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  • RB-24E, GuardDog Electronic <br>24V LWCO (Water) Product Image
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    RB-24E, GuardDog Electronic 24V LWCO (Water) 144692 RB-24E, GuardDog Electronic 24V LWCO (Water)
    SKU: 144692
    Brand: Mcdonnell & Miller
    (7)
    $85.99 each
    361
    Mon, Aug 24
    361
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    361 Mon, Aug 24
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  • RB-122E, GuardDog Electronic<br> 120V LWCO (Water) Product Image
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    RB-122E, GuardDog Electronic 120V LWCO (Water) 144676 RB-122E, GuardDog Electronic 120V LWCO (Water)
    SKU: 144676
    Brand: Mcdonnell & Miller
    (5)
    $85.99 each
    317
    Mon, Aug 24
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    317 Mon, Aug 24
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  • 150S-HD, Head Assembly for 150 series<br>(Snap Switch) Product Image
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    150S-HD, Head Assembly for 150 series (Snap Switch) 173003 150S-HD, Head Assembly for 150 series (Snap Switch)
    SKU: 173003
    Brand: Mcdonnell & Miller
    (10)
    $483.99 each
    158
    Mon, Aug 24
    158
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    158 Mon, Aug 24
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  • 67, Float Type<br>Low Water Cutoff (Steam) Product Image
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    67, Float Type Low Water Cutoff (Steam) 149400 67, Float Type Low Water Cutoff (Steam)
    SKU: 149400
    Brand: Mcdonnell & Miller
    (23)
    $268.99 each
    215
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    215
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    215 Mon, Aug 24
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  • 120V Electronic Auto Reset LWCO, (Water)<br>Electrical Knock-outs: 4 Product Image
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    120V Electronic Auto Reset LWCO, (Water) Electrical Knock-outs: 4 LTA1203S-2 120V Electronic Auto Reset LWCO, (Water) Electrical Knock-outs: 4
    SKU: LTA1203S-2
    Brand: Taco
    (11)
    $77.19 each
    124
    Mon, Aug 24
    273
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    124 Mon, Aug 24
    149 Tue, Aug 25 – Wed, Aug 26
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  • Model 3250-Plus Fuel Smart Hydrostat for Oil Boilers (Temperature Limit, LWCO, & Boiler Reset Control) Product Image
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    Model 3250-Plus Fuel Smart Hydrostat for Oil Boilers (Temperature Limit, LWCO, & Boiler Reset Control) 48-3250 Model 3250-Plus Fuel Smart Hydrostat for Oil Boilers (Temperature Limit, LWCO, & Boiler Reset Control)
    SKU: 48-3250
    Brand: Hydrolevel
    (11)
    $143.99 each
    258
    Mon, Aug 24
    308
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    258 Mon, Aug 24
    50 Tue, Aug 25 – Wed, Aug 26
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  • 751P-MT-120, GuardDog Electronic manual reset LWCO<br>w/ Probe (Water) Product Image
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    751P-MT-120, GuardDog Electronic manual reset LWCO w/ Probe (Water) 176234 751P-MT-120, GuardDog Electronic manual reset LWCO w/ Probe (Water)
    SKU: 176234
    Brand: Mcdonnell & Miller
    (4)
    $161.99 each
    211
    Mon, Aug 24
    211
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    211 Mon, Aug 24
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  • 150-14H, Gasket for 150 Product Image
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    150-14H, Gasket for 150 325600 150-14H, Gasket for 150
    SKU: 325600
    Brand: Mcdonnell & Miller
    $6.89 each
    130
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    130 Mon, Aug 24
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  • Safgard 5500 LWCO w/ Manual Reset & Test Button/Light - 120V Product Image
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    Safgard 5500 LWCO w/ Manual Reset & Test Button/Light - 120V 45-550 Safgard 5500 LWCO w/ Manual Reset & Test Button/Light - 120V
    SKU: 45-550
    Brand: Hydrolevel
    (10)
    $179.99 each
    232
    Mon, Aug 24
    282
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    232 Mon, Aug 24
    50 Tue, Aug 25 – Wed, Aug 26
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  • Safgard 1100 LWCO w/ Auto Reset & Burner Circuit Test Button - 24V Product Image
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    Safgard 1100 LWCO w/ Auto Reset & Burner Circuit Test Button - 24V 45-1100 Safgard 1100 LWCO w/ Auto Reset & Burner Circuit Test Button - 24V
    SKU: 45-1100
    Brand: Hydrolevel
    (12)
    $88.99 each
    276
    Mon, Aug 24
    325
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    276 Mon, Aug 24
    49 Tue, Aug 25 – Wed, Aug 26
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  • 24V Electronic LWCO (Water) 1" Probe Product Image
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    24V Electronic LWCO (Water) 1" Probe LTR0243T-1 24V Electronic LWCO (Water) 1" Probe
    SKU: LTR0243T-1
    Brand: Taco
    (2)
    $84.99 each
    100
    Mon, Aug 24
    121
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    100 Mon, Aug 24
    21 Tue, Aug 25 – Wed, Aug 26
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  • PSE802-24, Electronic 24V Low Water Cutoff with Auto Reset (Steam) Product Image
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    PSE802-24, Electronic 24V Low Water Cutoff with Auto Reset (Steam) 153927-LWCO PSE802-24, Electronic 24V Low Water Cutoff with Auto Reset (Steam)
    SKU: 153927-LWCO
    Brand: Mcdonnell & Miller
    (4)
    $158.99 each
    199
    Mon, Aug 24
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    199 Mon, Aug 24
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  • EL1214, 3/4" NPT Standard Ceramic Probe (2-7/8" ID) Product Image
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    EL1214, 3/4" NPT Standard Ceramic Probe (2-7/8" ID) 45-214 EL1214, 3/4" NPT Standard Ceramic Probe (2-7/8" ID)
    SKU: 45-214
    Brand: Hydrolevel
    (6)
    $44.29 each
    234
    Mon, Aug 24
    234
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    234 Mon, Aug 24
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  • Model 3200-Plus Fuel Smart Hydrostat for Gas Boilers (Temperature Limit, LWCO, & Boiler Reset Control) Product Image
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    Model 3200-Plus Fuel Smart Hydrostat for Gas Boilers (Temperature Limit, LWCO, & Boiler Reset Control) 48-3200 Model 3200-Plus Fuel Smart Hydrostat for Gas Boilers (Temperature Limit, LWCO, & Boiler Reset Control)
    SKU: 48-3200
    Brand: Hydrolevel
    (8)
    $159.99 each
    236
    Mon, Aug 24
    273
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    236 Mon, Aug 24
    37 Tue, Aug 25 – Wed, Aug 26
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  • Safgard 1150 LWCO w/ Auto Reset & Burner Circuit Test Button -120V  Product Image
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    Safgard 1150 LWCO w/ Auto Reset & Burner Circuit Test Button -120V 45-1150 Safgard 1150 LWCO w/ Auto Reset & Burner Circuit Test Button -120V
    SKU: 45-1150
    Brand: Hydrolevel
    (12)
    $88.99 each
    226
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    269
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    226 Mon, Aug 24
    43 Tue, Aug 25 – Wed, Aug 26
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  • 750-MT-120, GuardDog Electronic <br>Manual Reset LWCO <br>(Water) Product Image
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    750-MT-120, GuardDog Electronic Manual Reset LWCO (Water) 176207 750-MT-120, GuardDog Electronic Manual Reset LWCO (Water)
    SKU: 176207
    Brand: Mcdonnell & Miller
    (1)
    $135.99 each
    92
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    92
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    92 Mon, Aug 24
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  • OS-100 Outdoor Sensor Kit for HydroStat 3200-PLUS and 3250-PLUS Product Image
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    OS-100 Outdoor Sensor Kit for HydroStat 3200-PLUS and 3250-PLUS 48-140 OS-100 Outdoor Sensor Kit for HydroStat 3200-PLUS and 3250-PLUS
    SKU: 48-140
    Brand: Hydrolevel
    (4)
    $35.69 each
    57
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    57
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    57 Mon, Aug 24
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  • 150S-M-HD, Head for Float Combo LWCO Pump Ctrl <br>w/ Man. Reset (Steam) Product Image
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    150S-M-HD, Head for Float Combo LWCO Pump Ctrl w/ Man. Reset (Steam) 172809 150S-M-HD, Head for Float Combo LWCO Pump Ctrl w/ Man. Reset (Steam)
    SKU: 172809
    Brand: Mcdonnell & Miller
    (1)
    $519.99 each
    65
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    65 Mon, Aug 24
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  • PA-800, Probe Assembly for 750, 750-MT-120 & PS800 Series Product Image
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    PA-800, Probe Assembly for 750, 750-MT-120 & PS800 Series 354081 PA-800, Probe Assembly for 750, 750-MT-120 & PS800 Series
    SKU: 354081
    Brand: Mcdonnell & Miller
    (1)
    $56.99 each
    72
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  • CTRD-101, Cartridge & Strainer Kit, Model<br>CTRD-101 Product Image
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    CTRD-101, Cartridge & Strainer Kit, Model CTRD-101 310453 CTRD-101, Cartridge & Strainer Kit, Model CTRD-101
    SKU: 310453
    Brand: Mcdonnell & Miller
    (10)
    $123.99 each
    48
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    48 Mon, Aug 24
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  • Safgard 170SV LWCO w/ Auto Reset, Shorter Probe - 120V Product Image
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    Safgard 170SV LWCO w/ Auto Reset, Shorter Probe - 120V 45-175 Safgard 170SV LWCO w/ Auto Reset, Shorter Probe - 120V
    SKU: 45-175
    Brand: Hydrolevel
    (4)
    $96.99 each
    131
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    158
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    131 Mon, Aug 24
    27 Tue, Aug 25 – Wed, Aug 26
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  • 67-12, Sylphon Gasket <br>for 67 & 80 Product Image
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    67-12, Sylphon Gasket for 67 & 80 318900 67-12, Sylphon Gasket for 67 & 80
    SKU: 318900
    Brand: Mcdonnell & Miller
    (1)
    $5.19 each
    53
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    53
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    53 Mon, Aug 24
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  • Model 3150 HydroStat for Oil Boilers (Temperature Limit & LWCO) Product Image
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    Model 3150 HydroStat for Oil Boilers (Temperature Limit & LWCO) 48-3150 Model 3150 HydroStat for Oil Boilers (Temperature Limit & LWCO)
    SKU: 48-3150
    Brand: Hydrolevel
    (4)
    $147.99 each
    112
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    134
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    112 Mon, Aug 24
    22 Tue, Aug 25 – Wed, Aug 26
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  • 24V Electronic Auto Reset LWCO (Water)<br>Electrical Knock-outs: 4 Product Image
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    24V Electronic Auto Reset LWCO (Water) Electrical Knock-outs: 4 LTA0243S-2 24V Electronic Auto Reset LWCO (Water) Electrical Knock-outs: 4
    SKU: LTA0243S-2
    Brand: Taco
    (11)
    $86.99 each
    41
    Mon, Aug 24
    219
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    41 Mon, Aug 24
    178 Tue, Aug 25 – Wed, Aug 26
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FAQs, Manuals & Videos

Resources

Articles

  • A low water cutoff is a device that detects when the fluid level in hot water and steam boilers drops below the minimum safe operating level specified by the boiler manufacturer. If this should occur, the low water cutoff will cut-off the burner and shut down the boiler. If a boiler is "dry-fired" (burned without water in it), it can result in boiler failure, or a possible fire/explosion. The low water cutoff can therefore be one of the most important safety devices in your hydronic heating system. Low water cutoffs are available in line voltage or low voltage models, for either water or steam systems.

    We carry a wide selection of Taco, McDonnell and Miller, and Hydrolevel low water cutoffs for residential, commercial, and industrial boiler applications.

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