I just completed the installation of my Buderus G201 Logano Wood/Coal Boiler. I have about 4 days experience with the unit so far. I have a poorly insulated 3300 sq foot ranch with cast iron baseboard radiators. Yesterday I had the unit working on coal perfectly for 24 hours. Morning outside tempurature was 8 degrees f and daytime temp was 27 f. By the end of the day my entire house was low 70's. Draft seems to be a problem at start up and upon accumlation of ash. I will continue to tweek to determine how to shake, scrape, riddle, raddle, paddle, rock, roll or what ever to drop the ash and maintain the hot bed of coals.