So my system is up and running, a few stats on it are: Paxo 25 with OEM RK-2001UA controller. 830-850gal Unpressurized storage. Radiant heat manifold with individual actuators, Tekmar 356 Injection mixing outdoor reset. I am firing it now and the system is performing pretty much amazing, but I havent come up with a control scheme yet to tell the boiler to shut down when the burn cycle is over. I would like to be able to load it with wood at night and shut down when its burned its cycle into storage in the middle of the night. But I have waken most mornings to the blower still running when the fire burned out long before. Only a few random times the RK displaying "FUEL" and the blower is off, I think that fact that it has storage that it keeps circulating from throws off the logic in the RK and its not going to operate the way I wish I could. I read last year of some people using a exhaust probe but I cant find reference to it again. Or would another option be a timer like the older Garns, and just test how long the burn is and use a simple 120V timer switch?