I have a Ruud achiever 90+. Tough furnace. In summer 2007 we had 10 inches of rain in a 7 hour period over night. record rainfall in nw Ohio woke up with 2 feet of water in basement. All the electronics were underwater. i let it dry for 2 months and then in the fall I fired it up and it worked fine. In 2012 I finally had to have the mother board replaced. the tech said that the water likely started some corrosion that eventually got it....but that is the only expense on that furnce in th 13 years I have had it.
I will look that up. My problem is that I need reliable back up after long down time.
I was watching a neighbor get a fill up at 3.70 a gallon. My heating bill, with wood has run around $1200 a season plus $600 for cooking and hot water, propane.