Have to say I was concerned but luckily no problems at all. No smoke in the house or smells, and when the power came back on it started right up again and picked up where it left off. Of course, we got the back-up battery and cable after that all happened, but it is now hooked up so we are good for heat if it happens again. Guess we have enough vertical venting to keep the smoke moving. At least something was done right on install.