Dreamer, I have burned both a Central Boiler Classic and now their Eclassic 2400 gasser the last 2 winters. I would highly recommend either one. At -30 below I got/get 24 hour burn times with both units, on my 2,300 sq ft house. I'm sure that could vary depending upon insulation. I burn 24 inch lengths and 3"-8" diameters worked great in the Classic and work well in my E2400 as long as they are well seasoned. The gassers really require seasoned wood to perform well. If not much time for seasoning, splitting will speed the dry time. (Seasoned or Dry wood just a matter of terminology I think) I also find it works the best to load for a 24 hour burn time based on outdoor temperature and don't overload.  The gasser model has cut my wood consumption from 10-11 full cord per winter, down to      5 1/2 cord my first season and just 4 1/2 cord during this past warm winter. I was burning a good hard wood for the most part, but I have burned soft wood during the fall and it worked well. It just won't give you the btu of a hard wood, which is why I burn it early in the heating season. The Eclassic requires a little more maintenence than the Classic, but worth it for the wood savings in my mind. I really like the vertical heat exchangers that pretty much clean themselves, as the ash drops down into the main cleanout. From what I've read, the gassers with horizontal tubes require them to be cleaned every 7-10 days and may require more cleanout time.  Both CB models are still available and shown on their website. They also show video of the gasser running on their Eclassic advantage video. Check them out if you haven't already in your research.