Well, have made this recommendation many times here at the forum, Two Stoves
We have three on one floor of a 2400 ft ranch style house in NW Oregon
WE have one stove that's very small (Whitfield Prodigy 2) One large Whitfield and a large Quadrafire
Running one stove hard enough to heat the entire house will result in parts of the house that's close to the stove getting too hot, and the distant rooms will be cold.
Using multiple units and not having to run them hard will give you a more even heat during the cold times, and during the milder weather one stove will suffice.
We use our little stove during moderate weather, the larger one when its colder and then two when its COLD, and possibly add the third (Quad) if needed, or allow it to come on by the stat and take up the slack.
I also believe that two are better, because when you rely on one stove, what do you do when the Snow is blowing sideways and your one stove goes KAPUTT ????
And it will not happen on a sunny day in May, ask me how I know this.
My honest suggestion is to think this over carefully and see if there is a way to install a second unit easily that will give you a good amount of synergism.
My spouse called huge amounts of smack when I set about doing three stoves, but the setup has worked marvelously over the past many years.
The family room has the one Large Whitfield, and the living room (farthest reaches of the house) has the Quad and the little Whitfield.
Yet during moderate weather, the little Whit can keep the entire house comfy.
One thing to consider is, i'ts a great idea not to have to run the stoves "Nuts to the bar" to keep the house warm.
Always go larger than you need for the total, then plan on running the stove in the lower to mid fire settings.
This keeps the thermal stresses on the unit far lower than if you have to run them hard.
The heat exchangers expand and contract a lot during duty cycles, and over time this takes a toll on them, especially if they are being subjected to a lot of heat.
We never run our stoves above the 1 or 2 setting (out of 5)
Just some thoughts.
Ms Snowy