Water pressure to showers and bath

[Builder2011]

Hello and thank you for reading this message.

No manuals to go with the hot water cylinder and pressure vessels, so I do not know how to increase the pressure in the system. Please see two photos.

At present, pressure ok with showers but when bath runs there is no pressure, not even to toilet cisterns on first floor. Local water company is SES which aims for a minimum of 1 bar at the entrance to the property.

Please could you tell me how this can be solved? Thank you.

 

[Deleted member 267285]

Have you checked to make sure the incoming stopcock is fully open?

 

[Builder2011]

Hello and thank you for your reply.
There are two stopcocks. Internal under the sink 95% open. But also mains stop cock by water meter. Not checked that. Will do that. Thank you.

 

[Deleted member 267285]

Hello and thank you for your reply.
There are two stopcocks. Internal under the sink 95% open. But also mains stop cock by water meter. Not checked that. Will do that. Thank you.

If it’s not that, then that’s my limit as it’s an unvented cylinder which is beyond my current scope, G3 registered engineers forté.

 

[dilalio]

Do you have an outside tap? Best to check pressure and flow at this as it is likely to not be balanced, which means it "should" be before any inlet control group for the unvented cylinder. If this performs well then you may have a problem with the valve feeding your hot and cold internally. Need to get this checked by a g3 plumber... Good opportunity to have the unvented serviced as well.