Pressure reducing valve into boiler

[jackowat]

I am trying to give the water pressure in our rain shower a bit of a boost.

I have discovered that the mains cold water feed into the boiler has a pressure reducing valve on it. This reduces the pressure from the mains input of 6 bar to around 2.5 bar.

Reading the manual for the boiler (Worcester Greenstar combi) it says the max input pressure is 10 bar.

Would there be anything wrong with cranking the pressure reducing valve up a little bit and would this improve the hot water pressure?

If the boiler can handle 10 bar, I can't why is has been reduced from 6 and whether this was in place from the old hot water system before it was replaced with a combi boiler.

I understand pressure is different from flow, but I can't see how I could increase the flow without re running the whole house in 22mm.

Thanks for any advice!

 

[Wayners]

Why do you need a pressure reducing valve?

I had one fitted because of my mixer shower but I removed it 6 years ago as I couldn't work out why it was fitted.
I think plumber fitted it as a precaution but I don't understand why

 

[jackowat]

No idea.. it was fitted before I moved into the house. From what I can see online it gives the boiler a bit of protection if there is a surge in the mains water pressure.

 

[Wayners]

Unless you require it just remove like I have

 

[JohnD]

Mains water pressure varies, it is highest late at night when reservoirs are full and usage is low. I don't know what it's like in your area, the local water Co may tell you.

IMO it is better to control the pressure at the incoming water supply. Otherwise any mixer taps or showers will have unbalanced supplies