Taco SR504-4 4-Zone Circulator Relay

Original price was: $258.74.Current price is: $219.73.

37 in stock

SKU: 917849 Category:


The Taco SR504-4 4-Zone Circulator Relay is a popular choice for controlling hot water circulation in multi-zone hydronic heating systems. Here’s a breakdown of its key features and benefits:


  • 4-zone control: Independently controls the circulation pumps for up to four separate heating zones.
  • Switchable priority: Allows you to prioritize hot water flow to a specific zone, such as a living area, during peak demand.
  • External indicator lights: Provide instant visual feedback on the operating status of each zone.
  • Simplified wiring: Contractor-friendly design with clearly labeled PCB layout simplifies installation and troubleshooting.
  • Fully enclosed snap-out relays: Offer easy access for maintenance and replacement.
  • Compact size: Fits conveniently in most standard boiler or mechanical rooms.
  • Fuse protected: Ensures safety and protects the relay from electrical surges.
  • 100% factory tested: Guarantees reliable performance and minimizes the risk of malfunction.


  • Improves heating comfort: Provides precise control over hot water circulation in each zone, ensuring consistent and comfortable temperatures throughout your home.
  • Enhances system efficiency: Priority zoning prioritizes heating for occupied zones, reducing energy consumption and unnecessary pump operation.
  • Simplifies system monitoring: External indicator lights offer quick and easy status checks for each zone.
  • Reduces maintenance needs: Snap-out relays facilitate convenient access for maintenance and repairs.
  • Easy installation: Contractor-friendly design and clearly labeled components streamline the installation process.
  • Durable and reliable: Robust construction and factory testing ensure long-lasting performance and minimal downtime.

Things to consider:

  • System compatibility: Ensure the SR504-4 is compatible with your existing boiler and circulator pumps.
  • Wiring requirements: Follow the installation manual for proper wiring and connections to avoid electrical hazards.
  • Zone configuration: Plan the layout of your heating zones and prioritize the zone that needs hot water first.
  • Professional installation: While generally straightforward, consider seeking professional assistance for complex systems or if unfamiliar with electrical work.

Overall, the Taco SR504-4 4-Zone Circulator Relay is a valuable addition to multi-zone hydronic heating systems. Its precise control, simplified wiring, and reliable performance make it a popular choice for homeowners and professionals alike.

Additional information

Weight 4.96 lbs


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