McDonnell & Miller 150S-M Pump Controller R-410A What is the difference between

What is the difference between Lennox X6667 and X666701

Key Benefits Field-Selectable Modulation: Supports proportional

Broad Operating Range: Sustains reliable performance in ambient temperatures ranging from -40°F to +150°F

and Bakers Pride units

McDonnell & Miller 150S-M Pump Controller R-410A What is the difference betweenThe McDonnell & Miller 150S M is a commercial grade float type combination low water cut off and pump controller designed for steam boilers in high pressure industrial applications. Engineered for systems with a maximum pressure of 150 psi, this unit features a manual reset mechanism, ensuring that the burner circuit remains locked out following a low water event until a technician can verify the system's safety. The internal Monel bellows provides