled systems.

The Honeywell V8043E1061/U is a 3/4" 2-way low voltage zone valve operating at 24 VAC, engineered for precise, reliable service in multi-zone hydronic heating circuits. Its sweat end connection integrates directly into copper pipe distribution systems, and its compact actuator body fits in tight mechanical room configurations without compromising access for future servicing.

All Honeywell V8043 series valves operate on 24 VAC low voltage control circuits, are designed to work with standard heating thermostats, and include an end-switch that signals the boiler and circulator once the valve reaches the full-open position. This end-switch logic is fundamental to proper boiler sequencing in zone valve-controlled systems.

Zone Valve Control Modules — Taco ZVC Series & Argo Controllers

Zone valve control modules centralize the wiring, power transformation, and sequencing logic for all zones in a hydronic heating system into a single panel-mounted enclosure. Rather than wiring each zone valve's end-switch output directly to the boiler and circulator through a relay, a zone valve control module handles all of this logic internally, simplifying the electrical installation and improving system diagnostics.

The Taco ZVC403-4 is a 3-zone, 24 V control module designed for use with standard zone valves in residential hydronic systems. It includes a priority zone input, which is typically assigned to the domestic hot water (DHW) zone to ensure hot water priority over space heating. The Taco ZVC406-5 expands this capability to 6 zones at 120 V, making it the right choice for larger homes with multiple heating areas or buildings with more complex zone layouts.

The Taco ZVC403-5 is the next-generation version of the ZVC403-4, featuring updated electronics and improved reliability for 3-zone applications. It maintains the same priority zone functionality and compact panel-mount form factor while incorporating design improvements that reflect decades of field performance data.

The Argo Z297 and Z298 zone valve controllers offer a compelling alternative with built-in flexibility for either circulator priority or zone valve priority operation. The Z297 handles 4 zones and the Z298 expands to 6 zones, both featuring the ability to switch between control strategies without requiring external relays. Argo's controller design is particularly valued for retrofit projects where the existing system configuration may not perfectly match a standard priority wiring scheme.

Cv Rating, Pipe Size & Connection Type — Matching the Valve to Your System

Selecting the right zone valve requires matching three key parameters: the nominal pipe size, the flow coefficient (Cv), and the end connection type. The Cv rating represents the volume of water in gallons per minute that passes through the valve at a 1 psi pressure drop. A higher Cv means lower flow resistance, which is critical in longer or more complex hydronic loop configurations where pressure drop is already a design concern.

For 3/4" copper-piped baseboard systems with moderate loop lengths, a Cv of 6.1 — such as found in the Taco 571-4 — is more than adequate. Stepping to a 1" system with the Taco 572-4 and its Cv of 7 covers larger thermal loads without restricting flow. The connection type — whether sweat (solder), press-fit, or threaded — must align with the piping material and the installation method available on the jobsite.

Press-zone valves from the Taco Zone Sentry series eliminate open flame from the installation process entirely, which is not only faster but also required in certain jurisdictions and building types. Sweat valves from the Honeywell and Taco hydronic series remain the standard in traditional copper-piped systems where soldering is the preferred connection method.

Fan & Limit Controllers — Honeywell L4064B Series for Warm Air & Combination Systems

The Honeywell L4064B series insertion fan and limit controllers occupy a unique position in this category, serving as zone-level temperature control devices for forced warm air systems connected to hydronic or oil-fired heat exchangers. These controllers are inserted directly into the supply plenum or heat exchanger casing, where they monitor air temperature and control both the circulating fan and the high-limit safety cutoff.

The L4064B2210/U (11-1/2" insertion depth), L4064B2228/U (5" insertion depth), and L4064B2236/U (8" insertion depth) each operate with a 125°F fan-on setpoint, 100°F fan-off setpoint, and 200°F high-limit — the most common factory settings for residential warm air applications. The insertion length variation allows these controllers to be used across different furnace and heat exchanger cabinet sizes without sacrificing accurate temperature sensing.

These Honeywell fan and limit controls are an essential component in oil-fired furnaces, gas-fired warm air units, and combination heating systems where both hydronic and forced air distribution are present. Their inclusion alongside zone valves reflects the reality that many heating systems blend multiple distribution methods across different areas of a building.

Taco ZA024Q4A2 Replacement Actuator Head for Zone Sentry Valves

The Taco ZA024Q4A2 replacement actuator head is engineered specifically for the Taco Zone Sentry valve bodies, allowing field replacement of a failed or damaged actuator without disturbing the valve body itself or breaking into the piping system. This is a significant advantage in occupied buildings where system downtime must be minimized and where draining the heating circuit for a full valve replacement would be disruptive.

The actuator head connects to the valve body through a quick-disconnect mounting system, and replacement requires only basic hand tools. This design approach — separating the actuator from the hydraulic body — is considered a best practice in modern zone valve engineering because actuator components are subject to far more wear cycles than the brass or bronze valve body itself.

Keeping a replacement actuator head on the shelf is a smart practice for service contractors and facility managers who rely on Zone Sentry valves throughout a building. It transforms what could be an emergency multi-hour repair into a quick 15-minute swap, restoring heat to the affected zone with minimal disruption.

Zone Valve Wiring, 24 VAC Control Circuits & End-Switch Logic

Every zone valve in this catalog operates on a 24 VAC control circuit, which is the universal standard for low-voltage heating controls in North America. The 24 VAC signal originates from a 24 V transformer that is typically integrated into the zone valve control module or the boiler control panel. When a thermostat calls for heat, it closes a circuit that energizes the zone valve actuator.

The end-switch is the key feedback mechanism in zone valve-controlled systems. It is a small internal switch that closes only when the valve reaches the fully open position — typically after 60 to 90 seconds of motor travel. The end-switch output connects to the boiler's thermostat terminal or to the zone valve control module's call input, ensuring that the boiler fires only after the valve is confirmed open and flow is established. This prevents short-cycling, dry firing, and pressure surge events that can damage both the boiler and the distribution piping.

Zone valve control modules from Taco and Argo automate this end-switch sequencing for all zones simultaneously, eliminating the need for individual relays and simplifying commissioning. Understanding this wiring logic is essential for anyone specifying or troubleshooting a zone valve-based hydronic system.

Why Shop Zone Valves at Plumbing Supply & More?

Plumbing Supply & More has served heating, plumbing, and HVAC professionals for over 75 years as a family-owned wholesale distributor with deep expertise in hydronic heating components. Our zone valve inventory is sourced directly from Taco, Honeywell, and Argo — giving you access to genuine OEM products at competitive wholesale prices, not gray-market alternatives or substitutions.

We stock zone valves in the most commonly specified sizes and configurations — 1/2", 3/4", 1", and 1-1/4" — along with the zone valve control modules and replacement parts needed to complete any installation or service call in a single order. Free same-day shipping is available on most orders over $150, which means the components you need can be on the next truck without the typical distributor delays.

Whether you are a hydronic heating contractor, a facilities maintenance professional, or a homeowner managing a complex multi-zone system, Plumbing Supply & More gives you direct access to the products that professional installers specify and trust — at wholesale pricing backed by decades of industry expertise.

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