Water pressure (Hot Water Pressure!) Combi Boiler Help!

[mwl]

Hi,

I have recently had my house re plumbed, re wired and new extension and loft conversion built. My builders did an excellent job but I am not sure how competent their plumber was. I have a large Alpha Combi boiler, which we moved to the first floor, (from the ground floor). It heats the water very well but it comes out the tap stupidly slowly and if I turn another hot water tap on one will stop! Does this mean that if the dishwasher or washing machine is on I won't be able to run a bath? Secondly could all the dust from the building work damaged the boiler and therefore cause the lack of water pressure? Or is this just what combi boilers do? Help please!

 

[gaztfa1]

my combi is NOT the same make as yours but, We do have the same problem with taps and pressure along the hot feed.
You can however turn the water pressure up (on mine anyway)
Theres a nob behind the dials panel and I turned that to get more pressure. Obviously you loose heat when you increase pressure, but for the summer months it aint a problem, And we don't see it as a problem in the winter. I'm just telling you my story and am no way suggesting that you start ripping your boiler to pieces, but If you phone a local heating engineer I can't see why they wouldn't tell you exactly where you can find the pressure tap, My local heating engineer did, over the phone and for nothing.

 

[Bahco]

Welcome to combi boilers

 

[mwl]

I measured the flow rate yesterday and I get 5 litres a minute coming from the tap that is closest to the boiler! I understand Combi boilers aren't brilliant but this is ridiculous!

 

[Symo]

What's the supply pressure, pipe size etc?

 

[kevplumb]

try checking the filters /flow restrictor etc especially if its just been resited
debris in pipework perhaps