always verify your model number to avoid stroke length issues or improper seating

Ensure the rod is properly positioned within the flame’s path and that the porcelain insulator is clean and free of cracks to prevent signal grounding

Maintenance Ready: The integrated 2-position on/off switch and LED status indicator allow for rapid troubleshooting and safe component replacement

High Compatibility: Universal SPDT contacts and 120V-277V AC rating ensure integration with most burner control circuits

making it a standard choice for maintaining peak combustion efficiency in oil-fired boilers and furnaces

McDonnell & Miller 750-HW-MT-120 Control 30067439-890 always verify your model numberThe McDonnell & Miller 750 HW MT 120 (Part Number 176236) is a heavy duty 120Vac high water cut off designed to provide failsafe protection for steam boilers and hot water heating systems. Engineered for commercial and industrial environments, this manual reset control prevents hazardous overfill conditions by interrupting the burner circuit or water feeder pumps the moment water levels exceed the safety probe's threshold. Unlike automatic reset