Xylem 150S-MD Low Water Cut-Off and Pump Controller with Maximum Differential

The Xylem 150S-MD (McDonnell & Miller brand) is a combination low water cut-off and pump controller designed for commercial and industrial low or high pressure boiler applications. This model features maximum differential operation that prevents nuisance burner shutdowns in low pressure applications, making it ideal for demanding steam boiler systems.

Key Features:

• Suitable for boilers of any steaming capacity
• Monel bellows construction provides superior corrosion resistance
• Snap action switches rated for high temperature service
• Single pole, single throw switch for pump control
• Single pole, double throw switch for low water cut-off and alarm actuation
• Maximum operating pressure of 150 psi (10.5 kg/cm²)
• 120/240 VAC operation with automatic reset

This float-type mechanical controller ensures reliable boiler protection by automatically shutting down the burner when water levels drop below safe operating thresholds. The rugged construction and precision engineering make it a trusted choice for HVAC professionals and boiler technicians.