poor flow rate for multiple showers

[markythesparky]

My sons house has three showers but none seem to be any good water pressure seems ok(2.5bar) but flow rate about 10ltr min but it drops off if a second tap is opened ,the house is 150mtr from the road so a long newish 25mm supply pipe from main supply ( which just to make it a bit more a problem united utilities dont know where its connected they gave up looking when the wanted to fit a meter so cant check if mains shut off is fully open) he has an unvented hot water system (Gledhill with pressure vessel) is there anything he can get fitted (water accumalater or something ) to ensure sufficient flow for a property of this size I realise it may be expensive but it needs something doing.property remodeled about 10 years ago most pipe work internal plastic 15 and 22mm.

 

[Riley]

I thought min was 12 lpm??

 

[markythesparky]

problem solved I have found a second mains shut off valve under the floor turned that on full and we now get just short of 4bar pressure and just under 20ltr per min flow ,not sure why there are 2 shut off valves on cold water supply

 

[Riley]

Get one removed it may improve things further. Where are you getting 4 bar as I’d be surprised if your unvented cylinder should be taking that amount of pressure

 

[markythesparky]

Get one removed it may improve things further. Where are you getting 4 bar as I’d be surprised if your unvented cylinder should be taking that amount of pressure

getting 4 bar on outside tap, tank has 3 bar regulator on it gettig just under 3 bar on hotwater at washig machine tap

 

[Welder]

I’d be tempted to open them into a bucket and see how they compare to the house. Also 25mm never big enough for three properties. If they’re not intending on using the rest then fine but just an advisory.

Also check the meter size. Most of the time the numbskulls stick a 1/2" meter on a 2" main or whatever which means you are always throttled.

 

[markythesparky]

Also check the meter size. Most of the time the numbskulls stick a 1/2" meter on a 2" main or whatever which means you are always throttled.

no meter