Wood Insert for Heatilator Fireplace Help Needed

Hi everyone. First post, longtime reader.

I have a Heatilator EC36I fireplace, it's pretty small, and I am wondering if anyone would know what inserts I could fit in it, if any. Unfortunately it's connected to a 8" chimney, so most likely I need to line the chimney to 6" if I understand how all of this works correctly. I like the looks of the Jotul C350 Winterport insert and am wondering if it would fit, or what others would fit as well. Any opinions would be great.

Thank you all for your help, I really appreciate it.

Ok, this is my secondary heat source to my Wood Furnace. The fireplace is on the main level, with a high ceiling, fans help pull the heat back down. The fireplace was in place when the house was purchased. I just want to make it more efficient for those days/weeks/months when the wood furnace is too much and bakes us out of the house. I hate putting so much wood in the fireplace and having the heat go right up the chimney and not getting much for heat out of it.

Here are a couple links with information that I have found. And unfortunately, this is all I have found.

http://www.heatilatorfireplaces.com/html/ec361.html

The dimensions, etc. are in this brochure (.pdf) -

http://content.hearthnhome.com/downloads/brochures/ECSERIES.PDF

Thanks!

Thanks all for your help. I knew the fireplace was a cheap one, but that's a bummer!