Pros, Join Our TradeMaster Program!
  • 1 Zone Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    1 Zone Switching Relay SR501-4 1 Zone Switching Relay
    SKU: SR501-4 Taco
    SKU: SR501-4
    Brand: Taco
    (129)
    $62.50 each
    Not Added to List Icon Add to List
    Added to List Icon List
    1,709
    Tue, Nov 2
    2,412
    QtyArrives
    1,709 Tue, Nov 2
    703 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 3 Zone Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    3 Zone Switching Relay SR503-4 3 Zone Switching Relay
    SKU: SR503-4 Taco
    SKU: SR503-4
    Brand: Taco
    (40)
    $159.48 each
    Not Added to List Icon Add to List
    Added to List Icon List
    704
    Tue, Nov 2
    1,199
    QtyArrives
    704 Tue, Nov 2
    495 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 2 Zone Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    2 Zone Switching Relay SR502-4 2 Zone Switching Relay
    SKU: SR502-4 Taco
    SKU: SR502-4
    Brand: Taco
    (25)
    $149.10 each
    Not Added to List Icon Add to List
    Added to List Icon List
    608
    Tue, Nov 2
    1,315
    QtyArrives
    608 Tue, Nov 2
    707 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 4 Zone Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    4 Zone Switching Relay SR504-4 4 Zone Switching Relay
    SKU: SR504-4 Taco
    SKU: SR504-4
    Brand: Taco
    (129)
    $197.00 each
    Not Added to List Icon Add to List
    Added to List Icon List
    449
    Tue, Nov 2
    684
    QtyArrives
    449 Tue, Nov 2
    235 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 6 Zone Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    6 Zone Switching Relay SR506-4 6 Zone Switching Relay
    SKU: SR506-4 Taco
    SKU: SR506-4
    Brand: Taco
    (129)
    $252.00 each
    Not Added to List Icon Add to List
    Added to List Icon List
    254
    Tue, Nov 2
    394
    QtyArrives
    254 Tue, Nov 2
    140 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 2 Zone 120V Switching Relay w/ DPST Switching Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    2 Zone 120V Switching Relay w/ DPST Switching RA832A1066 2 Zone 120V Switching Relay w/ DPST Switching
    SKU: RA832A1066 Resideo
    SKU: RA832A1066
    Brand: Resideo
    (31)
    $84.99 each
    Not Added to List Icon Add to List
    Added to List Icon List
    474
    Tue, Nov 2
    474
    QtyArrives
    474 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 4 Zone Switching Relay<br>w/ Priority Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    4 Zone Switching Relay w/ Priority SR504-EXP-4 4 Zone Switching Relay w/ Priority
    SKU: SR504-EXP-4 Taco
    SKU: SR504-EXP-4
    Brand: Taco
    (31)
    $206.00 each
    Not Added to List Icon Add to List
    Added to List Icon List
    Tue, Nov 30 – Thu, Dec 30
    Arrives
    Tue, Nov 30 – Thu, Dec 30
    Questions? Call 1-888-757-4774 or
    Not Added to List Icon Add to List
    Added to List Icon List
  • 6 Zone Switching Relay<br>w/ Priority Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    6 Zone Switching Relay w/ Priority SR506-EXP-4 6 Zone Switching Relay w/ Priority
    SKU: SR506-EXP-4 Taco
    SKU: SR506-EXP-4
    Brand: Taco
    (13)
    $261.00 each
    Not Added to List Icon Add to List
    Added to List Icon List
    35
    Tue, Nov 2
    196
    QtyArrives
    35 Tue, Nov 2
    161 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 3 Zone Switching Relay<br>w/ Priority Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    3 Zone Switching Relay w/ Priority SR503-EXP-4 3 Zone Switching Relay w/ Priority
    SKU: SR503-EXP-4 Taco
    SKU: SR503-EXP-4
    Brand: Taco
    (31)
    $164.23 each
    Not Added to List Icon Add to List
    Added to List Icon List
    56
    Tue, Nov 2
    108
    QtyArrives
    56 Tue, Nov 2
    52 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST RA89A1074 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST
    SKU: RA89A1074 Resideo
    SKU: RA89A1074
    Brand: Resideo
    (21)
    $66.59 each
    Not Added to List Icon Add to List
    Added to List Icon List
    249
    Tue, Nov 2
    249
    QtyArrives
    249 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • Switching Relay w/ Internal Transformer DPST Line Voltage Relays Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    Switching Relay w/ Internal Transformer DPST Line Voltage Relays R845A1030 Switching Relay w/ Internal Transformer DPST Line Voltage Relays
    SKU: R845A1030 Resideo
    SKU: R845A1030
    Brand: Resideo
    (9)
    $83.99 each
    Not Added to List Icon Add to List
    Added to List Icon List
    199
    Tue, Nov 2
    199
    QtyArrives
    199 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • Replacement Fuse - <br>5 Amp (10 Pack) Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    Replacement Fuse - 5 Amp (10 Pack) SR5A-005RP Replacement Fuse - 5 Amp (10 Pack)
    SKU: SR5A-005RP Taco
    SKU: SR5A-005RP
    Brand: Taco
    (3)
    $14.72 each
    Not Added to List Icon Add to List
    Added to List Icon List
    140
    Tue, Nov 2
    270
    QtyArrives
    140 Tue, Nov 2
    130 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • Replacement Fuse - <br>6 Amp (10 Pack) Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    Replacement Fuse - 6 Amp (10 Pack) SR6A-001RP Replacement Fuse - 6 Amp (10 Pack)
    SKU: SR6A-001RP Taco
    SKU: SR6A-001RP
    Brand: Taco
    (5)
    $18.99 each
    Not Added to List Icon Add to List
    Added to List Icon List
    191
    Tue, Nov 2
    270
    QtyArrives
    191 Tue, Nov 2
    79 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • Universal Switching Relay w/ Internal Transformer Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    Universal Switching Relay w/ Internal Transformer R8845U1003 Universal Switching Relay w/ Internal Transformer
    SKU: R8845U1003 Resideo
    SKU: R8845U1003
    Brand: Resideo
    (20)
    $63.99 each
    Not Added to List Icon Add to List
    Added to List Icon List
    245
    Tue, Nov 2
    245
    QtyArrives
    245 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 2 Zone Pump Controller Switching Relay with Priority Protection Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    2 Zone Pump Controller Switching Relay with Priority Protection SP-82 2 Zone Pump Controller Switching Relay with Priority Protection
    SKU: SP-82 Azel Technologies
    SKU: SP-82
    Brand: Azel Technologies
    (9)
    $103.95 each
    Not Added to List Icon Add to List
    Added to List Icon List
    31
    Tue, Nov 2
    31
    QtyArrives
    31 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 3 Zone Pump Controller Switching Relay with Priority Protection Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    3 Zone Pump Controller Switching Relay with Priority Protection SP-83 3 Zone Pump Controller Switching Relay with Priority Protection
    SKU: SP-83 Azel Technologies
    SKU: SP-83
    Brand: Azel Technologies
    (8)
    $125.95 each
    Not Added to List Icon Add to List
    Added to List Icon List
    49
    Tue, Nov 2
    49
    QtyArrives
    49 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 6 Zone Expandable Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    6 Zone Expandable Switching Relay ARM6P 6 Zone Expandable Switching Relay
    SKU: ARM6P Argo
    SKU: ARM6P
    Brand: Argo
    (37)
    $273.50 each
    Not Added to List Icon Add to List
    Added to List Icon List
    108
    Tue, Nov 2
    108
    QtyArrives
    108 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 4 Zone Expandable Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    4 Zone Expandable Switching Relay ARM4P 4 Zone Expandable Switching Relay
    SKU: ARM4P Argo
    SKU: ARM4P
    Brand: Argo
    (37)
    $249.28 each
    Not Added to List Icon Add to List
    Added to List Icon List
    141
    Tue, Nov 2
    141
    QtyArrives
    141 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 1 Zone Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    1 Zone Switching Relay AR822II 1 Zone Switching Relay
    SKU: AR822II Argo
    SKU: AR822II
    Brand: Argo
    (6)
    $61.91 each
    Not Added to List Icon Add to List
    Added to List Icon List
    226
    Tue, Nov 2
    226
    QtyArrives
    226 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 24v Replacement Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    24v Replacement Relay SR024-001RP 24v Replacement Relay
    SKU: SR024-001RP Taco
    SKU: SR024-001RP
    Brand: Taco
    (8)
    $24.84 each
    Not Added to List Icon Add to List
    Added to List Icon List
    134
    Tue, Nov 2
    248
    QtyArrives
    134 Tue, Nov 2
    114 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT) Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT) SP-81 1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT)
    SKU: SP-81 Azel Technologies
    SKU: SP-81
    Brand: Azel Technologies
    (5)
    $53.75 each
    Not Added to List Icon Add to List
    Added to List Icon List
    25
    Tue, Nov 2
    25
    QtyArrives
    25 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • 3 Zone Expandable Switching Relay Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    3 Zone Expandable Switching Relay ARM3P 3 Zone Expandable Switching Relay
    SKU: ARM3P Argo
    SKU: ARM3P
    Brand: Argo
    (37)
    $195.80 each
    Not Added to List Icon Add to List
    Added to List Icon List
    202
    Tue, Nov 2
    202
    QtyArrives
    202 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • Isolation Relay<br>(Up to 3 Zones) Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    Isolation Relay (Up to 3 Zones) IR882 Isolation Relay (Up to 3 Zones)
    SKU: IR882 Argo
    SKU: IR882
    Brand: Argo
    (16)
    $76.17 each
    Not Added to List Icon Add to List
    Added to List Icon List
    63
    Tue, Nov 2
    63
    QtyArrives
    63 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
  • UPZCP-1 Single Zone Pump Control  Product Image
    Not Added to List Icon Add to List
    Added to List Icon List
    UPZCP-1 Single Zone Pump Control 98996400 UPZCP-1 Single Zone Pump Control
    SKU: 98996400 Grundfos
    SKU: 98996400
    Brand: Grundfos
    (3)
    $64.99 each
    Not Added to List Icon Add to List
    Added to List Icon List
    57
    Tue, Nov 2
    57
    QtyArrives
    57 Tue, Nov 2
    Questions? Call 1-888-757-4774
    Not Added to List Icon Add to List
    Added to List Icon List
FAQs, Manuals & Videos

Resources

Videos

Articles

  • 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, and Bell & Gossett switching relays for residential and light commercial applications.
  • Product Image

  • Product Image

    Select 2 to 3 items to compare

  • Product Image

    Compare up to 1 more item

Why don't we show the price of this item?

We try to always offer you the lowest prices possible, but some manufacturers require that we only show these low prices once you take further action.

To see the price, simply add the item to your cart or sign in.