Taco SR506-EXP-1 6-Zone Circulator Relay with Expansion Capabilities and Data Port Includes Priority

Original price was: $339.86.Current price is: $298.67.

7 in stock

SKU: 228949 Category:


Overall, the Taco SR506-EXP-1 offers a versatile and expandable control solution for managing multiple zones and a circulator pump in hydronic heating systems. Its priority function, timer and boiler options, compact design, and compatibility with various valve types make it a popular choice for both residential and commercial applications.


  • Manages water flow to 6 zones: Controls hot water circulation to individual zones in a hydronic heating system, ensuring efficient temperature control in different areas.
  • Activates and deactivates a circulator pump: Ensures continuous water circulation when needed, optimizing system performance.
  • Expandable for up to 120 zones: Can be linked with additional SR506-EXP units to accommodate larger systems with more zones.

Key Features:

  • 6-zone capacity (expandable to 120): Suitable for medium to large 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.
  • Built-in timer and boiler functions: Provides additional control options for optimizing system operation and energy efficiency.
  • 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.


  • Hydronic heating systems: Ideal for radiant, baseboard, or fan coil systems in residential and 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.

Additional Features:

  • Field-replaceable transformer: Facilitates easy maintenance if needed.
  • Universal thermostat compatibility: Works with a wide range of thermostats.
  • Fuse-protected: Ensures electrical safety.

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 6 zones, additional SR506-EXP units will be required.

Additional information

Weight 5.26 lbs


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