Sorry, I didn't explain fully. I have a flow activated pump on the hot water feed for the shower. I guess that is enough for it to operate correctly. All of my problems have come since I had my bathroom redone. The fitters and 'Plumber' turned out to be off duty firemen, so if anything is not...
Fortunately, my kitchen mixer is less than two months old and it's one of those mix in the downspout types, if you know what I mean, so I don't think it's that.
However, my shower mixer is a thermostatic valve jobbie and when I checked the hot water side goes ice cold only a second after the...
A big thanks to seco services in particular. It never occurred to me, but it definitely looks like it's my shower mixer, 'cos with CW mains supply off, the tank doesn't fill, but it does as soon as it's back on.
Anyway at least I know where to go next.
1. Boiler is an aged Glowworm but still works great
2. Expansion tank is filling from the hot water cylinder it seems, as water is hot when heating/water is on, otherwise it still fills but cold. It then runs from the overflow outside.
3. Started earlier this week, but nothing had been done...