Switching Relays

We offer switching relays from the leading manufacturers TACO and Honeywell, at competitive prices. Switching Relays control the functioning of circulator Pumps.

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  • 1 Zone Switching Relay View Specs
    • SKU: SR501-4
    • Brand: Taco

    $49.85 / each

    $193.40 / box
    4 x $48.35

    In Stock! (527 Available) Ships in 24-48 Hrs
  • 2 Zone Switching Relay View Specs
    • SKU: SR502-4
    • Brand: Taco

    $114.95 / each

    $332.55 / box
    3 x $110.85

    In Stock! (203 Available) Ships in 24-48 Hrs
  • 3 Zone Switching Relay View Specs
    • SKU: SR503-4
    • Brand: Taco

    $124.95 / each

    $359.55 / box
    3 x $119.85

    In Stock! (492 Available) Ships in 24-48 Hrs
  • 4 Zone Switching Relay View Specs
    • SKU: SR504-4
    • Brand: Taco

    $174.95 / each

    $337.70 / box
    2 x $168.85

    In Stock! (325 Available) Ships in 24-48 Hrs
  • 6 Zone Switching Relay View Specs
    • SKU: SR506-4
    • Brand: Taco

    $202.95 / each

    $389.70 / box
    2 x $194.85

    In Stock! (127 Available) Ships in 24-48 Hrs
  • 3 Zone Switching Relay w/ Priority View Specs
    • SKU: SR503-EXP-4
    • Brand: Taco

    $159.95 / each

    $310.30 / box
    2 x $155.15

    In Stock! (221 Available) Ships in 24-48 Hrs
  • 1 Zone Switching Relay View Specs
    • SKU: SR501-EXP-4
    • Brand: Taco

    $103.95 / each

    In Stock! (355 Available) Ships in 24-48 Hrs
  • 4 Zone Switching Relay w/ Priority View Specs
    • SKU: SR504-EXP-4
    • Brand: Taco

    $188.95 / each

    $365.70 / box
    2 x $182.85

    In Stock! (81 Available) Ships in 24-48 Hrs
  • 6 Zone Switching Relay w/ Priority View Specs
    • SKU: SR506-EXP-4
    • Brand: Taco

    $218.55 / each

    $421.70 / box
    2 x $210.85

    In Stock! (103 Available) Ships in 24-48 Hrs
  • FuelMizer SR501-OR-4 Switching Relay with Outdoor Reset View Specs

    $159.95 / each

    $465.45 / box
    3 x $155.15

    In Stock! (23 Available) Ships in 24-48 Hrs
  • 24 Volt Replacement Relay View Specs
    • SKU: SR024-001RP
    • Brand: Taco

    $19.85 / each

    $115.50 / box
    6 x $19.25

    In Stock! (115 Available) Ships in 24-48 Hrs
  • 120 Volt Replacement Relay View Specs
    • SKU: SR120-001RP
    • Brand: Taco

    $19.85 / each

    In Stock! (54 Available) Ships in 24-48 Hrs
  • Universal Relay Replacement View Specs
    • SKU: SR501-845RP
    • Brand: Taco

    $40.45 / each

    In Stock! (19 Available) Ships in 24-48 Hrs
  • Taco Boiler Reset Control View Specs
    • SKU: PC700-2
    • Brand: Taco

    $257.95 / each

    In Stock! (21 Available) Ships in 24-48 Hrs
  • Taco Boiler Reset Control 2-Stage View Specs
    • SKU: PC702-1
    • Brand: Taco

    $272.95 / each

    In Stock! (3 Available) Ships in 24-48 Hrs
  • Taco PC705 Variable Speed Pump Control View Specs
    • SKU: PC705-2
    • Brand: Taco

    $296.95 / each

    In Stock! (5 Available) Ships in 24-48 Hrs
  • Replacement Fuse - 1 Amp (10 Pack) View Specs
    • SKU: SR1A-001RP
    • Brand: Taco

    $12.95 / each

    $125.50 / box
    10 x $12.55

    In Stock! (19 Available) Ships in 24-48 Hrs
  • Replacement Fuse - 5 Amp (10 Pack) View Specs
    • SKU: SR5A-005RP
    • Brand: Taco

    $12.95 / each

    $125.50 / box
    10 x $12.55

    In Stock! (39 Available) Ships in 24-48 Hrs
  • Universal Switching Relay w/ Internal Transformer View Specs
    • SKU: R8845U1003
    • Brand: Honeywell

    $47.25 / each

    $91.90 / box
    2 x $45.95

    In Stock! (81 Available) Ships in 24-48 Hrs
  • 2 Zone 120V Switching Relay with Dpst switching View Specs
    • SKU: RA832A1066
    • Brand: Honeywell

    $65.50 / each

    $255.80 / box
    4 x $63.95

    In Stock! (68 Available) Ships in 24-48 Hrs

More About Switching Relays

Switching relays are used to control the flow of water in a heating system by monitoring temperatures and adjusting boiler water temperature to match the demand. They are used in coordination with circulator pumps and programmable thermostats to control zoning in a hydronic heating system. This makes them ideal for indirect water heaters and priority zoning applications. They maximize efficiency and reduce fuel usage, which saves money. In addition, they provide intermediate switching of a line voltage device from a low voltage controller. Switching relays are available in one to six zone models, and if additional zones are required expandable models provide the ability to expand up to 20 zones.

We offer a wide selection of Taco, Honeywell , Argo, Bell & Gossett, and Erie switching relays for residential and light commercial applications.

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