24CDi RSF slow hot water, which exchanger to clean ?.

[Cinders]

Hi all
I've got a Worcester Bosch 24 CDi RSF, which over the last 8 years the hot water has got progressively less. I know from the forum that I may need to clean an exchanger, but which one .
There is:
1. Gas to water exchanger, then
2. Water to Water exchanger.
Can anyone advise please ?
Also has anyone else done this, pitfalls, things to be aware of etc .
And who is a good place for spares (gaskets, "O" rings etc)
Many thanks
Bazzer (aka Cinders)

 

[nickso]

if the flow of water is slow you need to be looking at the cold filter or the flow restrictor first.

 

[bass]

if the flow of water is slow you need to be looking at the cold filter or the flow restrictor first.

ditto