Several thoughts
How much flow from the exhaust. Is it “NORMAL” output?
You did not mention the actual through hull it self. Could be
partially blocked.
Take the end caps off the heat exchanger and try and clean the
tubes themselves with a small bottle brush or blow through them
with compressed air
Westerbeke has good tech support , you can email or call them
Dave S/V Sails call #12
Original Message
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