Running 200f and having the pressure relief dripping is worisome, the
relief valve could be bad giving higher pressures than the unit was
designed for. I would first lower the temp to 140 till you have it
figured out, it isnt cold out yet.. Look for air bleeders on radiators
after you are sure it has enough water, bleeding while it is running
under pressure. He needs a pro to go over the system, there could be
alot of issues. You may be handy and get it working but are taking on
liability working on something you don`t know.