Most will be chip or pellet fed systems as when you get that large cord wood becomes very labor intensive & therefore not cost effective long term.
This was a consideration for an educational institution I work with, but it made the decision to use cord wood and go with the Garn WHS3200 and a Wood Gun, combined 1,500,000 btuh. As to obtaining the cord wood, labor and cost effectiveness, the institution is located in a major forested area in north central MN, and providing jobs to local loggers and keeping the money in the local economy was a big consideration. The institution is a resident facility, and employees are on site 24-7 for the most part, regular staff loads the boilers during the day time, although part-time help is hired to provide night loading of the boilers. In this case more efficient use of existing staff plus additional local jobs were important. Another factor with the part-time night staff was the benefit of added security at the institution, also important. And then, like mentioned by others, cost of equipment and additional maintenance for a bin/hopper/auger system was a factor; also supply issues of chips during periods when loggers cannot get into the woods vs a large storage area; also it gets really cold here, and freezing of chips, breakdown of equipment, etc. was a consideration; or if a pellet system, nearest supply was over 100 mi away and transportation costs were a factor.
When considering something like this, out of pocket cost is only one consideration; the local economy, local jobs and supporting local families is another consideration.
BTW, cost savings in use of wood energy vs prior use of LP have been very large -- this system is quickly paying for itself.
