Hello all, and thank you for having such a great resourse available in the 'net!
I own a house built in 1910. Currently there are three gas burning products that use the Chimney. 1) a 1955 Janitrol floor heater downstairs(yep ..still works ) 2) a water heater, and 3) a newer model forced hot air upstars(vintage 1975-1978) furnace.
My goal is to upgrade to more modern units. I have had multiple estimates for HP with electric furnaces , and gas furnace with ac.
My question.... is it safe to put 80% efficient furnaces into my chimney?