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No service valves anywhere as I've only just put it in & can see almost all the pipework now. Hate to admit defeat but will have to call a plumber soon :cry:

Right - slight progress....hot water emerges from tank in 3/4" pipe. This expands to 1" for a couple of metres under the floor when it then splits into 1/2" for the upstairs bathroom tap & 3/4" for the drop downstairs. It is then reduced to 15mm about 3m from the new shower location...

After discovering that I could only get 3 ltrs/min hot water - I've concluded there must be some restriction in the pipework somewhere. I don't know if I'm correct in saying this but I think 7 l/m should be enough for a shower? As I said in my earlier posting, I'll have to trace the route of...

Cold is definitely from tank in loft. I suppose it's a pump or bigger feed (I have to find the pipes first !!) Thanks for your help JohnD Any other suggestions welcome !!

Tried hot only/cold only - got over 7 litres/min cold and around 3 litres/min hot. Not good is it? Three elbows that I can see and logically a pipe run of around 10m. Am trying to work out the pipe installation but there seem to be pipes everywhere

Hi JohnD Cold water is fed from tank in loft. Hot (I think but not absolutely sure) is also fed from tank. H&C are both correct and control knob working ok. It does have a big head but not good flow! Will try reducing cold pressure tomorrow and will post results if you care to look again.

Moved into a new house and ripped out cheap suite in downstairs bathroom. Fitted thermostatic Triton Antares mixer shower on gravity fed system. Before plastering/tiling, I tested installation. The flow is poor and cool. The shower head is a flat 'disc' type fed by 15mm pipe. The H&C pipes are...