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Switching Relays can control system or zone valve circulator which is easy to install and set and will not affect boiler’s warranty.
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Taco FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset Taco FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset

  • Taco FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset
  • Full outdoor boiler reset control
  • Can control system or zone valve circulator
  • Over-ride of outdoor reset when DHW tank is calling
  • Easy to install and set; will not affect boiler’s warranty
  • Front mounted LED lights for full diagnostic information
  • Ideal for retrofit applications of just about any hot water boiler

Usually Ships in 24 Hours
List Price: $234.50
Our Low Price: 159.95
2 in stock!
Taco SR501-4 Switching Relay - 1 Zone Taco SR501-4 Switching Relay - 1 Zone

  • Taco SR501-4 Switching Relay
  • 1 Zone Relay
  • Universal Replaceability
  • Snap-in PC Board
  • Simplified Wiring
  • Fully Enclosed Snap-Out Relays
  • External Indicator Lights
  • Fuse Protected (with spare)

Usually Ships in 24 Hours
List Price: $89.10
Our Low Price: 51.95
3 in stock!
Taco SR501-HC-4 Switching Relay High Capacity - 1 Zone Taco SR501-HC-4 Switching Relay High Capacity - 1 Zone

  • Taco SR501-HC-4 Switching Relay High Capacity
  • 1 or 2 Zones
  • High Capacity
  • Snap-in PC Board
  • Simplified Wiring
  • Fully Enclosed Snap-Out Relays
  • External Indicator Lights
  • Fuse Protected (with spare)

Usually Ships in 24 Hours
List Price: $129.50
Our Low Price: 89.95
2 in stock!
Taco SR502-4 Switching Relay - 2 Zone Taco SR502-4 Switching Relay - 2 Zone

  • Taco SR502-4 Switching Relay
  • 2 Zone Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected

Usually Ships in 24 Hours
List Price: $211.00
Our Low Price: 114.95
4 in stock!
Taco SR503-4 Switching Relay - 3 Zone Taco SR503-4 Switching Relay - 3 Zone

  • Taco SR503-4 Switching Relay
  • 3 Zone Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected

Usually Ships in 24 Hours
List Price: $228.50
Our Low Price: 124.95
3 in stock!
Taco SR504-4 Switching Relay - 4 Zone Taco SR504-4 Switching Relay - 4 Zone

  • Taco SR504-4 Switching Relay
  • 4 Zone Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected

Usually Ships in 24 Hours
List Price: $254.50
Our Low Price: 154.95
3 in stock!
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Taco SR506-4 Switching Relay - 6 Zone with Priority Taco SR506-4 Switching Relay - 6 Zone with Priority

  • Taco SR506-4 Switching Relay 6 Zone Relay
  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected
  • 100% Factory Tested
  • Isolated End Switch
  • 3 Year Warranty
  • Made in the USA

Usually Ships in 24 Hours
List Price: $374.00
Our Low Price: 202.95
3 in stock!