McDonnell & Miller Low Water Cut-Offs are specially designed to protect 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.

McDonnell & Miller General Catalogue

Low Water Cut Off
Mechanical For Steam Boiler

1575-series-119x300

RB-122-E
Low Water Cut-Off

RB-24E
Low Water Cut-Off

RBT-3000
LWCO & Fuel Economizer

Series 150S/157S
Low Water Cut Off/Pump Controler

Series 42S
Low Water Cut-Off/Pump Controllers

Series 61
Low Water Cut-Offs

Series 63
Low Water Cut-Offs

Series63

Series 64
Low Water Cut-Offs

Series 67
Low Water Cut-Offs

Series 69
Built-In Low Water Cut-Offs

Series 750 and 751P/752P
Low Water Cut-Offs

M&M Series 750-HW-MT-120 manual

Series 764
Low Water Cut-Offs

Series764
Series 764

Series 767
Low Water Cut-Offs

Series767

Series 93/94/193/194
Low Water Cut Off/Pump Controllers

Series193

Series 93/94 193/194

Series PSE Probe
Type LWCO

SeriesPSE-800

Series PSE-800-M Probe
Type LWCO

PSE-800-298x300

New Series 150E for Commercial and Industrial Steam BoilersMcDonnell and Miller, BearTrap, Boiler Controls, Guard Dog, Flow Switches, Liquid Level Controls, low water cut offs, Water Feeders, valves
Series 150E