I need advice. I have a Thermodynamics direct vent boiler in my basement. It works great. It is however leaving a terrible looking soot stain on my siding. It has been serviced and I'm told the soot is normal. My hearing guy recommends removing the direct vent and installing a traditional thru the wall Class A stainless chimney. He was not aware of any other options. I forgot to mention that this is a backup system for a heatpump.
What do you guys think?