Around 12 noon on Sunday, Katonah Firefighters were dispatched to a reported chimney fire at a home under substantial renovation on Oak Road. Car 2212, Engine 116, Engine 115, and Ladder 39 responded. Upon arrival, crews found smoke coming from the chimney and a light smoke condition in the residence. Engine 115 connected to a hydrant and prepared to supply water to Engine 116 if needed. Entry was gained to the residence and crews searched for the source of the smoke. Crews determined the smoke was coming from the boiler and confirmed there was no extension to the rest of the structure. The boiler was shut off and properly secured. Katonah units were back in service by about 1 PM.