securing the long-term operational efficiency of liquid and suction line applications

Commercial Grade Performance: Built to meet the rigorous demands of industrial gas-fired heating systems

providing a moisture-resistant interface with standard instrumentation cables

ensuring stable performance across varying environmental conditions

McDonnell & Miller 51-S-HD Water Feeder 30067439-890 securing the long-term operational efficiencyThe McDonnell & Miller 51 S HD (Part Number 135800) is a heavy duty head mechanism only replacement designed specifically for Series 51 S mechanical water feeders. Engineered for high capacity systems up to 35,000 sq. ft., this unit is critical for maintaining precise water levels in low pressure steam and hot water boilers. Proportional feed action ensures a steady response to boiler demand, preventing the rapid cycling that stresses high volume