Our zinc disappeared totally in a year. 7 months of that was with boat in storage in a cold climate, which I would have expected to slow corrosive reactions.
Could our boat being aluminium be a factor?
We have a normal 50/50 water / antifreeze coolant mix
There is a bronze pipe elbow on the calorifier connection at the front of the engine. I am considering changing this to a Tee, and inserting a second, much larger zinc in it. Does anbody have comments?
You need to be very careful with wiring on an aluminium boat. I assume that you have the isolated ground electrical system.
It is not unusual for a small heat exchanger zinc anode to need replacing in 5 months. Part of the problem may be because of shore power connections or electrical bleed off from the marina or boatyard.
As far as fitting a zinc into the calorifier lines wont do anything as this is the fresh water (coolant) side of things.
