Thanks mate.
Yes, there's one on the transmission heat exchange, which is working overtime.
There's only one on the engine/coolant heat exchange, which is the one that's got me worried. If that anode is not under water it won't be working correctly right? Therefore while the boat is sitting idle, only the transmission heat exchange is working???
Re the S bend, that's just my musings regarding the above (i.e. if the fact the anode is not in water is a problem, how do I rectify that). If I'm wrong about the anode needing to be wet, and it will work perfectly fine after the raw water dr