To maintain AER compliance and equipment safety

Utilizing a Single Pole Single Throw (SPST) snap-acting switch

This genuine OEM replacement part is the direct replacement for HK02AC027

The McDonnell & Miller 354141 is the specific long barrel replacement for the PA-800-U assembly

Lochinvar & A.O. Smith 100108951 Thermostat 321894-706 To maintain AER compliance andThe Lochinvar & A. O. Smith 100108951 Thermostat is a critical OEM replacement part designed for high performance commercial and residential electric water heaters. As a heavy duty upper thermostat, it provides precise temperature control to ensure the heating elements cycle correctly and maintain system efficiency. This thermal regulator comes integrated with an Emergency Cut Off (ECO) safety switch, which manually trips to prevent overheating