Rayson Arce
New Member
I just replaced our gas water heater with an AO Smith 40gal 40,000 but water heater. Once I installed it I noticed it wasn't venting properly so I replaced the old vent pipe with Type B double wall pipe, and checked the chimney which was clogged up as well. I cleaned it out, and after some research I believe I need to install a chimney liner. Since the water heater is the only thing using the chimney to vent. So 2 questions...what size of chimney is too big for a 3" flue pipe to vent into and assuming mine is too big do I have to use a stainless steel chimney liner or can I use aluminum? I'm sure you guys know the stainless ones are quite a bit more expensive and I want to make sure I do it right.