the coil on the KZ-4000-5 is specifically designed for 120 Vac operation

For optimal performance and to prevent condensate accumulation

Is this compatible with both 115V and 230V systems

Direct OEM Match: Fully replaces the legacy AP13156 model with no modifications required for 9-inch ducting and venting systems

and 325-9 Series regulators

Lochinvar & A.O. Smith 100289450 O-Ring R-407A the coil on the KZ-4000-5The Lochinvar & A. O. Smith 100289450 O Ring is a critical sealing component designed for high performance gas valve assemblies and burner systems. As an OEM gas valve gasket replacement, this heavy duty sealing ring is engineered from advanced synthetic rubber to provide a precision fit across various hydronic heating platforms. This specific part number, 100289450, serves as the direct replacement for 100288891, ensuring backward compatibility for