Any company that would put this out in the field and charges customers for the required repairs does not deserve to be in business. I am an engineer in the fabricating business and the design and workmanship on this unit are terrible. Not one year has gone by without a major failure first the door rotted, then pump impellers melting, firebox rotting, replacing blowers, replacing controllers, solenoids, water level switches, transformers, and many of these numerous times. Now 9 years in and the inside looks like a sprinkler in the firebox again. I used all the ashtrol as recommended and was religious about keeping the ph of the water correct. Have you ever heard you can't help Stupid? Well, the engineer that built this boiler designed it with a 1/16 wall on the firebox. There is nothing any of us owners can do to fix that stupid decision. So they have a 25-year warranty that covers only material. Like they will pay a couple of bucks for a plate and weld wire while you pay $100/hr for an on-site welder that is good enough to weld on paper thin rotting walls. By the way, the inside of my boiler looks smooth and pristine. I know because I cut a chunk of the wall out large enough to get a good look at it 6"x12". The trouble is the firebox side is eroding even with the use of ashtrol. If you start with .060 walls it does not take much erosion until the leaks start. Now I have repaired over 25 leaks. Many across the bottom because the welding on my unit was so undercut that it leaks at each ripple in the weld. It is finally spring here and I will throw this post away for good. 10 years and 1 month in and at least 100 repairs.