Battenkiller said:The 12 cords of wood through the BK King are even more amazing since that stove is only rated at 47,000 BTU. From the BK site (sections in bold type by me):
The Facts on Btu's
There are only two rating methods that mean something to you, the consumer:
1. The first is the Btu output that is achieved during EPA testing. This testing is quite complicated and costly milled woods are burned. This is a standard for all manufacturer testing and is not intended to provide consumers with a model for how a stove will burn in their home.
2. The second method is what Blaze King refers to as the "Real World" method.
These Btu's are achieved during in house testing using the same thing a consumer burns, split, dry cordwood. In our tests, we use fir. The "Real World" Btu's listed are what the average consumer can expect to achieve, with slight variations depending upon geographical location, type of wood, elevation and amount of fuel added. Higher Btu's are possible. If you were to stand in front of your stove and frequently add fuel, burn the unit on high and have optimal conditions, the PE1006 could produce as high as 87,850 Btu's and the KE1107 could exceed 90,000 Btu's!
However, maximum Btu's would only be achievable at a certain "peak" during the burn.
Blaze King does not wish to mislead you, so we give you all the facts.
So, yes.... these stoves will put out mega amounts of heat, but only for short periods of time. Each addition of wood will drop stove temps a bit for at least a little while, (unless you are standing there feeding small pieces every few minutes like a pellet stove), and overnight burns will not be maintained at near peak at all.
This is my first year with the King. The 12 cord went through the old stove before I replaced a 50 ft wall of 50's era rotten 6' high panels of single pane glass. Something on the order of 300 sq ft fully exposed on a windy ridge. That stove got stuffed as soon as there was room in it. Replacing that wall of glass and insulating with foam/fiberglass cut our consumption by about a third while keeping the house substantially warmer.
The jury is out on if we will use any less wood with the King. I doubt it is substantially more efficient than the last stove, just has a much bigger firebox. Right now, it is 2F and blowing pretty good. I put a full load, 24x15x18, of well seasoned locust and hard maple in before I left this morning and left it about as high as I run it with the blowers on. Stopped home for lunch and it looks like it will burn for 8 hours before I can reload if I open up the air for the rest of the burn. That rate is a cord every 3 weeks or somewhere around 50K per hour on average. Granted, it would take some work and planning to keep up that rate, but cold is a good motivator.