TacoSKU: 1775050

Taco SR504-5 Next Generation 4-Zone Switching Relay with Priority

$270.96
In stock (12)

The Taco SR504-5 is the Next Generation 4-zone switching relay built for hydronic heating professionals who need reliable, flexible zoning control from a single enclosure. A direct replacement for the legacy SR504, this relay brings advanced timer and boiler relay functions, Bluetooth® app-based configuration, and full mod-con boiler support — all in Taco's most contractor-friendly board layout to date.

Whether you're wiring a straightforward residential baseboard system or commissioning a multi-zone radiant project, the SR504-5 accommodates both with DIP switch configuration or the Taco Control mobile app for full wireless customization and firmware updates in the field. External LED diagnostic lights give instant status feedback at startup and on service calls, cutting troubleshooting time significantly.

Shipping policy

Orders placed by 2:00pm EST will ship same day, except on holidays.

More Details

Product overview

• 4 zones with priority: switchable DHW or priority zone control with built-in priority protection
• Next Generation design: direct replacement for the legacy Taco SR504; backward-compatible wiring
• Bluetooth® app-enabled: wireless configuration and firmware updates via the Taco Control mobile app
• LED diagnostic lights: front-panel indicators on all outputs for instant status monitoring at startup and service
• Two boiler contacts: supports full mod-con boiler functionality including modulation and condensing modes
• Switchable primary circulator output: added flexibility for primary/secondary and other system designs
• Expandable to 120 zones: link up to 20 panels (120 zones using all SR506-5 panels)
• Post-purge and pump exercise functions: built-in to protect system components and maintain efficiency
• DHW recirculation SmartPlus® logic: intelligent domestic hot water recirculation control
• Four programmable relay outputs: customize system behavior without additional controls
• Fully enclosed snap-out relays: field-replaceable without tools
• Universal thermostat compatibility: works with conventional, programmable, and WiFi/smart thermostats (24V)
• Modbus communication support: integrates with building automation systems
• Fuse protected: added system safety; clearly labeled contractor-friendly PC board layout
• UL listed: 100% factory tested; extended 3-year warranty
• Professional installation required
Specifications
Manufacturer Part Number SR504-5
UPC n/a
Overall Dimensions 12-1/2" W × 8-1/2" H × 2-5/8" D
Material n/a
Domestic or Import n/a
End Style n/a
Type n/a
ADA Compliance n/a
Warning Professional installation required
Standards and Approvals UL Listed
Resources
Delivery & Returns

Orders will ship same day if received by 2pm EST.

Upcoming holiday closures: July 3, 2026

All returns are inspected on receipt; credit is issued after condition is confirmed. Credit is issued only for items returned in original, saleable condition after inspection.

FINAL SALE ITEMS ARE NOT ELIGIBLE FOR RETURNS OR EXCHANGES.

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