I have the Harman insert you see on the website.
And, though I haven't posted much in the past two weeks, if you were to look through my posts, you'll see that I LOVE this stove!
I have a 2,300sq/ft split level. Stove is downstairs and I have no registers or vents cut. This thing really cranks out heat! I'm in skivvies and a T-shirt all the time.
With the zero to sub zero temps we've been having, I'm burning three buckets (1.5 morning & 1.5 night) of nut with the draft open 3/4 to nearly one whole turn.
WOW! Don't stand near it! Outside temps are 400-430 degrees and not even the cats are curled next to it....they've retreated back a bit but still stretched out with tummies towards the box!
On days in the 20's, I can easily get 18hr burns. Now that it's cold and I'm drafted more, I give 'er a touch @ 14hrs.
The only thing is that since this isn't exposed on all sides like a stand-alone, the air jacket blower fan must be kept running. No matter to me cuz the kids own the downstairs (playroom) and my 'puter is down there. The noise WOULD irritate me if it were in the upstairs TV room.
Any questions you have about it, I'd be glad to answer!