Taco ZVC404-EXP-4 4-Zone Valve Expandable Control with Circulator Relay and Transformer with Priority

Original price was: $228.76.Current price is: $187.63.

5 in stock

SKU: 296195 Category:


Overall, the Taco ZVC404-EXP-4 offers a compact, expandable, and multi-functional control solution for managing multiple zones and a circulator pump in hydronic heating systems. Its priority function, diagnostic lights, compatibility with various valve types, built-in transformer, and circulator relay make it a versatile choice for efficient and customizable temperature control.


  • Manages water flow to 4 zones in a hydronic heating system: Controls the opening and closing of zone valves to direct hot water to specific areas of your home, ensuring efficient zone-based temperature control.
  • Activates and deactivates a circulator pump: Ensures continuous water circulation when needed, optimizing system performance.
  • Expandable up to 20 zones: Can be linked with additional ZVC404-EXP units or other compatible Taco zone controls to accommodate larger systems with more zones.
  • Transforms voltage: The built-in transformer converts 120V household voltage to 24V for safe operation of zone valves and other low-voltage components.

Key Features:

  • 4-zone capacity (expandable): Suitable for small to medium multi-zone systems, with the flexibility to expand as needed.
  • Switchable priority: Prioritizes one zone over others, ensuring immediate comfort or addressing critical areas when activated.
  • External diagnostic lights: Facilitate troubleshooting by indicating system status and zone operation.
  • Compact design: Optimizes space utilization in control panels.
  • Compatible with various valve types: Works with 2-, 3-, or 4-wire zone valves for flexibility in system design.
  • Built-in circulator relay: Eliminates the need for a separate relay to control the circulator pump, simplifying wiring and installation.
  • Field-replaceable transformer: Facilitates easy maintenance if needed.
  • Universal thermostat compatibility: Works with a wide range of thermostats.
  • Fuse-protected: Ensures electrical safety.


  • Hydronic heating systems: Ideal for radiant, baseboard, or fan coil systems in residential and light commercial settings.
  • Closed cooling circuits: Can be used for zoned air conditioning systems.
  • Hydronic heating and cooling systems: Combines heating and cooling zones for year-round comfort.

Things to Consider:

  • System compatibility: Verify compatibility with your system’s voltage, control signals, and valve types.
  • Installation complexity: While DIY installation is possible, consulting a qualified professional is recommended for optimal performance and safety.
  • Expansion modules: If you need more than 4 zones, additional ZVC404-EXP units will be required.

Additional information

Weight 7.04 lbs


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