morning,new guy here.i am on my second season with and alternate heating system woc 40 indoor boiler.I have severe creosote build up in chimney and firebox.have had problem from first year thought maybe learning curve.Outside of chimney is black with stuff running down.The wood I am burning is well seasoned.I knoiw thereis a lot of idle time.house is only 1700 sq ft if I try and run it hotter the house gets really hot and boiler will overheat.Any help would be great.Im sure I am missing something.If so ask away and will try and give as much info as I can.Thanks ed.