That looks like a really nice unit and $2300 is quite reasonable. I spent a lot of time at the boat today and it's going to be harder than I realized to run 2.5" or 3.5" air vent hose around. Unless I install the heater under the galley sink and run the hoses under the floorboards, which doesn't seem practical.
So that brought me back to thinking about mounting a small propane or diesel heater on the floor against the forward bulkhead, where there's not a lot of room, but enough. Nothing is ever easy on a boat. I'll keep looking at the Webasto and if I can make it work that would be ideal.
Thanks again,
Max