My heatmor 200cs. Runs better with age! I'm into my 7th season. I think this is more due to experience. I recently met with a heatmor dealer at a farm show in Syracuse. He gave me some great tips and corrected a lot Of the errors I was making. In short , I was packing too much wood into the unit. Now I burn less, sooo much less wood. It is important to clean out with auger once a week. It's really no big deal, just do it an dump the ash around trees or in your garden. This year I completely turned off my oil fired furnace too, essentially in spite of reducing the temperature start degrees on the oil furnace , it still fired when there was a call to replenish hot water. I'm not wasting oil, or paying for oil I really don't need. And the heatmor replenishes the hot water tank just fine. I expect to heat my home and hot water on 6 cords of wood. Six kids and a 3500sf home. Not bad. If it gets real cold I will tick up the aqua stat to 190 until the colder weather subsides. In short, this is a great and simple unit.