I'm a NewYorkah, but I'll post pics when my boiler gets set up. If you want some boring pictures of the building I'm housing it in, I'll post those when I'm done painting it
His boiler model is UL listed. It's buried in one of the threads. As far as efficiency goes, all you need to do is watch the temp. rise during the burn cycle. It really is a simple, optimizable system. I figured I'd go Garn until I took the hour drive to his shop and checked his product out. There are many local owners in my area (and more to come shortly) that attest to the durability and reliability of his design. It's not small, not inexpensive, but also not labor-intensive or built with any fragile components.
Like I said, if you want some building pics, I'll post those. I designed an 18x24' building that complements our house. It has 10' ceilings with r-30 insulation, attic space for misc. storage, a 9x7 garage door for wood loading, and two 4.5x2.5' awning windows on the south side for ventilation. I wanted my wood to be stored under lock and key, and this will hold about 5-6 cords with plenty of clearance around the 9x7' Switzer 1450.
I'm not sure when the boiler will be done, but I'm not pushing Gary. I think the thread I started pushed him enough, so I'm just hanging back patiently.
I will most likely get a Metalbestos double-wall chimney shortly, but I haven't done exact measuremants as to how much I need. (too much painting)
It sounds as though there are many viable choices for clean-burning boilers out there, so choose what you like. I just wanted my storage and firebox integrated into one unit, which left me only a couple of options. I went with the local guy.
Chris