It will get very hot up there. And installing a heat shield might not
solve that problem, if it is not done properly. A lot of people install
their heats shields with one inch spacers to separate the heat shield
one inch from the ceiling. But they put metal screws straight through
the shield and through the spacers which then allows the heat to
transfer through the screws and into the boat's ceiling, therefore
defeating the purpose of the shield in the first place and causing a
fire hazard.

See your local wood stove supply and installation store for more
information on this, because you could have a fire if this is not done
correctly. If you have ever removed a heat shield from an old home,
that was put in using the method I described above, you will see the
screw holes are all black and may be even chard.

BTW, don't use a metal heat shield either. Some people will say it's OK
to do so, but metal absorbs so much heat you will defeat the purpose of
the entire installation.