As the demolition/cleanup phase of my fireplace-to-stove-platform conversion comes to a close, I'm having serious doubts about the whole concept of using a massive brick hearth behind a freestanding stove for heat storage. Since it is all coupled into an even-more-massive outside brick wall, it looks to me that it would mostly be dumping the heat into a cold wall and dissipating there. So I wonder... wouldn't it be better to make it reflective rather than absorptive? Sure, all that metal would make the esthetics a real challenge... but it's worth considering. I'm curious what others have thought and/or done about this.