I just joined the forum as I discovered it when I Googled Hitzer 503. I want to thank Keith, Pete69, DaveMich and others for their helpful comments and advice. I installed a Hitzer 503 on 30 Dec 12, having heated an old 2-story frame house in W. PA with a 1955 oil furnace my parents installed. I took over the house upon my mom's passing in 2009 and heated the winters of 2009-2010 through Dec 2012 with the oil furnace. My mom kept the thermostat at 70-72 but I cranked it back to 66 to save fuel. Nonetheless, my fuel bills were $4,000, $4,000 and $3,500, respectively for the 3 seasons I owned the house. Meanwhile, I rent an 1890s farmhouse that is even more poorly insulated than my house and my tenant asked to install a wood or coal burner to help defray costs. He did the research and he and I installed a Hitzer 50-93 in Nov 12. I was so impressed that I ordered a Hitzer 503 that Hitzer gladly customized to fit my 29 3/4" non-standard fireplace opening. By the time I got the Hitzer, I had heated Oct-Dec with oil that cost me about $500. My heating bill for the remainder of the 2012-2013 heating season was about $400, burning mostly wood from my farm that consisted of hardwood deadfall, blow-down and dead standing trees. I tried burning hard coal but with limited success. This year, however, I was determined to use hard nut coal on the coldest days and finally mastered the technique that I found requires way more draft and coal than I was using in 2012. I now use wood for days that are 20 deg or above and coal on colder days which we have had plenty of this winter. The house is about 2000 sq. ft. and I can adequately heat the main floor consisting of 3 rooms to a toasty 70+ and I get sufficient heat upstairs for comfortable sleeping. The downside is the oil furnace rarely comes on so the basement stays at a nominal 50 deg. I am very satisfied with my Hitzer. I have not experienced poor workmanship cited by Keith and no rattling fans cited by several respondents. The only thing I missed was a thermostat to shut off the fans at a certain temperature. Recently the thermodisc that shuts off the fans when stove temperature falls below a given temperature (I think 120) seems to have failed and my Hitzer dealer has sent me a new one. Hopefully, that will solve the problem. I jury-rigged a thermostat control to shut off the fans by mounting an electric baseboard heater control in a switch box with an outlet mounted beside it. I plug the Hitzer into that outlet and the homemade device into the wall and set it in an adjacent room. When the temperature in that room reaches a desired temperature, it shuts off the Hitzer fan. When it is really cold, however, the Hitzer runs continuously to keep the house warm. With no wind and temperatures 15 deg and above, I have no problem heating and usually have to throttle back the unit to keep the room where the Hitzer is between 75-80 even when burning wood, so I am 10 deg more comfortable than when I was heating with oil at a fraction of the cost. In summary, this is my first venture into the world of coal/wood stoves but I am very pleased with my Hitzer that amortized the first season by March (3 mos after installation). I estimate I will use about 2400 lbs of coal and about 2 cords of wood this season and this has been a harsh winter. The coal cost me $305/2400 lbs in 40 lb bags and the wood that I cut myself is virtually free except for some chainsaw gas and diesel in my tractor to haul it in.