On 29/10/2020 23:04, GB wrote:
On 29/10/2020 22:20, Harry Bloomfield wrote:
brought next idea :
If the old one's still in circuit, there is no mystery.

If not, boiler pipes can be short circuited for pumping.

I agree, really stupid to flush after a new install - that will flush
into the new boiler.


This is a well-known firm, that says they are part-owned by WB, and they
will forward confirmation from WB that the procedure they have used is
okay. So far, they haven't.

Are they fitting a magnetic filter to keep crud out of the new
boiler ?. They should and might be relying on this to collect the
rust particles.