Sponix wrote:

What are the advantages to protecting the whole house instead of just
the boiler? Scale build up only occurs on the hot side so is there any
point protecting the cold water circuit?

Limited in my experiance - it only has a big effect on scale
precipitated out during heating. Since it does not soften the water the
scale is still present in it and will be left on surfaces when the water
evaporates. You may find that it reduces scale a little - but you will
still get it on hard surfaces etc.

Remember however that many dishwashers etc will fill from the cold and
do their own heating - so for that reason it is probably worth treating
the whole house supply.

Obvious disadvantages are that it'll cost more and the family will be
drinking water with phosphates in it.

Things like the combimate use food grade phosphates and only add tiny
amounts... they are not that expensive to run anyway - but you may want
to avoid feeding the outside tap since that is where you may use a
significant amount of cold water.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/