It is highly recommended to stick to the cross-reference guide

This draft inducer motor is designed to safely exhaust combustion gases

This hermetic filter drier provides high flow capacity with minimal pressure drop

Whether you are installing a new primary control or looking for a drop-in replacement

Lochinvar & A.O. Smith 100208472 Kit 321894-706 It is highly recommended toThe Lochinvar & A. O. Smith 100208472 Kit is a critical integrated control kit engineered for high performance commercial boilers and water heaters. As a direct replacement for the legacy RLY20059 and 100167576 components, this central control board (CCB) manages all essential combustion and safety sequences from a single platform. Designed specifically for units with serial numbers beginning with 4015, including Lochinvar FB 2500, FBN2500, and FBL2