Crazy high mains pressure

[MW0OMZ]

Hi to all in the forum!

I have a 6 bar pressure relief valve attached to an under sink heater and it was always dribbling a bit. Today, I finally bought a new pressure gauge and was astounded to measure the pressure at 7 bar!

I usually find most mains to be between 2-3 bar and so it seems ridiculous for it to be so high. The job is in the middle of Bath in Somerset.

What's the highest that anyone has seen?

 

[Chuck]

What's the highest that anyone has seen?

More than 10 bar is not uncommon in the UK, I've known ca 15 bar in one place. There is no specified maximum and supply companies do mess around with the pressure sometimes, although they rarely raise it. Increased pressure is worth reporting to the supply company if you want it reduced. There is a minimum spec but it's less than 1 bar (0.7 bar IIRC).

You need a G3 qualified plumber to install a pressure reduction valve to take the pressure down to 3bar and review the safety of your system, which seems a bit dodgy going by your description. Post a couple of pictures if you want more specific comments.

 

[king of pipes]

If the incoming supply is more than 4 bar then the unvented heater should have the appropriate kit fitted . Kop