For a large open plan contemporary space the Wanders Jules freestanding stove may be the solution. Giving an output of over 15kw this stove will certainly punch out the heat.  The solid build makes the stove an ideal room divider, with the advantage of viewing the fire from both ends of the room. Equally, the stove can be sited into a large fireplace opening, again giving you the warmth and view of the fire from both rooms.