Armstrong Gas Heater Model 895 L

Attractive old gas heater.

What I've been able to learn thus far is that these old beasts would sit in someone's fireplace, but most are no longer usable due to lacking proper hook-ups for one's gas system? I'd love to know if that's the case with this one, or anything about it, really. 

This is my first post on instappraisal, so I'm hoping I'm not breaching etiquettes I've yet to learn (please let me know if so). I'm looking forward to being able to help someone else out as well, with my (admittedly limited) knowledge!

Thanks for looking!