Hi-Limit Switches (Mechanical)

Mechanical hi-limit switches provide a physical, non-electronic backup that cuts power to the heater when water temperature reaches a critical level. Unlike electronic sensors, these switches operate independently of the control board, offering a reliable failsafe. Over time, mechanical hi-limit switches can trip and lose their ability to reset, requiring replacement. Spa Guy Parts carries direct replacement mechanical hi-limit switches for the most common spa heater assemblies. Order today—free shipping over $75.