We've been in the outdoor wood boiler business for almost 15 yrs. and the technology today is just amazing. ProFab Ind. has in their line of products some of the most efficient wood burning units ever made. This would be the "Pro Series" that has been EPA Phase II qualified. Then there's the "Empyre Elite" that is a wood gasification boiler that has also received EPA Phase II and EPA White Tag qualifications . Both of these units burn at an 85-90% efficiency rating. "That's 50% less wood!!" But if your looking to buy a standard wood boiler, we got you covered. We have the "Empyre Stainless Steel" models that can handle anything from 2000s.f. up to 8000 s.f. And also the "Cozeburn Mild Steel" that also can handle from 2000 s.f. to 8000 s.f. And as always,"THE BEST DEALS ON STOVES PERIOD!!!!