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  • 1 Zone Switching Relay Product Image
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    1 Zone Switching Relay SR501-4 1 Zone Switching Relay
    SKU: SR501-4 Taco
    SKU: SR501-4
    Brand: Taco
    (129)
    $62.50 each
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    892
    Wed, Aug 4
    1,952
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    892 Wed, Aug 4
    1,060 Fri, Aug 6 – Mon, Aug 9
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  • 3 Zone Switching Relay Product Image
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    3 Zone Switching Relay SR503-4 3 Zone Switching Relay
    SKU: SR503-4 Taco
    SKU: SR503-4
    Brand: Taco
    (40)
    $159.48 each
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    217
    Wed, Aug 4
    217
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    217 Wed, Aug 4
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  • 2 Zone Switching Relay Product Image
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    2 Zone Switching Relay SR502-4 2 Zone Switching Relay
    SKU: SR502-4 Taco
    SKU: SR502-4
    Brand: Taco
    (25)
    $149.10 each
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    296
    Wed, Aug 4
    296
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    296 Wed, Aug 4
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  • 4 Zone Switching Relay Product Image
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    4 Zone Switching Relay SR504-4 4 Zone Switching Relay
    SKU: SR504-4 Taco
    SKU: SR504-4
    Brand: Taco
    (129)
    $197.00 each
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    94
    Wed, Aug 4
    94
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    94 Wed, Aug 4
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  • 2 Zone 120V Switching Relay w/ DPST Switching Product Image
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    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)
    $81.69 each
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    141
    Wed, Aug 4
    407
    QtyArrives
    141 Wed, Aug 4
    266 Thu, Aug 5
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  • 6 Zone Switching Relay Product Image
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    6 Zone Switching Relay SR506-4 6 Zone Switching Relay
    SKU: SR506-4 Taco
    SKU: SR506-4
    Brand: Taco
    (129)
    $252.00 each
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    65
    Wed, Aug 4
    65
    QtyArrives
    65 Wed, Aug 4
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  • 4 Zone Switching Relay<br>w/ Priority Product Image
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    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
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    12
    Wed, Aug 4
    12
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    12 Wed, Aug 4
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  • 3 Zone Switching Relay<br>w/ Priority Product Image
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    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
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    26
    Wed, Aug 4
    26
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    26 Wed, Aug 4
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  • 1 Zone 120V Switching Relay w/ Internal Transformer, 1 SPST Product Image
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    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
    (20)
    $62.47 each
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    163
    Wed, Aug 4
    252
    QtyArrives
    163 Wed, Aug 4
    89 Thu, Aug 5
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  • 6 Zone Switching Relay<br>w/ Priority Product Image
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    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
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    182
    Wed, Aug 4
    288
    QtyArrives
    182 Wed, Aug 4
    106 Fri, Aug 6 – Mon, Aug 9
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  • Switching Relay w/ Internal Transformer DPST Line Voltage Relays Product Image
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    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)
    $79.94 each
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    63
    Wed, Aug 4
    142
    QtyArrives
    63 Wed, Aug 4
    79 Thu, Aug 5
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  • Replacement Fuse - <br>5 Amp (10 Pack) Product Image
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    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
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    245
    Wed, Aug 4
    337
    QtyArrives
    245 Wed, Aug 4
    92 Fri, Aug 6 – Mon, Aug 9
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  • Replacement Fuse - <br>6 Amp (10 Pack) Product Image
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    Replacement Fuse - 6 Amp (10 Pack) SR6A-001RP Replacement Fuse - 6 Amp (10 Pack)
    SKU: SR6A-001RP Taco
    SKU: SR6A-001RP
    Brand: Taco
    (5)
    $19.27 each
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    244
    Wed, Aug 4
    303
    QtyArrives
    244 Wed, Aug 4
    59 Fri, Aug 6 – Mon, Aug 9
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  • Universal Switching Relay w/ Internal Transformer Product Image
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    Universal Switching Relay w/ Internal Transformer R8845U1003 Universal Switching Relay w/ Internal Transformer
    SKU: R8845U1003 Resideo
    SKU: R8845U1003
    Brand: Resideo
    (19)
    $60.45 each
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    79
    Wed, Aug 4
    214
    QtyArrives
    79 Wed, Aug 4
    135 Thu, Aug 5
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  • 2 Zone Pump Controller Switching Relay with Priority Protection Product Image
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    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
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    36
    Wed, Aug 4
    36
    QtyArrives
    36 Wed, Aug 4
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  • 6 Zone Expandable Switching Relay Product Image
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    6 Zone Expandable Switching Relay ARM6P 6 Zone Expandable Switching Relay
    SKU: ARM6P Argo
    SKU: ARM6P
    Brand: Argo
    (35)
    $266.21 each
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    31
    Wed, Aug 4
    125
    QtyArrives
    31 Wed, Aug 4
    94 Thu, Aug 5
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  • 3 Zone Pump Controller Switching Relay with Priority Protection Product Image
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    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
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    36
    Wed, Aug 4
    36
    QtyArrives
    36 Wed, Aug 4
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  • 1 Zone Switching Relay Product Image
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    1 Zone Switching Relay AR822II 1 Zone Switching Relay
    SKU: AR822II Argo
    SKU: AR822II
    Brand: Argo
    (6)
    $59.82 each
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    27
    Wed, Aug 4
    177
    QtyArrives
    27 Wed, Aug 4
    150 Thu, Aug 5
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  • 4 Zone Expandable Switching Relay Product Image
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    4 Zone Expandable Switching Relay ARM4P 4 Zone Expandable Switching Relay
    SKU: ARM4P Argo
    SKU: ARM4P
    Brand: Argo
    (35)
    $242.67 each
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    47
    Wed, Aug 4
    177
    QtyArrives
    47 Wed, Aug 4
    130 Thu, Aug 5
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  • 1 Zone Pump Controller Switching Relay w/ Surge & Fuse Protection (DPDT) Product Image
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    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
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    49
    Wed, Aug 4
    49
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    49 Wed, Aug 4
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  • 24v Replacement Relay Product Image
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    24v Replacement Relay SR024-001RP 24v Replacement Relay
    SKU: SR024-001RP Taco
    SKU: SR024-001RP
    Brand: Taco
    (7)
    $24.41 each
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    168
    Wed, Aug 4
    188
    QtyArrives
    168 Wed, Aug 4
    4 Thu, Aug 5
    16 Fri, Aug 6 – Mon, Aug 9
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  • 3 Zone Expandable Switching Relay Product Image
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    3 Zone Expandable Switching Relay ARM3P 3 Zone Expandable Switching Relay
    SKU: ARM3P Argo
    SKU: ARM3P
    Brand: Argo
    (35)
    $190.21 each
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    82
    Wed, Aug 4
    232
    QtyArrives
    82 Wed, Aug 4
    150 Thu, Aug 5
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  • Isolation Relay<br>(Up to 3 Zones) Product Image
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    Isolation Relay (Up to 3 Zones) IR882 Isolation Relay (Up to 3 Zones)
    SKU: IR882 Argo
    SKU: IR882
    Brand: Argo
    (16)
    $90.07 each
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    33
    Wed, Aug 4
    36
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    33 Wed, Aug 4
    3 Thu, Aug 5
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  • UPZCP-1 Single Zone Pump Control  Product Image
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    UPZCP-1 Single Zone Pump Control 98996400 UPZCP-1 Single Zone Pump Control
    SKU: 98996400 Grundfos
    SKU: 98996400
    Brand: Grundfos
    (3)
    $61.99 each
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    81
    Wed, Aug 4
    81
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    81 Wed, Aug 4
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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.

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