Here''s the propane version of the Dickinson Newport TDW refers to.. relatively compact on the bulkhead, visible flame, TC protected and fully vented incl outside combustion air.
Here's another install on the larger version in our previous boat, which didn't have free bulkead space, so we build an alcove and sacrificed a small portion of a settee:
As a bit of a bonus we gained the little storage cubby behind the heater!