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After isolating it from the hydronic loop, I flushed the hot water tank several times and ran a lot of water through it. Ordered some test kits that all showed we are clean. Now looking at a hurricane heater upgrade I was already planning and wondering if I even need to replace this hot water tank.

I haven't refilled the system since I purchased the boat, so I'm not as sure as I could be, but there is a jug of ethylene glycol antifreeze next to the expansion tank where the loop gets filled.

The only fill I've seen is via the expansion tank (silver cap on the grey cylinder on the lower left of the first picture). I haven't seen a water line interface to the hydronic loop.

I was able to isolate water heater from the coolant loop, but now I'm wondering if I need to worry about ethylene glycol contamination in the fresh water. Is there a way to easily test for that?

Woke up this morning to find coolant dripping from the ceiling, and upon investigation I discovered the hydronic heating loop overflow tank (plastic container at top of pic 1) spraying out inside the pilothouse steering station. After much cursing and rummaging for containers to collect the...