No Water

That’s no water on the boat not in the canals.  Not because we have run out of water, but because I am fixing the plumbing.

We have been planning to moor in Wolverton (north Milton Keynes) for some months now so I could be close to DIY shops.  Well by close I mean a 3 mile round trip to Screwfix, 5 miles round trip to B&Q.  Still parts bought by click and collect, Cheryl’s gone home to leave me to it, and now I have started.  Its mothering Sunday so a good time for Cheryl to spend a few days with her mum, and allow me to spread bits all over the boat.

So why am I fixing the plumbing on a new boat?

We have often noticed the water coming out of our cold water tap is warm, sometimes hot enough to wash your hands under the tap.  What is worse the warm water also comes out of our drinking water tap.  I did ask my boat builder about this but was told my boat was plumbed how they always do it – so that’s it – not their fault.

After researching the issues, reading manufactures fitting instructions, thinking about it and examining the plumbing, the issue is there is no non-return valve between the hot water and cold water systems, as is recommended by the manufactures of many of the parts fitted, and other experienced boating people.  To make that problem worse, the pressurised expansion tank is on the hot side of the clarifier (hot water cylinder) so that pushes hot water into the cold water pipes.

While investigating I also found a cold water pipe that was as hot as a central heating pipe 24hrs a day.  It turns out that hot water from the top of the clarifier is self circulating though this pipe resulting in the heat lost cooling the tank.  This explains why I have noticed the boiler turning on in the middle of the night to heat hot water which it should almost never do.  This is easy to avoid with proper plumbing but now requires me to change even more of the system.

The third problem that needs fixing I did not discover until I tried to drain the system.  After 2 hrs of trying to get a tool to the drain point which was sandwiched between the 22mm heating pipes and the clarifier, I ended up having to undo another joint to drain the system.  This is particularly bizarre because if you leave a boat unoccupied in the winter it needs to be winterised, which involves completely draining all the water pipes and water tanks to ensure there is not damage from freezing, and subsequent flooding.

Hopefully I will have cold water back by tonight.  I have fitted an isolation valve between the cold water and hot water systems which will allow me to completely re-plumb the hot water side over the next few days, while still having cold water to use.