I bought a Harman Mark II with brass trim in October 2005 for $1673. I purchased this stove because I wanted a stove that did not require any electricity to operate. The dealer advised me not to purchase the larger Mark III because 'it would blow me out of the house.' He was right. The Mark II heats my 1700 square foot ranch style home very well, keeping my living room (where the stove is located) approximately 80F to 85F.
This stove drove me nuts for the first month of cold weather during which I tried to use it (Just as the very honest dealer in Port Jervis, from whom I purchased the stove, told me it would).
I use bagged nut coal purchased from Agel Coal in Scranton, PA for $170 a ton in 50 pound bags. I purchased and transported three tons for use this year, based on my burning approximately 3 to 4 cords of wood in previous years with a DutchWest Extra Large woodstove
The stove has a six inch vent outlet into which I inserted a 22 gauge welded tee outlet with tee runs to a bottom cap (to catch ash) and a 12" length of 22 gauge 6" stovepipe to a 6" x 8" increaser to an existing eight inch single walled stovepipe 4' long to a SS insulated Metalbestos flue approximately sixteen feet high. With the exception of the tee, the flue is straight up (the safest way to install a flue, and the way to insure the best draft possible). There is no barometric or flue damper because I choose to control the draft with the amount of air I let into the stove. I have learned through the years that if the flue temp is kept above 250F, there is no back puffing. The existing flue was used with wood stoves for many years.
It's now around Christmas, and I think I have learned enough about this set up to make it work reliably, albeit I still have much to learn. Initially, the fire would go out prematurely, because I was running it much too hot by allowing too much air into it. My set up works reliably with the draft control about 3/4 to 1-1/4 turns out (flue temp approximately 250 F.), depending on the amount of heat I need.
I was not building a deep enough bed of coal, although when I filled it to the top of the firebrick, there was a build up of ash in the center of the bed that put the fire out. I now don't fill it to the top of the firebrick. And I shake hell out of it in the morning and at night. I shake it vigorously for approximately two to three minutes in one minute increments (my arm gets tired), with fresh coal and an open ash door to allow full draft. I leave the draft door open until I see it burning hot, with a flue temp approaching 500 F.
Next year, I will burn wood in this unit in cool weather. It has a firebox of sufficient size to burn small loads of 18" logs.
Email me with any suggestions for operation.