When I bought the boat almost a year ago, the PO said the hot water tank only got lukewarm while motoring. Well, I started a winter project on the boat that sent me down a path to clean the cooling system and replace the hoses. The hot water heater's rear heat exchanger was fed off the thermostat bypass circuit. The supply to the heat exchanger in the hot water tank was fed by the bypass outlet on the cooling water pump, and the return line returned to the thermostat housing. Is this how this is supposed to be plumbed? It was done with a 3/8" fuel line that was later coupled with a 5/8" exhaust hose.
I also found that the supply line was completely clogged with brown sludge, and when I disconnected it from the hot water tank, the inlet side was completely clogged with plastic bits and heavy calcification/corrosion. I attempted to clear it out, but it seemed to go beyond the inlet nipple into the heat exchanger. When I disconnected the outlet side, it was bone dry.
I also found that the supply line was completely clogged with brown sludge, and when I disconnected it from the hot water tank, the inlet side was completely clogged with plastic bits and heavy calcification/corrosion. I attempted to clear it out, but it seemed to go beyond the inlet nipple into the heat exchanger. When I disconnected the outlet side, it was bone dry.
