Hi
Sorry had not seen these 2 additional replies and Seadog you are more than welcome to add questions to the thread, if anyone is saved from getting a burst pipe from information shared on here that's all to the greater good
I have thought of something else which touches on your point ,Seadog, about using the boat at least a bit over the winter, if I drain calorifier can I still run the engine or would the coil get damaged as there is no water in the calorifier fresh water space ? I'll need to run the engine to charge the batteries over the winter but then I have also read that charging the batteries by running the engine not in gear and under load is not good for the engine, although most in our marina seem to do it.
Thanks Matt