Mains water pressure

[David_m]

Hi all. I’ve just fitted a pressure gauge to my 3 bar pressure reducing valve. It is reading 2.8 bar. We are getting really poor pressure to our showers. It is an unvented system. I recently found a video showing how to put the bubble back in the tank which I did. The hot water now stops totally when using the shower then eventually starts up again at a fairly low pressure. Same when filling the bath. Does anyone have any ideas what I can do to improve the shower pressure? Thanks

 

[CBW]

Being an unvented cylinder it needs to be serviced and or worked on by qualified G3 registered engineers.

 

[tincup]

This should be tackled by someone with G3 accreditation.
Get the strainer checked by the engineer if its been doing it a while the neck of the tank could be restricted by limescale also.

 

[Madrab]

Certainly sounds like it needs some fault finding but as suggested, any work on an unvented cylinder needs a qualified engineer

 

[David_m]

Thanks for the replies. Am I correct in thinking that with 2.8 bar coming in to the house there should not be any low pressure problems with the hot water system?

 

[Madrab]

Dynamic reading needed, what does the pressure do when 2 or more outlets are open at the same time.

 

[Johntheo5]

Hi all. I’ve just fitted a pressure gauge to my 3 bar pressure reducing valve. It is reading 2.8 bar. We are getting really poor pressure to our showers. It is an unvented system. I recently found a video showing how to put the bubble back in the tank which I did. The hot water now stops totally when using the shower then eventually starts up again at a fairly low pressure. Same when filling the bath. Does anyone have any ideas what I can do to improve the shower pressure? Thanks

How old is the UV cylinder?, the baffle in some of these (Megaflo) break up and can cause all sort of problems.

Thanks for the replies. Am I correct in thinking that with 2.8 bar coming in to the house there should not be any low pressure problems with the hot water system?

As stated above, check dynamic pressure, if you cant get a flow through the hot side, open a few cold taps to check it. If the pressure is only 2.8bar dynamic and if the PRV is a good distance from the UV cylinder or the cold taps increase it to 4.0bar static (if mains pressure allows). You will/should have another PRV at the cylinder, set to 3.0bar.