Shower Flow Drops in Unvented System

[davidg]

Hi Guys
I am new to this forum, and my knowledge is limited to what I have learned doing DIY on traditional gravity systems.

Over the summer (?) I moved into a 10 year old house that has an unvented HW system. This house has 2 showers, but there is virtually no flow from the second one, if the first is already running. In fact there is a significant pressure drop in just one if someone flushes the toilet.
Any ideas as to what I should check first?
I did get the mains pressure checked by the Water board, and they said it was about 2.2 b and met the requirements.
Thanks

David

 

[fuzzy]

i presume you have more of a problem with flow rate rather than pressure
2.2b isnt bad, ive seen better but its equivlant to 22m head, more than gravity

what size are the pipes? check the filter in the composite valve, is the a regulator on the water etc?

 

[Plumbstar Tom]

you might want to fit flow limiters on the toilet and other shower so to not starve the supply to this one

 

[REDSAW]

yes, drop the flow to the lo requirements like toilet washing machines etc then check the filters.

 

[davidg]

Thanks Fuzzy - a couple of things for me to check. Will let you know how I get on.

 

[davidg]

Thanks Tom,
There are isolating valves at the toilets so I could throttle them in slightly
Cheers
David

 

[davidg]

Thanks Redsaw,
There are isolating valves at the toilets so I could throttle them in slightly
Cheers
David