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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 Mcdonnell & Miller
    SKU: 144692
    Brand: Mcdonnell & Miller
    (8)
    $84.99 each
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    189
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    189 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 144676
    Brand: Mcdonnell & Miller
    (6)
    $84.99 each
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    338
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    338 Thu, Aug 5
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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 Taco
    SKU: LTA1203S-2
    Brand: Taco
    (12)
    $83.83 each
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    116
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    116 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 173003
    Brand: Mcdonnell & Miller
    (11)
    $603.57 each
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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 Mcdonnell & Miller
    SKU: 149400
    Brand: Mcdonnell & Miller
    (26)
    $303.33 each
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    121
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    121 Thu, Aug 5
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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 Hydrolevel
    SKU: 48-3250
    Brand: Hydrolevel
    (13)
    $156.61 each
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    273
    Thu, Aug 5
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    273 Thu, Aug 5
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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 Hydrolevel
    SKU: 48-3200
    Brand: Hydrolevel
    (10)
    $154.94 each
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    149
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    149 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 153927-LWCO
    Brand: Mcdonnell & Miller
    (6)
    $201.60 each
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    114
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    114
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    114 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 176234
    Brand: Mcdonnell & Miller
    (4)
    $160.99 each
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    182
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    182
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    182 Thu, Aug 5
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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 Hydrolevel
    SKU: 45-550
    Brand: Hydrolevel
    (10)
    $196.42 each
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    327
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    327
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    327 Thu, Aug 5
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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 Hydrolevel
    SKU: 45-1100
    Brand: Hydrolevel
    (13)
    $79.91 each
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    142
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    142
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    142 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 325600
    Brand: Mcdonnell & Miller
    $6.38 each
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    432
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    432 Thu, Aug 5
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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 Hydrolevel
    SKU: 45-1150
    Brand: Hydrolevel
    (13)
    $88.09 each
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    231
    Thu, Aug 5
    231
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    231 Thu, Aug 5
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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 Taco
    SKU: LTR0243T-1
    Brand: Taco
    (3)
    $92.43 each
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    184
    Thu, Aug 5
    275
    QtyArrives
    184 Thu, Aug 5
    91 Mon, Aug 9 – Tue, Aug 10
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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 Hydrolevel
    SKU: 45-214
    Brand: Hydrolevel
    (6)
    $47.92 each
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    220
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    220 Thu, Aug 5
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  • Safgard 400 Non-Cycling Steam Primary LWCO  - 24V Product Image
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    Safgard 400 Non-Cycling Steam Primary LWCO - 24V 45-400-HYDROLEVEL Safgard 400 Non-Cycling Steam Primary LWCO - 24V
    SKU: 45-400-HYDROLEVEL Hydrolevel
    SKU: 45-400-HYDROLEVEL
    Brand: Hydrolevel
    (13)
    $176.79 each
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    214
    Thu, Aug 5
    214
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    214 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 176207
    Brand: Mcdonnell & Miller
    (2)
    $146.15 each
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    51
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    51
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    51 Thu, Aug 5
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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 Hydrolevel
    SKU: 48-140
    Brand: Hydrolevel
    (5)
    $38.80 each
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    37
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    37
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    37 Thu, Aug 5
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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 Hydrolevel
    SKU: 48-3150
    Brand: Hydrolevel
    (5)
    $138.47 each
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    63
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    63
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    63 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 354081
    Brand: Mcdonnell & Miller
    (1)
    $56.90 each
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    68 Thu, Aug 5
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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 Mcdonnell & Miller
    SKU: 310453
    Brand: Mcdonnell & Miller
    (11)
    $127.18 each
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  • 24V Electronic LWCO (Water) 1" Probe Product Image
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    24V Electronic LWCO (Water) 1" Probe LTR0243L-1 24V Electronic LWCO (Water) 1" Probe
    SKU: LTR0243L-1 Taco
    SKU: LTR0243L-1
    Brand: Taco
    $95.69 each
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    94
    Thu, Aug 5
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    94 Thu, Aug 5
    27 Mon, Aug 9 – Tue, Aug 10
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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 Mcdonnell & Miller
    SKU: 318900
    Brand: Mcdonnell & Miller
    (1)
    $5.05 each
      Box Up & Save 5%  
    $47.80 box of 10
    $4.78 each
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    166
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    166
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    166 Thu, Aug 5
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  • 67-G, 67 Float Type LWCO for mV Service (Steam) Product Image
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    67-G, 67 Float Type LWCO for mV Service (Steam) 149600 67-G, 67 Float Type LWCO for mV Service (Steam)
    SKU: 149600 Mcdonnell & Miller
    SKU: 149600
    Brand: Mcdonnell & Miller
    (9)
    $275.99 each
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    38
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    38
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    38 Thu, Aug 5
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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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