Mounting outside would be easy for the exhaust venting. Subject to freezing as well. Laundry room has an outside wall, but the piping and gas lines are on the inside wall. I do want to get the 18 year old 75 gallon water bomb out of the attic... Had one go once, in the garage, but still was not pretty.
Look into a power vent for the laundry room. Still need the flu study. Hart & Cooley has a table on the internet for flu calculations. It must be installed correctly, Operation is silent, Failure is silent, Death from carbon monoxide is silent.
