The only stoves I've run across are small, some had water jackets.
My fervent hope is low-pressure water in iron radiators will be satisfactory. Natural gas and a secondary combustible fuel, to avoid petroleum if possible. I've collected a couple thousand pounds of iron radiators; estimating the surface area of them in comparison to a very large local house [~10,000 sq. ft.]. They'll be on shelves above the floor, near ceiling height. My 6500 sq. ft and 16' flat ceiling need 375k. It will be drywall, with blown insulation. The joists are 8" so at least R19+, windows are glass blocks, so it's sealed decently.
I don't have cooling other than large shop fans. The loading doors are on 3 sides, summer's tolerable.