This will be my second season on a C375. I do a lot of installations for the local dealer who carries Heatmaster and Crown Royal, previously P&M, and talk to a lot of my other customers about the likes/dislikes of their previous (sometimes current) boilers. Armed with that information and a few personal preferences, I settled on the C series and would do it again in a heartbeat. I burn almost exclusively red oak, and last year burned approximately 7-8 cord, but had a couple loads of rotten crap that needed to get disposed of. I hauled 9 in this year and hope it'll last the season but I'm fairly certain I'll have some left over. Been using about a wheelbarrow full a day with the 2800 sq ft house at 70, 1600 sq ft main shop at 50-60 depending what I'm doing, and 800 sq ft uninsulated lean-to at 45 so the Bobcat will start. Also heating the domestic in the house and occasional snowmelt in 160ft sidewalk. I installed a flue thermometer last week and so far the highest I've seen has been 480 degrees with a full load of cardboard. Regular old Oak fire at full tilt hangs right around 380-400, with a peak of about 430-440 for a minute or two in the middle. Pretty darn acceptable for a conventional in my eyes! Thermometer goes down to 100 and it hangs right at the bottom at idle. The triple pass flue passages could be easier to clean if I had to make a complaint, but otherwise I love everything about it