On Sun, 12 Nov 2006 17:20:44 +0000, Pete wrote:

I have one, and I find it quite difficult to get the flow right to
give optimum amount of hot water.

Would it be worth putting an in-line valve on the cold inlet to the
boiler and then adjusting it such that I could set it to the flow
which would be optimum temperature when taps turned on full? ie it
would limit the flow to a max value which would produce hottest water.

If yes - could I adjust by trial and error or could I adjust and set
to a known litres/minute to get the optimum flow. How could I find
out what that optimum flow would be - I guess it would be part of the
spec of the boiler?


The first things to remember is that the DHW temp control on a combi is a
MAXIMUM HW temp. If you draw water faster than it can heat you simply get
more lukewarm water. If this is your case consider yourself lucky, this
situation can be fixed, the opposite problem is a PITA to overcome.

Ideally you want to set things so that turning any HW tap on gives the
right sort of response. This may mean having to restrict the flow
especially on the kitchen sink HW tap. You will probably find that the
bath needs the highest flow/lowest temp so any restriction you add must
not over do it for that tap.

--
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
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards