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.