You would probably need a universal remote that has settings for the fireplace in its memory, which may be hard to find. If your desperate you could go through all the codes in the book to see if any will fire the right signal for the power on the fireplace. Only other option is something Z-wave which someone with more expertise may explain as my setup hasn't gotten that far yet.
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Mitsubishi WD-65733
Harmon Karmon AVR-146
DirecTV HD-H21-200
Tivo Series 2
Slingbox Solo
Klipsch Quintet III
Klipsch Sub-10
Toshiba HD-A20
Panasonic DMP-BD10A
Xbox 360 w/ HD-DVD Drive
Nintendo Wii
Sega Dreamcast (Old School)
Windows Home Server w/ 2TBs of storage
Harmony 890
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