On Mon, 28 Mar 2011 03:54:11 -0700, Catweazel wrote:

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.

They have a 'kebab' shaped primary heat exchanger in the iJunior, iSystem
and Ri models, and a brick-like machined lump in the CDi models, but both
are aluminium - with some sort of silicon passivation to protect the
metal from corrosion.


Now with 'slightly acidic' condensate', I would've thought copper and
aluminium would not be a good electro-potential combination.

I'm not a chemist or metallurgist so I can't comment on Bosch's choice of
materials but I guess if they've invested £loadsa (and their
reputation) into the design of these things they've thought about that.


--
John Stumbles -- http://yaph.co.uk

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