McDonnell & Miller 150S-MD-HD Low Water Cut-Off/Pump Controller Head Mechanism

McDonnell & Miller 150S-MD-HD Low Water Cut-Off/Pump Controller Head Mechanism delivers reliable control for boilers by quickly detecting low-water conditions and coordinating pump operation. This head mechanism serves as both a Low Water Cut-Off and a Pump Controller Head for the 150S Series, providing precise monitoring and safe startup, with a robust design that resists wear in hot boiler rooms. Includes Maximum Differential to balance protection and operation, helping extend equipment life and reduce nuisance trips.

• Dual-function design – Low Water Cut-Off and Pump Controller Head for dependable boiler protection.
• 150S Series compatibility – Easy replacement on existing systems.
• Maximum Differential – Optimizes response time and safety margins.
• Rugged construction – Durable operation in boiler-room environments.
• Easy installation – Minimizes downtime and fits standard piping with minimal adjustments.