On 2006-10-15 17:10:01 +0100, Jim D said:

On Sun, 15 Oct 2006 16:44:28 +0100, Andy Hall
wrote:


Following on from Andrew's comments, and you certainly should be able
to descale the existing heat exchanger, if a phosphate doser isn't
managing to handle the scaling then an ion exchange water softener is
the solution. A water filter won't do anything about limescale.

Of course descaling will also tell you whether this is the problem.

Thanks for the reply. It just occurred to me: scaling is only likely
to occur on the side of the heat exchanger that passes water from the
mains inlet to the sink taps, isn't it? In if that side was scaled up,
then there would be a reduction in flow from the hot taps, wouldn't
there?

Jim D

Possibly some, yes.

If the system is sludged, then a different course of action is needed -
basically clean it out and fill adding corrosion inhibitor to the
system afterwards