Got off to a rough start due to the first stove that shipped arrived damaged. Comfortbilt sent another out right away. I ordered the 4” flue kit when only the 3” was required. This was due to the elevation I reside at in Montana. I forgot to confirm if the kit came with a reducer fitting (3” to 4”, Duravent calls it an increaser) coming off the unit. It was only noticed when I started the flue to stove connection. After contacting Comfortbilt they sent one out right away at no charge. I put the sales person through the course and Comfortbilt came through each time. I haven’t had the need to contact the company for any troubleshooting issues or problems after startup. I have been an HVAC specialist for over 25 years. I was able to install the stove myself. I did have an acquaintance who owns his own HVAC company scheduled to help with the install but had to cancel due to the first stove being returned. I would highly recommend buying a Comfortbilt pellet stove.