you need a 3-pole contactor that can stand up to high-amperage demands without premature pitting or coil failure

as it provides a higher ceiling for electrical stress

R43107-001

provided appropriate thermal isolation is used

Lochinvar & A.O. Smith 100148403 Limit Switch 328140-751 you need a 3-pole contactorThe Lochinvar & A. O. Smith 100148403 Limit Switch is a critical OEM replacement part designed for high limit temperature protection in commercial water heaters, boilers, and pool heaters. This 175 degree high limit assembly monitors the heat exchanger or outlet water temperature, providing an essential safety cutoff to prevent thermal runaway and equipment damage. Engineered for HVAC systems requiring precise thermal regulation, the 100148403 ensures