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Oh.... Quantity of hot water with Δt 30°C = 13.2l/min. But, but... I had 2 showers in my old house and didn't have this problem. Seems like I need an industrial boiler to get it hot enough. Or do you always eventually need a hot tank if you want lots of hot water flow?

Sorry, back from xmas holidays, but this is more confusing (to me at least!) I added a double check valve to the hot supply before the shower, to stop anything going back that way. No change. I turned the cold isolator that feeds the shower, just a bit, to reduce the pressure. Then a bit more...

Thanks for replies all, had the family here so not done any troubleshooting for the last couple of days. I will do the tests mentioned above. It's weird because it's ONLY when the new shower is on that the problem happens, and all hot taps become lukewarm. Like the new shower itself is allowing...

Thanks, tried that but it stays hot. So presumably that one's doing what it's supposed to.

Hi all, I have just fitted a new shower room with thermostatic shower and a basin. because our water pressure is awful I also fitted a 270lt tank with pump, so there is plenty of pressure/flow. There is already one thermostatic shower in place. See diagram for pipework. The old shower works...

Turns out the ham carving knife is flexible enough. Anyhow a bit of agricultural digging with the grinder has got me in there, next time perhaps I'll try to be less clever when fitting and leave a slightly bigger hole. But then again next time I won't buy an arezzo shower that arrives already...

yeah I was just trying that, stuck on well with silicone so need a flexible blade to get behind it as the stanley can't get flush (and I don't want to scratch my marble). Will give it a try tomorrow.

hmm, looking at the picture below from a different Arezzo valve it has just suddenly occurred to me that perhaps that whole tube surrounding the shaft (below pic is a chromed one) is supposed to actually unscrew from the valve body and give me another 15mm to reach in with. And it possibly is...

Not a great photo! The front of the flats is recessed about 30mm. I did get a 12-point 21mm deep socket on there and was able to get a few turns in but then it became much harder to turn and it started to slip. Arezzo is Victorian Plumbing's own brand I think, VP are of course useless and say...

What to grip the fitting with? Seems a bit of a bodge.

Hi all, hope someone can help - I have an Arezzo shower I need to replace the thermostatic cartridge on. It's buried deep in the valve body so it needs a deep tool of some kind. What do I need for this? I've got plenty of hex end box spanners but this is square (3/4" across the flats) and they...