| Pipe Size | 1/2 in. |
| Connection Type | Flare |
| Body Pattern | Two-way, Straight-through |
| Valve Type | Zone Valve |
| Valve Action | Spring return to close |
| Actuation | Two position |
| De-energized Position | Normally Closed |
| Manual Opener | Yes |
| Capacity (Cv) | 3.5 Cv |
| Voltage | 24 Vac; Power Consumption--7.7 VA |
| Current Draw | 0.32A |
| Frequency | 50 Hz; 60 Hz |
| Electrical Connections | 18 in. leads |
| Timing | Nominal Open--15 sec |
| Close-off Pressure | 20 psi |
| Static Pressure | 125 psi |
| Fluid Temperature | 50 F to 200 F |
| Ambient Temperature | 125 F Maximum |
| Operating Humidity | 5 to 95% relative humidity, non-condensing. |
| Materials (Body) | Brass |
| Materials (Stem) | Stainless Steel |
| Materials (Seat) | Brass |
| Materials (Packing) | EPDM rubber |
| Materials (Plug/Ball/Disc) | Buna-N (NBR) Rubber Ball |
| Application | Hydronic Control |
| Dimensions | 4 in. high x 4 11/16 in. wide x 2 3/8 in. deep |
| UL | UL Listed: File MH11826 |
| CSA | CSA Certified: File 1310 |
Description
The V8043A1003 is a two-position hydronic zone valve from Resideo, the brand that carries the Honeywell Home line of residential heating controls. It pairs a motorized actuator with a 1/2-inch flare valve body to start and stop hot water flow to a single heating zone on a call from a thermostat or zone panel.
The valve is normally closed. It stays shut until the actuator is energized and returns to the closed position when power is removed, so a zone drops out on a power failure or a thermostat fault instead of running unattended. That is the safer default on a boiler loop feeding radiators, convectors, finned baseboard, or in-floor radiant tubing.
The 1/2-inch flare connections tie the valve into the supply piping, and the V8043A1003 handles supply water at operating pressures up to 300 psi.
The V8043 and V4043 series have been the reference zone valves in North American hydronic heating for decades, and most contractors still order them by the original Honeywell part number. The actuator head is field-replaceable, so a burned-out motor does not mean cutting the body out of the line.
Replacement head and motor for this valve
- Resideo 40003916-021/U 24 Vac, 50/60 Hz Replacement head for V8043A
- Resideo 40003916-521/U Replacement Head for V8043A, 5000 series, 24 V AC, 50/60 Hz
- Resideo 802360JA/U 24-Volt Replacement Motor for V8043 and V8044
- Brand: Resideo (Honeywell Home)
- Manufacturer Part #: V8043A1003/U
- Valve action: Normally closed
- Voltage: 24 Vac
- Connection size: 1/2 in
- Connection type: Flare
- Max operating pressure: 300 psi
- Category: Zone Valves