I'm new to both wood or coal, but I'm considering the Tarm Solo 30 or the Harman SF-260, so why the switch, and why do you like the Harman better?
I'm a total newbie to all of this
, and trying to make my oil boiler with tankless coil a backup, so any information about your system would be much appreciated.
Thanks for sharing,
I had a Tarm (Scandtec) Solo Plus 40 and it was a great unit. I have tons of wood all free aside from my labor and fuel. After a motorcycle accident my wood cutting days are over so I switched to the SF-260. I spent $1300 on a 5.6 ton load of coal which sits outside my walkout basement door in my dump trailer with a coal chute. I was using about 6 full cord of wood per year with the tarm. Coal doesn't make any more mess in my basement then the wood, no bugs to worry about and it is much less work and much more stable. When I had the wood stacked outside in the same spot the mice found their way into my AC units and destroyed the wiring no mice in the coal. I regret not going with coal in the first place, the amount of time the wood takes to prepare and retrieve when needed is not worth the effort. Plus you can always supplement coal with wood in the SF260. It won't be as efficient as the tarm (which was amazing to watch when it was gasifying) but it will still cut down on the amount of coal you need.
I have my Harman hooked up to my buderus oil boiler with an indirect for hot water. I just piped the outlet on the harman into the return on the buderus and then the outlet on the buderus feeds the zones then loops back into the return on the harman with a taco 007 circulator which runs all the time circulating hot water between the boilers. So far it has been working great (after a small learning curve) and I have plenty of coal to threaten my kids with if they don't behave..."Santa is watching do you want coal in your stocking? I have plenty to give him" haha
Good luck in whatever you choose I was and am very happy with both boilers.
PS-the Tarm was $2,000 more which is almost two years worth of coal .