For a short period of time I was really disappointed with the leisure line stove I have.
The primary reason was that at the recommended max feeder rate of 40, the stove puts out less than 30,000 btu and probably in the low 20,000 Btus.
However after the first cold spell where my house temp went down to 54 degrees and basement temp to 40 (and this not heating the whole house)
I turned the max feeder rate up to 50.
The next cold snap the house temp only went down to 57 and the basement to 44.
Since then I have experimented with higher feeder rates.
I turned it up to 80 one day for about 4 hours.
I got much hotter bigger fire.
The ashes at this settings were still about an inch from the edge of the grate vs maybe 2-3inches at 40.
The flue temp was still only 130 degrees or so above the barometric damper but that was maybe 20 degrees higher than normal.
The air coming out of the duct into my living room was closer to hot than lukewarm as previously.
You would think that running at 80 should double the heat output of running at 40.
I think right now my break even point when the feed rate is set at 40max is average daily temp of around 10 degrees.
This will heat my house to 62 which is where I have it set.
This means the stove at that setting can handle 52 degrees of temp difference in my house - obviously every one else's will vary.
I think the worst average daily temp I'm likely to get here is 20 below.
I think we've had days where the low temp is around -30 and the high is only around -10 - that's were the 20 below comes from.
That's another 30 degrees of temp difference which in theory the stove should easily handle if the heat output is doubled at 80.
What I am curious about though is, why is the recommended feed rate only 40.
Are there any drawbacks to running at higher than forty as long as your getting a complete burn.