Well, if you knew what you were doing when you removed it... you probably didn't damage it. Just make sure it works properly when you put it back. You might very well be able to use your RMH parts again at your new place, if you disassemble it carefully.
when trying to sell the house, probably in the sorta near future. I figured if there were to be an issue with it, we would simply remove it and put the freestanding gas heater back on that hearth. Probably a lot more complicated than it sounds, though, right?