Wondering if anyone has any ideas. Since Christmas we've intermittently had no hot water (heating still fine, so not a boiler problem I assume). We have an unvented system, and when it goes we have no pressure in the hot water taps upstairs. It usually comes back on its own after a few days.
We had a part replaced (which I can't for the life of me remember the name of), which the 2 plumbers I've called out agree is the first place to look for the problem. I'm wondering if the pipe put of the cylinder may be blocked - we live in a very hard water area, and if it's worth having the pipes checked and the system flushed?