The WG boiler has a small mechanical timer dial that you turn on for a specified period of time allowing the induced draft fan to remove gasses, etc from the burn box before opening the door. It's supposed to wind itself down and turn off the fan/stop the burn(unless temp dictates otherwise) but it has failed a few times recently. I will make sure it winds down but other family memebrs forget to do this and we risk the boiler hitting the high temp and shutting down...which I would like to avoid for obvious reasons. This is the 2nd timer I've tried(both the same type) and would like to find an electric one to take it's place but am not sure where to look or just what I am looking for......?