I pose this question with a certain degree of trepidation, because I think that I know what the answer is going to be! Last Autumn, I drained down my pressurised-water system to the best of my (limited!) ability. That is, I opened both the hot and cold taps, and ran the pump until all I got out was air.
This week, having sorted out the (indirect-cooled, 20BHP Beta) new engine which should heat the water in the calorifier, I find that there is a leak in the damned thing. When the water pump is on, ie, the system is under pressure, this is a constant flow out of the calorifier (perhaps 1 pint in 2-3 minutes). When the sytstem is not under pressure (ie, water pump NOT turned on) there is a steady , and decreasing drip (maybe, 2-3 drops per minute).
Exam question. The leak appears to be around where the immersion heater joins the body of the calorifier. Does this mean that the whole thing is knackered? Given that the situation is manageable, I am loth to dismantle the galley at this stage in the season. But, should I be planning on a new Calorifier for the winter? More importantly, what must I do to avoid this happening again - the winters in Kiel are pretty frisky (-10-15!).