I'm an Enezone guy so please forgive me if my answer is somewhat biased... i'm paid for it
The 3.4 is a heating monster and Enerzone best seller. It is the largest EPA non-Cat available on the market (3.4 cu. ft fire box). Now that I got that out of the way, if you are doing comparative shopping please look for the following:
1) Warranty: Enerzone has one of the best warranty on the market. Lifetime on glass and stainless steel tube and many other components
2) Quality of construction: uses 5/16" thick plate steel, 'C' Cast baffle - this is a ceramic composite material that can withstand heat close to 3000f, Hi Density refractory bricks - These are the heavy duty ones we use on our furnaces
3) Coverage: Rated at 100,000BTU with coverage up to 2,700 ft.
4) Value: Uses logs up to 22", the blower is included, the Ash drawer is standard, the door overlay system means that if you can easily change the look of your unit down the road, you dont have to replace the entire door. Yet the Enerzone brand typically retails below other brands.
5) Efficiency: rated at 78% with EPA emission rating of 3.8g/hr. You should comfortably get 8 to 10 hours of burn time.
5) Service: In NE Ohio you have about 5 dealers near you.
As regards putting more heat, keep in mind a pound of wood is worth about 7,200 BTU at 15% humidity. Therefore the function of 'more heat' is in great part based on how much wood you can place in a stove. The more lb the more heat. To get the most of the heat you look for a unit with high efficiency which means it will send less heat up the chimney.
I hope this helps. Please let us know how it goes.