I second the notion, we need more info on the insulation, location, heating requirements.
Here's some myths about burning wood that I've come across. Myth: It doesn't matter what size you get you can just burn less wood. That's incorrect. You need loads with enough fuel to get the secondary burn units to 1100+ degrees, and loads tall enough to have flames shooting up there to keep them lit. My Hearthstone Clydesdale with a 2.4 cu ft firebox I've found has a 4 log split minimum. 3 splits the fire burns like crap, smokes, fills the chimney with creosote, I'm lucky if the fans go on, and afterward I sit back and wonder, what the hell was that, where was the heat!?? 4 splits there's enough fuel to warm up my unit for the secondary burn and the fuel high enough for flames to reach and sustain it, it burns better/hotter, fans kick on and I get heat for 5 hours or so which makes enough heat for the nights of Spring & Fall. So, 3 log splits are useless, burns so crappy and the secondary burn doesn't go the unit hardly warms up, but 4 lot splits will heat for 4-5 hours. My unit runs best fully loaded with 8 log splits.
That's why we need to know space, place, and insulation. My guess, the Mansfield needs 5-6 log splits as a minimum load for it to function. Probably runs best with 10-12 splits. The 5-6 log splits is a lot of heat, and may produce too much for a house that's well insulated or in a warm climate in Spring & Fall. You also don't want to be mid-winter and not filling it to the max denying it where it's probably most efficient. Going oversized is a good idea, but you don't want to grossly oversize. There's a lot of us that have an idea of what a soapstone stove will do, and can probably tell if the Mansfield is just too much stove for where you're thinking of using it.