McDonnell & Miller

McDonnell & Miller delivers trusted boiler control and safety solutions with over 100 years of proven reliability. Their comprehensive lineup includes boiler controls, power switches, airflow switches, level controls, and safety valves engineered for demanding HVAC applications. Get professional-grade McDonnell & Miller products at competitive prices from Jackson Systems today.

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Showing 49–96 of 241 resultsSorted by popularity

Electronic Low Water Cut-Off without Probe, 144704

McDonnell & Miller

SKU: FPC-1000
$232.10
MSRP: $266.92
You save 15%
Xylem-McDonnell & Miller FPC-1000 Electronic Low Water Cut-Off w/o Probe 144704 quantity
Low Water Cut Off & Pump Controller for Steam Boilers, 250 PSI

McDonnell & Miller

SKU: 94-M-HD
$2,395.16
MSRP: $2,754.43
You save 15%
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Low Water Cut Off & Pump Controller, 250 PSI Steam Boiler

McDonnell & Miller

SKU: 94-M
$2,482.36
MSRP: $2,854.71
You save 15%
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Low Water Cut Off & Pump Controller for Steam Boilers, 250 PSI

McDonnell & Miller

SKU: 94-HDLS
$1,222.98
MSRP: $1,406.43
You save 15%
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Combination Low Water Cut Off & Pump Controller, 250 PSI, Two SPDT

McDonnell & Miller

SKU: 94-HD
$2,395.16
MSRP: $2,754.43
You save 15%
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Low Water Cut Off & Pump Controller, Two SPDT Switches, 250 PSI

McDonnell & Miller

SKU: 94-A
$2,714.66
MSRP: $3,121.86
You save 15%
Xylem-McDonnell & Miller 94-A Low Water Cut Off & Pump Controller, 250 PSI (165500) quantity
Combination Low Water Cut Off & Pump Controller, 250 PSI, Head Only

McDonnell & Miller

SKU: 94-7B-HD
$3,197.36
MSRP: $3,676.96
You save 15%
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Combination Low Water Cut Off & Pump Controller, 250 PSI Max

McDonnell & Miller

SKU: 94-7B
$3,800.99
MSRP: $4,371.14
You save 15%
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Electronic Outside Air Temperature Sensor, 20k Ohm NTC

McDonnell & Miller

SKU: 94
$201.49
MSRP: $231.71
You save 15%
Xylem-McDonnell & Miller 94 Electronic Outside Air Temperature Sensor, 20k Ohm NTC quantity
Combo Low Water Cut Off & Pump Controller, Dual SPDT, 150 PSI Steam

McDonnell & Miller

SKU: 93-M-HD
$2,156.34
MSRP: $2,479.79
You save 15%
McDonnell & Miller 93-M-HD Combo Low Water Cut Off & Pump Controller, 150 PSI, SKU 93-M-HD quantity
Combination Low Water Cut Off & Pump Controller, 150 PSI Steam Boiler

McDonnell & Miller

SKU: 93-M
$2,200.31
MSRP: $2,530.36
You save 15%
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Combination Low Water Cut-Off & Pump Controller, 150 PSI, Head Only

McDonnell & Miller

SKU: 93-HDLS
$1,204.79
MSRP: $1,385.51
You save 15%
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Combination Low Water Cut Off & Pump Controller, 150 PSI, Head Only

McDonnell & Miller

SKU: 93-HD
$1,942.53
MSRP: $2,233.91
You save 15%
Xylem-McDonnell & Miller 93-HD Combination Low Water Cut Off & Pump Controller, 150 PSI, Head Mechanism Only quantity
Low Water Cut Off & Pump Controller, Manual Reset, 150 PSI Max

McDonnell & Miller

SKU: 93-7B-M
$2,889.00
MSRP: $3,333.32
You save 13%
Xylem-McDonnell & Miller 93-7B-M Low Water Cut Off & Pump Controller 150 PSI quantity
Low Water Cut Off & Pump Controller for Steam Boilers, 150 PSI

McDonnell & Miller

SKU: 93-7B-HD
$2,866.78
MSRP: $3,296.80
You save 15%
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Combination Low Water Cut Off & Pump Controller, 150 PSI Max

McDonnell & Miller

SKU: 93-7B
$2,853.88
MSRP: $3,281.96
You save 15%
Xylem-McDonnell & Miller 93-7B Combination Low Water Cut Off & Pump Controller quantity
Combo Low Water Cut Off & Pump Controller, Two SPDT Switches, 150 PSI

McDonnell & Miller

SKU: 93
$2,019.85
MSRP: $2,322.83
You save 15%
Xylem-McDonnell & Miller 93 Combo Low Water Cut Off & Pump Controller, 150 PSI, SKU 93 quantity
Make-Up Water Feeder for Receiver Tanks with Mounting Flange, 25 PSI

McDonnell & Miller

SKU: 847
$1,249.91
MSRP: $1,437.40
You save 15%
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Remote Mount Liquid Level Control, NEMA 4X Enclosure, 4-Probe

McDonnell & Miller

SKU: 750B-C-4
$908.09
MSRP: $1,044.30
You save 15%
Xylem-McDonnell & Miller 750B-C-4 Remote Mount Liquid Level Control, NEMA 4X, 4-Probe quantity
Remote Mount Liquid Level Control, NEMA 4X, 3 Probes

McDonnell & Miller

SKU: 750B-C-3
$808.09
MSRP: $929.30
You save 15%
Xylem-McDonnell & Miller 750B-C-3 Remote Mount Liquid Level Control, NEMA 4X, 3 Probes quantity
120V Manual Reset High Water Cut Off for Boilers w/ Test Switch

McDonnell & Miller

SKU: 750-HW-MT-120
$259.56
MSRP: $298.49
You save 15%
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Potentiometer Proportional Manual Reset Low Water Cut Off Switch

McDonnell & Miller

SKU: 7-BM
$2,054.74
MSRP: $2,362.95
You save 15%
Xylem-McDonnell & Miller 7-BM Potentiometer Proportional Manual Reset Low Water Cut Off Switch | SKU: 7-BM quantity
Potentiometer Proportional Auto Reset Low Water Cut Off Switch

McDonnell & Miller

SKU: 7-B
$2,054.74
MSRP: $2,362.95
You save 15%
Xylem-McDonnell & Miller 7-B Potentiometer Proportional Auto Reset Low Water Cut Off Switch quantity
Minipeeper UV Flame Detector, 96″ Lead, 0–215°F, 1/2″ Sighting Pipe

McDonnell & Miller

SKU: 69
$372.58
MSRP: $428.47
You save 15%
McDonnell & Miller 69 Minipeeper Ultraviolet Flame Detector for Coal, Gas & Oil Burners quantity
3/4″ NPT, 20 PSI Max, Auto Reset Mechanical Low Water Cut Off

McDonnell & Miller

SKU: 67-LQHU
$516.99
MSRP: $594.54
You save 15%
Xylem-McDonnell & Miller 67-LQHU 3/4" NPT Auto Reset Mechanical Low Water Cut Off quantity
3/4″ NPT Auto Reset Mechanical Low Water Cut Off, 20 PSI Max

McDonnell & Miller

SKU: 67-G
$670.08
MSRP: $770.59
You save 15%
Xylem-McDonnell & Miller 67-G 3/4" NPT Auto Reset Mechanical Low Water Cut Off quantity
3/4″ NPT Auto Reset Mechanical Low Water Cut Off for Steam Boilers

McDonnell & Miller

SKU: 67
$636.14
MSRP: $731.56
You save 15%
Xylem-McDonnell & Miller 67 3/4" NPT Auto Reset Low Water Cut Off, 20 PSI, SKU 67 quantity
1HP 120/240V 1-Phase CCW ECM Replacement Motor

McDonnell & Miller

SKU: 6667
$1,319.38
MSRP: $1,517.29
You save 15%
Xylem-McDonnell & Miller 6667 1HP 120/240V 1PH CCW ECM Motor quantity
Auto Reset Mechanical Low Water Cut Off, 50 PSI Max, Head Only

McDonnell & Miller

SKU: 64-HD
$636.14
MSRP: $731.56
You save 15%
Xylem-McDonnell & Miller 64-HD Auto Reset Mechanical Low Water Cut Off, 50 PSI, Head Only (144400) quantity
1″ NPT Auto Reset Mechanical Low Water Cut Off, 50 PSI Max

McDonnell & Miller

SKU: 64-B
$752.89
MSRP: $865.82
You save 15%
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1″ NPT Auto Reset Mechanical Low Water Cut Off, 50 PSI Max

McDonnell & Miller

SKU: 64-A
$1,153.24
MSRP: $1,326.23
You save 15%
McDonnell & Miller 64-A 1" NPT Auto Reset Mechanical Low Water Cut Off | SKU: 64-A quantity
1″ NPT Auto Reset Mechanical Low Water Cut Off, 50 PSI Max

McDonnell & Miller

SKU: 64
$712.71
MSRP: $819.62
You save 15%
Xylem-McDonnell & Miller 64 1" NPT Auto Reset Mechanical Low Water Cut Off #143600 quantity
Manual Reset Mechanical Low Water Cut Off, 50 PSI, Head Only

McDonnell & Miller

SKU: 63-M-HD
$790.80
MSRP: $909.42
You save 15%
McDonnell & Miller 63-M-HD Manual Reset Low Water Cut Off, 50 PSI, SKU 63-M-HD quantity
1″ NPT, 50 PSI Max Manual Reset Mechanical Low Water Cut Off

McDonnell & Miller

SKU: 63-M
$849.19
MSRP: $976.57
You save 15%
Xylem-McDonnell & Miller 63-M 1" NPT Manual Reset Mechanical Low Water Cut Off quantity
Auto Reset Mechanical Low Water Cut Off, 50 PSI Max, Head Only

McDonnell & Miller

SKU: 63-HD
$790.80
MSRP: $909.42
You save 15%
Xylem-McDonnell & Miller 63-HD Auto Reset Mechanical Low Water Cut Off, 50 PSI, Head Only (142600) quantity
1″ NPT, 50 PSI Max, Manual Reset Mechanical Low Water Cut Off

McDonnell & Miller

SKU: 63-B-M
$886.49
MSRP: $1,019.46
You save 15%
Xylem-McDonnell & Miller 63-B-M 1" NPT 50 PSI Manual Reset Low Water Cut Off quantity
1″ NPT, 50 PSI Max Auto Reset Mechanical Low Water Cut Off

McDonnell & Miller

SKU: 63-B
$933.64
MSRP: $1,073.69
You save 15%
Xylem-McDonnell & Miller 63-B 1" NPT 50 PSI Auto Reset Low Water Cut Off quantity
1″ NPT, 50 PSI Auto Reset Mechanical Low Water Cut Off

McDonnell & Miller

SKU: 63
$849.19
MSRP: $976.57
You save 15%
McDonnell & Miller 63 1" NPT 50 PSI Auto Reset Mechanical Low Water Cut Off (142400) quantity
Mechanical Low Water Cut Off for Steam Boilers, 20 PSI Max

McDonnell & Miller

SKU: 61-HD
$588.38
MSRP: $676.64
You save 15%
Xylem-McDonnell & Miller 61-HD Mechanical Low Water Cut Off, 20 PSI, SKU 61-HD quantity
Infrared Flame Detector, Lead Sulfide, 48″ Lead, 3/4″ NPT

McDonnell & Miller

SKU: 61
$896.99
MSRP: $1,031.54
You save 15%
McDonnell & Miller 61 Infrared Flame Detector, Lead Sulfide, 3/4" NPT quantity
Make-Up Water Feeder for Steam Systems, 25 PSI, Head Only

McDonnell & Miller

SKU: 551-S-HD
$2,118.43
MSRP: $2,436.19
You save 15%
McDonnell & Miller 551-S-HD Make-Up Water Feeder, 25 PSI, Head Mechanism Only (136600) quantity
Make-Up Water Feeder for Steam Systems, 25 PSI, 1″ NPT

McDonnell & Miller

SKU: 551-S
$2,274.60
MSRP: $2,615.79
You save 15%
Xylem-McDonnell & Miller 551-S Make-Up Water Feeder, 25 PSI, 1" NPT (136400) quantity
Mechanical Water Feeder, 35 PSI Max, Steam & Hot Water Boilers, Head Only

McDonnell & Miller

SKU: 51-S-HD
$1,697.61
MSRP: $1,952.25
You save 15%
Xylem-McDonnell & Miller 51-S-HD Mechanical Water Feeder, 35 PSI, Head Only (135800) quantity
Mechanical Water Feeder & Low Water Cutoff, 35 PSI, SPDT Switch Head

McDonnell & Miller

SKU: 51-S-2-HD
$2,031.00
MSRP: $2,335.65
You save 15%
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Mechanical Water Feeder & Low Water Cut Off, 35 PSI, 1″ NPT

McDonnell & Miller

SKU: 51-S-2
$2,159.36
MSRP: $2,483.26
You save 15%
Xylem-McDonnell & Miller 51-S-2 Mechanical Water Feeder & Low Water Cut Off, 35 PSI, 1" NPT (Part No. 135900) quantity
Mechanical Water Feeder for Steam & Hot Water Boilers, 35 PSI, 1″ NPT

McDonnell & Miller

SKU: 51-S
$1,925.08
MSRP: $2,213.84
You save 15%
Xylem-McDonnell & Miller 51-S Mechanical Water Feeder, 35 PSI, 1" NPT (135600) quantity
Mechanical Water Feeder for Steam & Hot Water Boilers, Head Only

McDonnell & Miller

SKU: 51-HD
$1,443.63
MSRP: $1,660.17
You save 15%
McDonnell & Miller 51-HD Mechanical Water Feeder, 35 PSI Max, Head Only (134900) quantity
Mechanical Water Feeder & Low Water Cut Off, 35 PSI, 1″ NPT

McDonnell & Miller

SKU: 51-B-2M
$2,075.74
MSRP: $2,387.10
You save 15%
Xylem-McDonnell & Miller 51-B-2M Mechanical Water Feeder & Low Water Cut Off, 35 PSI, 1" NPT quantity

McDonnell & Miller

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