That's impressive. That's a lot of house for the 100 to keep up with so well. It does it really well. I am very happy with it's performance. Like I said, I think it puts more than what it is rated at. I spoke to the guys at AHS (Ben) and he said I would need the 180 for my 2500 sq ft 1st floor ranch with vaulted ceilings + 1k sq ft basement (separate from the WG) + my 1500 sq ft well insulated work shop (separate building). I told him I wanted 12 hour burn capability in Northern NJ. I would think the 180 would heat that no problem. I do not know your insulation factor, layout, baseboard or radiant, windows, etc. etc. Did you do a heat loss calculation? Here is something I would consider. A lot of the time that 180 is not going to be needing to put out all the BTUs it can put out. Again, I do not know all your particulars. But are you eventually going to install well insulated storage tanks? I would think that 1500-2000 gallons of well insulated storage would really help. AHS will say you do not need storage. They are correct. But you will be better off with it. Imagine being able to burn your Wood Gun and all your wood flat out, that is the most efficient way, and then shut it down and let it heat your demand for as long as your storage will heat it. I installed my 400 gallon tank and am very glad I did. That is all I could afford at the time. Maybe if you are not going with storage now, you could plan for that in the future. Throwing that excess heat is what has me hesitant to heat DHW with the WG in the spring/summer. I don't want to be warming an area I am also paying to try to cool in the spirit of saving money. This is true. I try to do the best I can to keep the areas seperated and keeping that heat blowing out the window in the basement when it is hot outside. How is your buffer tank setup? Are there pics on the forum somewhere? http://www.hearth.com/talk/threads/wood-gun-boiler-and-tank-pictures.74171/#post-938495 Here is a little about how it got done. http://www.hearth.com/talk/threads/moving-in-the-tank-pictures-i.74168/#post-938169 Ask questions to the guys on this forum. I will answer any I can. But there are more knowledgable people here and they can really help you to get a good set-up for your system. I am very happy with the way my system came out. I did quite a bit of research, asked questions, and then put my own experiences into the mix. All and all, spent a lot of money, but now I am saving a lot of money. And burning no oil! That's what I'm talkin about.