Pros, Join Our TradeMaster Program!
  • 1 Zone Switching Relay Product Image
    Add to List
    Add to List
    1 Zone Switching Relay SR501-4 1 Zone Switching Relay
    SKU: SR501-4
    Brand: Taco
    (126)
    $60.00 each
    457
    Wed, Jan 27
    1,970
    QtyArrives
    457 Wed, Jan 27
    1,513 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 2 Zone Switching Relay Product Image
    Add to List
    Add to List
    2 Zone Switching Relay SR502-4 2 Zone Switching Relay
    SKU: SR502-4
    Brand: Taco
    (25)
    $142.00 each
    234
    Wed, Jan 27
    1,035
    QtyArrives
    234 Wed, Jan 27
    801 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 3 Zone Switching Relay Product Image
    Add to List
    Add to List
    3 Zone Switching Relay SR503-4 3 Zone Switching Relay
    SKU: SR503-4
    Brand: Taco
    (39)
    $150.00 each
    245
    Wed, Jan 27
    584
    QtyArrives
    245 Wed, Jan 27
    339 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 4 Zone Switching Relay Product Image
    Add to List
    Add to List
    4 Zone Switching Relay SR504-4 4 Zone Switching Relay
    SKU: SR504-4
    Brand: Taco
    (126)
    $182.00 each
    153
    Wed, Jan 27
    529
    QtyArrives
    153 Wed, Jan 27
    376 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 6 Zone Switching Relay Product Image
    Add to List
    Add to List
    6 Zone Switching Relay SR506-4 6 Zone Switching Relay
    SKU: SR506-4
    Brand: Taco
    (126)
    $240.00 each
    112
    Wed, Jan 27
    405
    QtyArrives
    112 Wed, Jan 27
    293 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 2 Zone 120V Switching Relay with DPST switching Product Image
    Add to List
    Add to List
    2 Zone 120V Switching Relay with DPST switching RA832A1066 2 Zone 120V Switching Relay with DPST switching
    SKU: RA832A1066
    Brand: Honeywell
    (30)
    $79.68 each
    478
    Wed, Jan 27
    478
    QtyArrives
    478 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 6 Zone Switching Relay<br>w/ Priority Product Image
    Add to List
    Add to List
    6 Zone Switching Relay w/ Priority SR506-EXP-4 6 Zone Switching Relay w/ Priority
    SKU: SR506-EXP-4
    Brand: Taco
    (13)
    $248.00 each
    96
    Wed, Jan 27
    232
    QtyArrives
    96 Wed, Jan 27
    136 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 4 Zone Switching Relay<br>w/ Priority Product Image
    Add to List
    Add to List
    4 Zone Switching Relay w/ Priority SR504-EXP-4 4 Zone Switching Relay w/ Priority
    SKU: SR504-EXP-4
    Brand: Taco
    (31)
    $190.00 each
    123
    Wed, Jan 27
    391
    QtyArrives
    123 Wed, Jan 27
    268 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 3 Zone Switching Relay<br>w/ Priority Product Image
    Add to List
    Add to List
    3 Zone Switching Relay w/ Priority SR503-EXP-4 3 Zone Switching Relay w/ Priority
    SKU: SR503-EXP-4
    Brand: Taco
    (31)
    $158.00 each
    104
    Wed, Jan 27
    549
    QtyArrives
    104 Wed, Jan 27
    445 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST Product Image
    Add to List
    Add to List
    1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST RA89A1074 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST
    SKU: RA89A1074
    Brand: Honeywell
    (18)
    $60.99 each
    284
    Wed, Jan 27
    284
    QtyArrives
    284 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • Switching Relay w/ Internal Transformer DPST Line Voltage Relays Product Image
    Add to List
    Add to List
    Switching Relay w/ Internal Transformer DPST Line Voltage Relays R845A1030 Switching Relay w/ Internal Transformer DPST Line Voltage Relays
    SKU: R845A1030
    Brand: Honeywell
    (9)
    $77.99 each
    225
    Wed, Jan 27
    225
    QtyArrives
    225 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • Replacement Fuse - <br>5 Amp (10 Pack) Product Image
    Add to List
    Add to List
    Replacement Fuse - 5 Amp (10 Pack) SR5A-005RP Replacement Fuse - 5 Amp (10 Pack)
    SKU: SR5A-005RP
    Brand: Taco
    (3)
    $14.29 each
    61
    Wed, Jan 27
    61
    QtyArrives
    61 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • Replacement Fuse - <br>6 Amp (10 Pack) Product Image
    Add to List
    Add to List
    Replacement Fuse - 6 Amp (10 Pack) SR6A-001RP Replacement Fuse - 6 Amp (10 Pack)
    SKU: SR6A-001RP
    Brand: Taco
    (5)
    $17.84 each
    94
    Wed, Jan 27
    165
    QtyArrives
    94 Wed, Jan 27
    71 Fri, Jan 29 – Mon, Feb 1
    Questions? Call 1-888-757-4774
    Add to List
  • Universal Switching Relay w/ Internal Transformer Product Image
    Add to List
    Add to List
    Universal Switching Relay w/ Internal Transformer R8845U1003 Universal Switching Relay w/ Internal Transformer
    SKU: R8845U1003
    Brand: Honeywell
    (19)
    $58.99 each
    192
    Wed, Jan 27
    192
    QtyArrives
    192 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 2 Zone Pump Controller Switching Relay with Priority Protection Product Image
    Add to List
    Add to List
    2 Zone Pump Controller Switching Relay with Priority Protection SP-82 2 Zone Pump Controller Switching Relay with Priority Protection
    SKU: SP-82
    Brand: Azel Technologies
    (9)
    $103.95 each
    60
    Wed, Jan 27
    60
    QtyArrives
    60 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 6 Zone Expandable Switching Relay Product Image
    Add to List
    Add to List
    6 Zone Expandable Switching Relay ARM6P 6 Zone Expandable Switching Relay
    SKU: ARM6P
    Brand: Argo
    (34)
    $234.99 each
    92
    Wed, Jan 27
    92
    QtyArrives
    92 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 1 Zone Switching Relay Product Image
    Add to List
    Add to List
    1 Zone Switching Relay AR822II 1 Zone Switching Relay
    SKU: AR822II
    Brand: Argo
    (6)
    $59.82 each
    213
    Wed, Jan 27
    213
    QtyArrives
    213 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 4 Zone Expandable Switching Relay Product Image
    Add to List
    Add to List
    4 Zone Expandable Switching Relay ARM4P 4 Zone Expandable Switching Relay
    SKU: ARM4P
    Brand: Argo
    (34)
    $205.99 each
    63
    Wed, Jan 27
    63
    QtyArrives
    63 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • Isolation Relay<br>(Up to 3 Zones) Product Image
    Add to List
    Add to List
    Isolation Relay (Up to 3 Zones) IR882 Isolation Relay (Up to 3 Zones)
    SKU: IR882
    Brand: Argo
    (16)
    $69.24 each
    55
    Wed, Jan 27
    55
    QtyArrives
    55 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 3 Zone Pump Controller Switching Relay with Priority Protection Product Image
    Add to List
    Add to List
    3 Zone Pump Controller Switching Relay with Priority Protection SP-83 3 Zone Pump Controller Switching Relay with Priority Protection
    SKU: SP-83
    Brand: Azel Technologies
    (8)
    $125.95 each
    46
    Wed, Jan 27
    46
    QtyArrives
    46 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT) Product Image
    Add to List
    Add to 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
    Brand: Azel Technologies
    (5)
    $53.75 each
    31
    Wed, Jan 27
    31
    QtyArrives
    31 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 24v Replacement Relay Product Image
    Add to List
    Add to List
    24v Replacement Relay SR024-001RP 24v Replacement Relay
    SKU: SR024-001RP
    Brand: Taco
    (6)
    $24.99 each
    57
    Wed, Jan 27
    57
    QtyArrives
    57 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • 3 Zone Expandable Switching Relay Product Image
    Add to List
    Add to List
    3 Zone Expandable Switching Relay ARM3P 3 Zone Expandable Switching Relay
    SKU: ARM3P
    Brand: Argo
    (34)
    $167.99 each
    79
    Wed, Jan 27
    79
    QtyArrives
    79 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to List
  • UPZCP-1 Single Zone Pump Control  Product Image
    Add to List
    Add to List
    UPZCP-1 Single Zone Pump Control 98996400 UPZCP-1 Single Zone Pump Control
    SKU: 98996400
    Brand: Grundfos
    (2)
    $59.99 each
    48
    Wed, Jan 27
    48
    QtyArrives
    48 Wed, Jan 27
    Questions? Call 1-888-757-4774
    Add to 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.

NEED HELP?

888-757-4774
()
Monday – Thursday
8am–7:45pm ET
Friday
9am–7:45pm ET
  • 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.