Went on one call today and had another query by Facebook about this
so I though why not write an article about it. Both persons were very
concerned as they saw water dripping from theirs boilers. A closer
inspection for both showed that it had nothing to do with the boiler its
self.
There are many things that can make water leak from your boiler. If
you know for sure that the water is coming from a hole in the sections
then you may have a serious problem. Usually though there is an easy fix
for that also, more on that in another article. Both boilers today were
leaking water from the relief valve.

I am assuming the hot and cold water supplies should be at similar
pressures. Is there a risk to the hot water cylinder if the cold is back
feeding to the tank--I note that those that have had a similar problem
in a gravity fed system have had header tanks overflowing! I have no way
of isolating the cold supply to the shower!

Any advice appreciated!

The plumber is coming back on Monday to look at the shower mixer.
The cold is not balanced properly rather than non return valves you need
a pressure reducing valve of the same pressure on the incoming main.
When I do unvented i always do that.

MORE NEWS