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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110800 McDonnell & Miller Proportion Switch Only Fits Model 93 & 94 LWCO
McDonnell & Miller
$1,638.95110800 McDonnell & Miller Proportion Switch Only. Fits Model 93, 193 & 94, 194 LWCO's. Information: Mcdonnell & Miller General Catalog Mcdonnell & Miller Service Parts Catalog Mcdonnell & Miller Series 93-94 & 193-194...$1,638.95 -
176234 McDonnell & Miller 751P-MT-120 LWCO - 120V w/standard probe
McDonnell & Miller
$312.95176234 McDonnell & Miller 751P-MT-120 LWCO - 120V w/standard probe. Mcdonnell & Miller Series 751P/752P LWCO Brochure Mcdonnell & Miller Series 751P/752P LWCO Instruction Manual The Series 751P/752P probe type LWCOs...$312.95 -
144694 McDonnell & Miller RB-24E-A Low Water Cut Off
McDonnell & Miller
$224.95144694 McDonnell & Miller RB-24E-A Low Water Cut Off. This Item Usually Ships The Same Day!$224.95 -
165200 McDonnell & Miller High Pressure Level Control 94
McDonnell & Miller
$1,947.95165200 McDonnell & Miller High Pressure Level Control 94. Mcdonnell & Miller Submittal Sheet Features For commercial and industrial low or high pressure steam boilers Maintains consistent water level regardless of pressure For boilers...$1,947.95 -
120301 McDonnell & Miller FS7-4WL - 1-1/4" Flow Switch
McDonnell & Miller
$684.95120301 McDonnell & Miller FS7-4WL - 1-1/4" Flow Switch w/NEMA 4X Enclosure & Extended Paddle & Paddle Arm. Information: 120301 Mcdonnell & Miller Instruction Manual Features: For applications requiring a water-tight, dust-tight...$684.95 -
119750 McDonnell & Miller FS7-4D - 1-1/4" Flow Switch
McDonnell & Miller
$638.95119750 McDonnell & Miller FS7-4D - 1-1/4" Flow Switch With /2 SPDT. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest variety of large pipe applications, including...$638.95 -
153927 McDonnell & Miller PSE-802-RX2-24 LWCO
McDonnell & Miller
$408.95The series 153927 McDonnell & Miller PSE-802-RX2-24 Low Water Cut Off. This Item Usually Ships The Same Day!$408.95 -
129702 McDonnell & Miller LWCO 42S-A Pump Controller
McDonnell & Miller
$1,298.95129702 McDonnell & Miller LWCO 42S-A Pump Controller. 129702 McDonnell & Miller LWCO 42S-A Pump Controller Instruction Manual For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column For...$1,298.95 -
137200 McDonnell & Miller Mechanical Water Feeder 53-2M
McDonnell & Miller
$1,752.95137200 McDonnell & Miller Mechanical Water Feeder 53-2M. 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 block Proportional...$1,752.95 -
136900 McDonnell & Miller Mechanical 53 Water Feeder
McDonnell & Miller
$1,579.95136900 McDonnell & Miller Mechanical 53 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...$1,579.95 -
176296 McDonnell & Miller 752-MT-24 Low Water Cut Off
McDonnell & Miller
$312.95176296 McDonnell & Miller 752-MT-24 Low Water Cut Off. Information: Product Brochure This Item Usually Ships The Same Day!$312.95 -
313600 McDonnell & Miller 37A-130 Replacement Float for 847 and 851
McDonnell & Miller
$412.95313600 McDonnell & Miller 37A-130 Replacement Float for 847 and 851. This Item Usually Ships The Same Day!$412.95 -
165900 McDonnell & Miller 94M LWCO & Pump Controller
McDonnell & Miller
$1,947.95165900 McDonnell & Miller Level Control 94M. Information: Mcdonnell & Miller Submittal Sheet Features For commercial and industrial low or high pressure steam boilers Maintains consistent water level regardless of pressure For...$1,947.95 -
162500 McDonnell & Miller High Pressure Level Control 93-M
McDonnell & Miller
$1,751.95162500 McDonnell & Miller High Pressure Level Control 93-M. Information: McDonnell & Miller Submittal Sheet Features For commercial and industrial low or high pressure steam boilers Maintains consistent water level regardless of...$1,751.95 -
120175 McDonnell & Miller FS7-4SE - 1-1/4" Flow Switch
McDonnell & Miller
$1,198.95120175 McDonnell & Miller FS7-4SE - 1-1/4" Flow Switch With Stainless Steel Body And NEMA 7 & 9 Enclosure. Mcdonnell & Miller 120175 Instruction Manual Features: For hazardous environment applications requiring a NEMA 7 (Class I,...$1,198.95 -
119900 McDonnell & Miller FS7-4L - 1-1/4" Flow Switch
McDonnell & Miller
$568.95119900 McDonnell & Miller FS7-4L - 1-1/4" Flow Switch With Extended Paddle & Paddle Arm 119900. Information: McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest...$568.95 -
114795 McDonnell & Miller FS5-S-1 - 1" Flow Switch
McDonnell & Miller
$1,096.95114795 McDonnell & Miller FS5-S-1 - 1" Flow Switch With Stainless Steel Body 114795. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT, 1" NPT Materials...$1,096.95 -
115200 McDonnell & Miller FS4-3T2-1 - 1" Flow Switch
McDonnell & Miller
$314.95115200 McDonnell & Miller FS4-3T2-1 - 1" Flow Switch With NPT Body Medium Flow Rate 115200. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms,...$314.95 -
114642 McDonnell & Miller FS4-3DS 1" Flow Switch
McDonnell & Miller
$738.95114642 McDonnell & Miller FS4-3DS 1" Flow Switch With Stainless Steel Body & 2 SPDT switches 114642. McDonnell & Miller FS4 Brochure McDonnell & Miller FS4 Instruction Manual Universal design serves the widest variety of...$738.95 -
172815 McDonnell & Miller LWCO 157S-RLM
McDonnell & Miller
$1,622.95172815 McDonnell & Miller LWCO 157S-RLM. Please Contact Us For Lead Time.$1,622.95 -
173603 McDonnell & Miller 157S-MD Hi Pressure Level Control
McDonnell & Miller
$1,408.95173603 McDonnell & Miller 157S-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Model 173603 - 157S-MD Monel bellows provides corrosion resistance Snap...$1,408.95 -
175402 McDonnell & Miller 157S-M Hi Pressure Level Control
McDonnell & Miller
175402 McDonnell & Miller 157S-M Hi Pressure Level Control. *Please note this item is discontinued and replaced by the 172812 McDonnell & Miller 157S-M Hi Pressure Level Control. Information: McDonnell & Miller 150S/157S Instruction...Qty in Cart: 0Quantity:Price:Subtotal: -
149700 McDonnell & Miller Mechanical LWCO 67-M
McDonnell & Miller
**Discontinued 149700 McDonnell & Miller Mechanical Low Water Cut Off 67-M. Float Type Low Water Cut Off For Millivolt Service. P/N's 149400 and 354001 are the equivalent to P/N 149700. Information: McDonnell & Miller LWCO...Qty in Cart: 0Quantity:Price:Subtotal: -
135600 McDonnell & Miller Mechanical Water Feeder 51-S
McDonnell & Miller
$1,621.95135600 McDonnell & Miller Mechanical Water Feeder 51-S. Mcdonnell & Miller 135600 Instruction Manual Features: For high capacity [up to 35,000 sq. ft. (3250m2)] low pressure steam and hot water boilers with cold water feed Optional...$1,621.95 -
134700 McDonnell & Miller Mechanical Water Feeder 51
McDonnell & Miller
$1,354.95134700 McDonnell & Miller Mechanical Water Feeder 51. For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed Quick-change replaceable cartridge valve and strainer Optional...$1,354.95 -
153827 LWCO McDonnell & Miller PSE-801-120 Probe Control
McDonnell & Miller
$324.95The Series 153827-LWCO McDonnell & Miller PSE-801-120 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 based...$324.95 -
153828-LWCO - McDonnell & Miller PSE-801-U-120 Probe Control
McDonnell & Miller
$358.95The Series 153876 - McDonnell & Miller PS-801-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 based on...$358.95 -
135100 McDonnell & Miller 51-2-HD Head Mechanism
McDonnell & Miller
$1,407.95135100 McDonnell & Miller 51-2-HD Head Mechanism for Mechanical Water Feeder. This Item Usually Ships The Same Day!$1,407.95 -
115100 McDonnell & Miller FS4-3T1-1 - 1" Flow Switch
McDonnell & Miller
$328.95115100 McDonnell & Miller FS4-3T1-1 - 1" Flow Switch With NPT Body High Flow Switch. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms, motors,...$328.95 -
164400 McDonnell & Miller 193-7B LWCO & Pump CTRL. w/ Potentiometer
McDonnell & Miller
$2,651.95164400 McDonnell & Miller 193-7B LWCO & Pump CTRL. w/ Potentiometer. Information: McDonnell & Miller LWCO Instruction Manual Features: For commercial and industrial low or high pressure steam boilers Maintains consistent water...$2,651.95 -
120605 McDonnell & Miller FS8-WZ Flow Switch 1 NPT
McDonnell & Miller
$314.95120605 McDonnell & Miller FS8-WZ Flow Switch 1 NPT. *Please note image is generic. Information: Mcdonnell & Miller 120601 Instruction Manual Features: For general purpose applications with environmental exposure, or those requiring...$314.95 -
304200 McDonnell & Miller Head Gasket
McDonnell & Miller
$12.95304200 McDonnell & Miller Head Gasket. This Item Usually Ships The Same Day!$12.95 -
177251 McDonnell & Miller 157S-RLS-M-MD
McDonnell & Miller
$1,557.95177251 McDonnell & Miller 157S-RLS-M-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...$1,557.95 -
172813 McDonnell & Miller 157S-M-MD Hi Pressure Level Control
McDonnell & Miller
$1,418.95172813 McDonnell & Miller 157S-M-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Features For boilers of any steaming capacity Model 175412 - 157S-M-MD Monel bellows provides corrosion resistance Snap...$1,418.95 -
173702 McDonnell & Miller Hi Pressure Level Control 157S-A
McDonnell & Miller
$1,421.95173702 McDonnell & Miller Hi Pressure Level Control 157S-A. Information: 173702 McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Model 173702 - 157S-A Monel bellows provides corrosion...$1,421.95 -
129802 McDonnell & Miller LWCO 42S-N Pump Controller
McDonnell & Miller
$1,089.95129802 McDonnell & Miller LWCO 42S-N Pump Controller. Instruction Manual For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column For boilers of any steaming capacity Monel bellows...$1,089.95 -
143700 McDonnell & Miller 64A Mechanical Low Water Cut Off
McDonnell & Miller
$1,064.95143700 McDonnell & Miller 64A Mechanical Low Water Cut Off. Mechanical LWCO For Steam Boilers. Mcdonnell & Miller LWCO Series 64 Instruction Manual Features: Optional manual reset is available For boilers of any steaming...$1,064.95 -
136000 McDonnell & Miller 51-S-2-M Mechanical Water Feeder
McDonnell & Miller
$1,721.95136000 McDonnell & Miller 51-S-2-M Mechanical Water Feeder. Information: Mcdonnell & Miller 136000 Series 51-S-2-M Instruction Manual Features: Proportional feed action Maximum water supply pressure 100 psi (7 kg/cm2) Maximum inlet...$1,721.95 -
176212 McDonnell & Miller Mechanical Water Feeder 47X-2
McDonnell & Miller
$1,121.95176212 McDonnell & Miller Mechanical Water Feeder 47X-2. This Item Usually Ships The Same Day!$1,121.95 -
133400 McDonnell & Miller Mechanical Water Feeder 47-X
McDonnell & Miller
$854.95133400 McDonnell & Miller Mechanical Water Feeder 47-X. This Item Usually Ships The Same Day!$854.95