The Honeywell V8043G1109 is a reliable, two-position zone valve engineered for hydronic heating and cooling systems where precise flow control is essential. Featuring a 3/4″ NPT connection, this normally closed valve opens on a call for heating or cooling and spring-returns to the closed position upon power loss — providing fail-safe operation and protecting your system from unintended flow.
Key Features
- 3/4″ NPT sweat connections for straightforward installation in hydronic piping
- 24 VAC operating voltage — compatible with standard low-voltage zone control systems
- Normally Closed (NC) operation — valve opens on demand, closes on spring return
- 15-second nominal opening time for responsive zone control
- 3.5 Cv flow coefficient for balanced hydronic performance
- 20 PSI maximum differential pressure (closeoff) for dependable shutoff
- 18″ leadwires for flexible wiring connections in tight mechanical spaces
- Spring return to close — fail-safe design ensures valve closes on power loss
- Normally Open SPST auxiliary switch — signals the boiler or air handler when the zone valve is open
- Manual opener allows the valve to be opened without electrical power for system testing or commissioning
Specifications
- SKU: V8043G1109
- Brand: Honeywell
- Connection Size: 3/4″ NPT
- Voltage: 24 VAC
- Valve Action: Normally Closed
- Opening Time: 15 seconds (nominal)
- Flow Coefficient (Cv): 3.5
- Maximum Differential Pressure (Closeoff): 20 PSI
- Leadwire Length: 18″
- Return Mechanism: Spring Return to Close
- Auxiliary Switch: Normally Open SPST
- Manual Override: Yes — Manual Opener included
Applications
- Residential and light commercial hydronic heating systems
- Hot water baseboard and radiant floor heating zone control
- Multi-zone boiler systems requiring end-switch boiler activation
- Chilled water cooling distribution systems
The V8043G1109’s SPST auxiliary switch is a standout feature, enabling the zone valve to send an end-switch signal to the boiler or circulator pump — eliminating the need for a separate relay in many installations. The included manual opener is ideal for commissioning, troubleshooting, and balancing without requiring power to the valve. Built to Honeywell’s exacting standards, this zone valve delivers long service life and dependable performance in demanding hydronic applications.
