On Thu, 02 Mar 2006 08:37:45 -0800, chrishob wrote:

Hi,

I have a Ravenheat Condensing combi boiler and 3 double Biasi radiators
with TRV fitted.( System Plumbed in 22mm plastic pipe)
The problem i am having is excess/loud noise in all the radiators,it is
a fast water flowing sound from within the radiators(not banging or
gurgling)

I have bled the system including the pump,i have adjusted the pump
speed to the lowest,the pressure is 1.5 bar.

The pump within the boiler is not noisy and can hardly be heard when
next to the boiler.

I understand that there will probably be some noise from the rads and
have thought of turning down the TRVS but surely i should be able
toleave the trvs on maximum,,the sound is enough to wake us when the
boiler comes on its timer early morning.!!!

Any advice would be great.

Most combis tend to have the pump set to its maximum speed setting.
This is good when the boiler is connected to a large heating requirement.

The manual may mention that you may set a lower pump setting, it may also
state that this will reduce the effective DHW flow.

HTH

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html