I have two questions concerning central heating systems I'd like to
put to the panel. Firstly, is it possible to measure the
concentration of corrosion inhibitor currently in the system? If so,
is it a DIY job and how do I go about it? Secondly, I'm thinking of
installing a water softener which works using salt (I believe
ion-exchange is the term for such devices). Can this be used for the
cold supply to the central heating header tank or must this be
unsoftened water? Any advice would be greatly appreciated.
On 17 Nov 2003 12:46:18 -0800, email@example.com (Micheal Ra) wrote:
The answer to both is yes.
Fernox make a test kit for their products available from plumber's
merchants. Sample of the water, add reagent and look for colour
Softened water (by virtue of ion exchange) is fine for use in heating
systems. The salt is flushed through the softener during
regeneration. The only significant chemical difference vs. mains
water is that there will be a slightly higher concentration of sodium
by virtue of sodium compounds replacing those of calcium and
magnesium. I've used softened water in my system for nearly 20
years with no deleterious effect. Remember that the circuit is also
To email, substitute .nospam with .gl
I don't believe there is any problem using softened water. However, assuming
the system is working fine and not pumping over, there is no advantage to
it. There is a finite amount of scale in the water. If the water is not
being regularly replaced, the scale soon settles out and the water becomes
naturally soft anyway.
If you have a slow leak or pumping over to the extent that water leaves the
overflow, then softened water is probably quite useful.
On Tue, 18 Nov 2003 09:30:16 -0000, Christian McArdle wrote:
Any pump over will mean the header tank getting rather warm, possibly
up to the same temperature as the circulating water. This will lead to
evaporation and a rather damp roof space if the tank isn't well
covered. Then of course there is the waste of energy heating a few
gallons of water for no reason and the worse one of all introducing
oxygen into the circulating loop hastening any corrosion.
Dave. pam is missing e-mail
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