Sometimes I am still baffled. 5am unit on house calling for heat and fire burning nicely, I load it 3/4 up 7am unit shut down house demand met 11am unit turns on, not sure if house needed heat or unit was maintaining it's own temp. wife checked it said fire was burning nice and a lot of wood in there. 5;30 pm I come home unit is on and fire is burning nicely same wood from 7am and 11am 9;30 pm house is calling for heat unit comes on I go out to look and water temp is down to 150* and there is the same wood from before but there is NO FIRE Damn Gremlins, what the heck. How can the fire relite at 11 and 5:30 but not at 9:30 Oh well the world may never know. I guess its just the laws of physics at work.