McDonnell & Miller
Boiler Controls. McDonnell & Miller Low Water cut-offs are specially designed to protect steam and hot water boilers from the hazards of a low water condition. In operation they will interrupt the electrical current to the firing device, if the water in the system drops below the boiler manufacturer’s minimum safe water level. Our low water cut-offs also provide an additional circuit for a low water alarm, should you desire to install one, for additional protection.
If you have any questions please give us a call at 1-800-781-7405 or email us your request. Sales@NationalPumpSupply.com
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175802 McDonnell & Miller 157S-P Hi Pressure Level Control
McDonnell & Miller
$1,418.95175802 McDonnell & Miller 157S-P Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Features For boilers of any steaming capacity Model 175802 - 157S-P Monel bellows provides corrosion resistance Snap action...$1,418.95 -
172811 McDonnell & Miller Hi Pressure Level Control 157S-A-M
McDonnell & Miller
$1,628.95172811 McDonnell & Miller Hi Pressure Level Control 157S-A-M. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Model 173702 - 157S-A-M Monel bellows provides corrosion...$1,628.95 -
172807 McDonnell & Miller Hi Pressure Level Control 150S-M-MD
McDonnell & Miller
$1,038.95172807 McDonnell & Miller Hi Pressure Level Control 150S-M-MD. McDonnell & Miller 150S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action switches for high...$1,038.95 -
137100 McDonnell & Miller 53-2 Mechanical Water Feeder
McDonnell & Miller
$1,758.95137100 McDonnell & Miller 53-2 Mechanical Water Feeder. Features: For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2 ) with hot or cold water feed Optional features No. 2 switch Manual reset Float...$1,758.95 -
135200 McDonnell & Miller LWCO 51-2-M Mechanical Water Feeder
McDonnell & Miller
$1,558.95135200 McDonnell & Miller Mechanical Water Feeder LWCO 51-2-M. Mcdonnell & Miller 135200 Instruction Manual Features: For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water...$1,558.95 -
153603 LWCO McDonnell & Miller PSE-801-M-U-120 Probe Control
McDonnell & Miller
$394.95The Series 153603-LWCO - McDonnell & Miller PSE-801-M-U-120 Probe Control type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off...$394.95 -
135300 McDonnell & Miller 51-2-M-HD Head Mechanism
McDonnell & Miller
$1,414.95135300 McDonnell & Miller 51-2-M-HD Head Mechanism for Mechanical Water Feeder. *Please note image is generic. This Item Usually Ships The Same Day!$1,414.95 -
132700 McDonnell & Miller Water Feeder 47
McDonnell & Miller
$1,015.95132700 McDonnell & Miller Water Feeder 47. Features: For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed action Quick hook-up fittings...$1,015.95 -
114785 McDonnell & Miller FS5-J-1 Flow Switch 1 BSTB
McDonnell & Miller
$274.95114785 McDonnell & Miller FS5-J-1 Flow Switch 1 BSTB. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT, 1" NPT Materials of construction: Brass, carbon...$274.95 -
120174 McDonnell & Miller FS7-4SDJ Flow Switch 1-1 4 BST
McDonnell & Miller
$874.95120174 McDonnell & Miller FS7-4SDJ Flow Switch 1-1 4 BST. *Please note image is generic. Mcdonnell & Miller 120160 Instruction Manual Features: Universal design serves the widest variety of large pipe applications, including heating and...$874.95 -
120171 McDonnell & Miller FS7-4SJ Flow Switch 1-1 4 BSTP
McDonnell & Miller
$958.95120171 McDonnell & Miller FS7-4SJ Flow Switch 1-1 4 BSTP. *Please note image is generic. Mcdonnell & Miller 120160 Instruction Manual Features: Universal design serves the widest variety of large pipe applications, including heating and...$958.95 -
120158 McDonnell & Miller FS7-4ELJ Flow Switch 1-1 4 BST
McDonnell & Miller
$664.95120158 McDonnell & Miller FS7-4ELJ Flow Switch 1-1 4 BST. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: For hazardous environment applications requiring a NEMA 7 (Class I, Group C or D) or...$664.95 -
120135 McDonnell & Miller FS7-4EJ Flow Switch 1-1 4 BSTP
McDonnell & Miller
$644.95120135 McDonnell & Miller FS7-4EJ Flow Switch 1-1 4 BSTP. *Please note image is generic. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: For hazardous environment applications requiring a NEMA 7...$644.95 -
115654 McDonnell & Miller FS6-WJ-1 Flow Switch 1 BSTP
McDonnell & Miller
$484.95115654 McDonnell & Miller FS6-WJ-1 Flow Switch 1 BSTP. *Please note image is generic. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required,...$484.95 -
115653 McDonnell & Miller FS6-WJ-3 4 Flow Switch 3 4 BSTP
McDonnell & Miller
$584.95115653 McDonnell & Miller FS6-WJ-3 4 Flow Switch 3 4 BSTP *Please note image is generic. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required,...$584.95 -
122920 McDonnell Miller AF1-J Air Flow Switch
McDonnell & Miller
$214.95122920 McDonnell Miller AF1-J Air Flow Switch. *Please note image is generic. McDonnell & Miller AF1 Flow Switch Instruction Manual For general purpose applications with medium and high velocity requirements: Paddle fits 8" (203mm) minimum...$214.95 -
120602 McDonnell & Miller FS8-WJ Flow Switch 1 BSTP
McDonnell & Miller
$284.95120602 McDonnell & Miller FS8-WJ Flow Switch 1 BSTP. *Please note image is generic. Information: Mcdonnell & Miller 120601 Instruction Manual Features: For general purpose applications with environmental exposure, or those...$284.95 -
120361 McDonnell & Miller FS7-4WLJ Flow Switch 1-1 4BSTP
McDonnell & Miller
$574.95120361 McDonnell & Miller FS7-4WLJ Flow Switch 1-1 4BSTP. *Please note image is generic. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest variety of large pipe...$574.95 -
119980 McDonnell & Miller FS7-4LJ Flow Switch 1-1 4 BSTP
McDonnell & Miller
$484.95119980 McDonnell & Miller FS7-4LJ Flow Switch 1-1 4 BSTP. *Please note image is generic. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest variety of large pipe...$484.95 -
115650 McDonnell & Miller FS6-J-1 Flow Switch 1 BSTP
McDonnell & Miller
$424.95115650 McDonnell & Miller FS6-J-1 Flow Switch 1 BSTP. *Please note image is generic. McDonnell & Miller FS6 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Very high flow capacity Actuates at extremely...$424.95 -
115550 McDonnell & Miller FS6-J-3 4 Flow Switch 3 4 BSTP
McDonnell & Miller
$424.95115550 McDonnell & Miller FS6-J-3 4 Flow Switch 3 4 BSTP. *Please note image is generic. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required,...$424.95 -
178402 McDonnell & Miller 158S LWCO & Pump Controller
McDonnell & Miller
$1,258.95178402 McDonnell & Miller 158S LWCO & Pump Controller. McDonnell & Miller 158S Instruction Manual Features and Benefits For commercial and industrial low or high pressure Boiler applications For boilers of any steaming...$1,258.95 -
153605 McDonnell & Miller RBT-3000 LWCO & Fuel Economizer
McDonnell & Miller
$264.95153605 McDonnell & Miller RBT-3000 LWCO & Fuel Economizer. Technical Brochure The RBT-3000 is a combination Low-Water Safety Cut-Off and Fuel-Saving controller for residential heating systems. The Low Water Cut-Off is specifically designed...$264.95 -
144693 McDonnell & Miller RB-24E-S Low Water Cut Off
McDonnell & Miller
$184.95144693 McDonnell & Miller RB-24E-S Low Water Cut Off. This Item Usually Ships The Same Day!$184.95 -
178001 McDonnell & Miller 157R158S-HD Hi Pressure Level Control
McDonnell & Miller
$1,784.95178001 McDonnell & Miller 157R158S-HD Hi Pressure Level Control. Information: McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action...$1,784.95 -
176222 McDonnell & Miller 157S-R-MD Hi Pressure Level Control
McDonnell & Miller
$1,537.95176222 McDonnell & Miller 157S-R-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action switches for...$1,537.95 -
172817 McDonnell & Miller 157S-M Hi Pressure Level Control
McDonnell & Miller
$1,558.95172817 McDonnell & Miller 157S-M Hi Pressure Level Control. Information: McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action...$1,558.95 -
176601 McDonnell & Miller 157S-RB-MD Hi Pressure Level Control
McDonnell & Miller
$1,711.95176601 McDonnell & Miller 157S-RB-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action switches for...$1,711.95 -
172814 McDonnell & Miller 157S-RB-M Hi Pressure Level Control
McDonnell & Miller
$1,392.95172814 McDonnell & Miller 157S-RB-M Hi Pressure Level Control. Information: McDonnell & Miller 150S/157S Instruction Manual Features For boilers of any steaming capacity Model 175802 - 157S-P Monel bellows provides corrosion...$1,392.95 -
176220 McDonnell & Miller 157S-R Hi Pressure Level Control
McDonnell & Miller
$1,657.95176220 McDonnell & Miller 157S-R Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Features For boilers of any steaming capacity Model 175802 - 157S-P Monel bellows provides corrosion resistance Snap action...$1,657.95 -
143702 McDonnell & Miller Mechanical LWCO 64A-M
McDonnell & Miller
$981.95143702 McDonnell & Miller Mechanical Low Water Cut Off 64A-M. Mechanical For Steam Boilers. Mcdonnell & Miller LWCO Series 64 Instruction Manual Features: Optional manual reset is available For boilers of any steaming...$981.95 -
135800 McDonnell & Miller 51-S-HD Head Mechanism
McDonnell & Miller
$1,424.95135800 - McDonnell & Miller 51-S-HD Head Mechanism for Mechanical Water Feeder. This Item Usually Ships The Same Day!$1,424.95 -
171907 McDonnell & Miller Low Pressure Cut-Off 1575
McDonnell & Miller
$1,609.95171907 McDonnell & Miller Low Pressure Cut-Off 1575 Low water cut-off and pump control for steam and hot water boilers. 250 psi with 1" pipe tappings. Probe chamber with three probes and control unit. This Item Usually Ships The Same Day!$1,609.95 -
119760 McDonnell & Miller FS7-4DS - 1-1/4" Flow Switch
McDonnell & Miller
$1,121.95McDonnell & Miller FS7-4DS - 1-1/4" Flow Switch With Stainless Steel Body - w/2 SPDT Switches 119760. Information: McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the...$1,121.95 -
114793 McDonnell & Miller FS5-DS-1 - 1" Flow Switch
McDonnell & Miller
$1,154.95114793 McDonnell & Miller FS5-DS-1 - 1" Flow Switch With Stainless Steel Body, 2 SPDT Switches 114793. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT,...$1,154.95 -
181425 McDonnell & Miller Relief Valve 250-3/4-45
McDonnell & Miller
$184.95181425 McDonnell & Miller Relief Valve 250-3/4-45. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3 psi (.21 kg/cm2) between...$184.95 -
181325 McDonnell & Miller Relief Valve 250-3/4-36
McDonnell & Miller
$184.95181325 McDonnell & Miller Relief Valve 250-3/4-36. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3 psi (.21 kg/cm2) between...$184.95