We've actually had a series of problems with this heater since the day it was installed (3 years ago). The original problem was that it would shut itself off if the flame was set any higher than low. We had a tech come out and look at it. He checked the install specs, gas pressure, venting, etc. He talked to Jotul tech people and they couldn't figure out the problem. We decided (foolishly) to live with it, as we figured we probably would use it on low most of the time anyway and we had to go out of town for an extended period the next day. It worked through that 1st winter (on low only). The following fall, when I turned it bback on for the season, I found that it was no longer taking commands from the thermostat. It was still within the 1 year warranty, so I called a service company again. Explained the problem, he said the switch had probably gone bad, and said that I could bypass the switch, and wire directly to the terminal block. Since we only controlled it with the thermostat that's exactly what I did. (I later found out the manuf. says not to do that). 3 weeks later (2 days after the warranty expired), it stated to shut off even when it was on low. Called the dealer, the gave us a larger orifice (it is converted for LP). That only made things worse. He gave a new t-pile - that made no differece at all. He said Jotul told him the was no way it could be the t-couple, so that was never tried. So, we turned on the electric heat for backup, and lived with it for that 2nd winter. Last year, it would no longer take any commands from the thermostat. I could turn it on or off at the switch. We put in a wood burning stove for primary heat, used electric for backup, and the gas for occasioal ambience, if it would stay on. The dealer didn't want to hear from me anymore, and I have zero confidence in the service company they use (apparently they're the only ones around). We're contractors and have no problem doing whatever needs to be done, but I need a diagnostician to help figure out the problem. I have been unable to find anyway to contact Jotul's tech services (my first thought) and the dealer wouldn't give me any contact numbers. Any thoughts, suggestions, information would be greatly appreciated. It's vented up and out with a 36" snorkel.