"Scout" wrote in message
. ..


How many here have a hot water heater that works with the engine's coolant
system as a heat source?

Ours is such a water heater, but when we bought the boat there was a small
but insideous coolant leak which could cause engine overheating if pushed a
bit. The leak was discovered to be at the engine-to-water heater hookup
fitting, so we disconnected the water heater loop entirely. Never miss it,
and your point about toxic material flowing through one's water heater is
valid, even though we never gave it a thought. Good post.

Max