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The Natural Philosopher[_2_] The Natural Philosopher[_2_] is offline
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Default Softened water in combi boiler

Peter Parry wrote:
On Fri, 23 Sep 2011 05:21:45 -0700 (PDT), Steve Lewis
wrote:

I have now read several threads on various web sites saying that it is
ok to use salt softened water.

Which is correct?


Both. Softened water contains very small amounts of Sodium Chloride
(salt) and some boiler manufacturers were concerned about corrosion
especially with aluminium heat exchangers. Other boiler manufacturers
seem to be happy with ion exchange water softeners so the only
conclusive answer will come from the manufacturer of the boiler you
intend to fit.


It is not usual to have boiler primary circuits fed with softened water,
or indeed have any contact with fresh water..that isn't 'inhibited'.

Boilers and CH are all using closed loops these days by and large

Only the DHW tank gets 'fresh' water into it, and therefore corrosion
should be confined to that alone..and its far less a problem than scale
would be.

The point of a closed loop is that once the salts have done their bad
stuff there are no more salts..so it really shouldn't matter what you
fill a boiler primary or CH loop with.