On Mar 26, 2:10*pm, "Triffid" wrote:
[snip] I'm really surprised - I've always regarded Vaillant is one of
the best
manufacturers. When we had a new boiler three years ago it was a toss-up
between a Vaillant and a Worcester Bosch. The installer recommended WB -
mainly because, he said, they had a first class produce and excellent
after-sales service. We took his advice and, in view of your experiences,
I'm glad we did!

I've been researching for a new boiler (waiting for the warmer weather
before purchasing/ installing)
and have come to the conclusion that WB boilers look good, however, I
was interested to note that
even WB offer a choice of Stainless steel or Aluminium heat exchangers
- with copper heating tubes.
Now with 'slightly acidic' condensate', I would've thought copper and
aluminium would not be a good electro-potential combination.
--