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McDonnell & Miller 153896
McDonnell & Miller 153896 PS-851-M-120
120v Probe Type Low Water Cut-off for Hot Water Boiler

Product has been discontinued.
Please call us for a suitable alternate product.

Mon - Fri 8:30am - 5:00pm Central

The Series 850 controls provide continuous protection against low water conditions for residential, commercial and industrial applications. Increased probe sensitivity prevents nuisance shutdowns, and a new test feature diagnoses shorted probe problems at installation. The improved userfriendly diagnostic LEDs simplify installation and troubleshooting, ensuring proper operation and saving time.

Standard Features:

  • For residential and commercial applications
  • Manual reset
  • Green LED power and test light
  • Red LED shorted probe and low water indicator light
  • No blow-down required when mounted directly to boiler trappings
  • Meets ANSI specification Z21.13a
  • No lockout with loss of power if probe is in water

Maximum Temp Rating
250 °F 

Max Water Pressure
160 PSI 

Product Weight
2.7 lbs 

120 Volts 
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(800) 865-5931
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1901 N. Clybourn Avenue
Suite 200
Chicago, IL 60614
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