Does anyone have any experience with an RSF Opel or Onyx that's been converted to gas? How well does it heat? The reason I ask is, I'm looking for a gas fireplace with... ...option to occasionally view the open hearth--that is, a door with a good gasket and sturdy handle, and can open and latch securely, hot or cold. ...openings to connect to ductwork. Opel and Onyx have this. ...efficient enough to actually send heat through the ductwork. I also welcome any other suggestions for a gas fireplace that does all those things.