On 21/10/2012 19:15, Alibaba wrote:
Hi all,
I want to install a phosphate doser into my new central heating system (to
reduce combi-boiler maintenance costs). Can anyone recommend one that is
inexpensive, and which will probably be cheap to refill for years to come?

I had to make a similar decision recently, and in the end went for:

http://www.screwfix.com/p/1-stage-wh...n-system/20315

There is also a 15mm pipe version which would be adequate for a combi:

http://www.screwfix.com/p/polyphosph...nhibitor/68371

(not sure if there is any benefit to that one given its more expensive!)

--
Cheers,

John.

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