That avoids washing all the old crud through the new boiler.

It's a good idea to put a strainer on the return to the boiler anyway.


don't mean to hijack the thread - just a quick question:

is BES part no 7533 ok (22 mm x 22 mm compression Y in-line strainer) and
will it be ok fitted vertically below the boiler?

i know that was 2 qns - sorry!

thx
paul