u/TheNuclearSaxophone

I know that "converting" a ventless unit to a vented one isn't possible based on answers I've seen in this sub and others. But is it possible to remove the ventless unit and install a vented one, provided all the other necessary requirements (like a vent) are also included?

I have a ventless fireplace which works a little too well; after about 5 minutes on the lowest setting the living room is roasting and it shuts off my thermostat so the rest of the house gets cool. I'd much prefer a gas fireplace that is more ambiance with some mild heating.

If it's possible to replace the unit with a ventless one, how much would that sort of replacement and fitting cost?