Simplified Installation: Standard 3-leg mounting pattern and braze-on stubs streamline the change-out process

remove the fast-fill lever cap and loosen the lock nut

the DPDT relay configuration (Double Pole Double Throw) ensures reliable logic control without the relay itself included

it eliminates the sizing and alignment issues common with universal aftermarket alternatives

utilizing the genuine Reznor 220786 ensures factory-spec performance and proper alignment with existing mounting points

Lochinvar & A.O. Smith 100110717 Transformer 321042-401 Simplified Installation: Standard 3-leg mountingThe Lochinvar & A. O. Smith 100110717 Transformer is a critical low voltage power solution engineered for commercial water heaters and high efficiency boiler control circuits. This 120V to 24V step down transformer provides a steady 40 VA output, ensuring consistent performance for ignition modules, gas valves, and electronic controllers. Designed as a direct OEM replacement (also referenced as 9005901205), it features a primary voltage tap of 120V