We replaced our oil burner with natural gas (not the high efficiency type) and it appears the cooler exhaust is causing heavy condensation near the roof. Chimney company wants to install a stainless liner but I hear aluminum is an option since this is natural gas. Will aluminum work? Will it last?
I would consider stainless preferable in every way. However, there evidently are UL listed aluminum liners for venting gas appliances. I'd still put stainless in my house (if I had a gas line on my street.)