Yep. My furnace is purring away! I had a new propane hot water heater installed to take place of electric one that came with house. Master plumber is a great gent, and he was really intrigued by my coal furnace purring away while he was working. He burns wood to heat his home and is going to check and see if he can get heavy duty shaker grates that might allow him to use coal. Since he's a plumbing/heating/cooling guy, I figure he knows what he's doing, but he did think burning coal was too cool for school, and not having to get up at night to stoke wood furnace!