You can plaster simple heaters, yes.  Plaster adds a layer of strength to the wall, yes.  

But the real magic in plaster is the way it frees your design from the constraints imposed by the brick, a rectangular building element.  

Your heater can grow from the floor like a dune, and subtle accents can be added anywhere.  Under doors, over doors, even small alcoves can be gracefully incorporated into your heater without the addition of expensive materials and intense labor time.

​