My Brittony "Combi 80" combination boiler's secondary heat exchanger
seems slightly blocked (presumably with calcium and iron oxide). So I
want to remove it and try descaling it. What is a good chemical to
use, that's easy to obtain? And can anyone offer any other tips on
unblocking these things successfully?
On Mon, 20 Sep 2004 11:09:11 +0100, "Christian McArdle"
Are you serious? I can imagine that dissolving the limescale but what
about the iron oxide? Someone suggested using a central heating system
flushing liquid. If that's a better idea, can anyone recommend a
good-value one that's easily available?
Personally, I wouldn't use anything that isn't suitable for potable water
applications on the DHW side. Iron oxide can usually be flushed out with
clean high pressure water, if you've got access to the component.
However, a properly maintained system shouldn't have any, whilst limescale
on the DHW side will be quite common on any system in hard water areas
unless a water softener or phosphate doser was used.
On Mon, 20 Sep 2004 16:25:47 +0100, "Christian McArdle"
Christian, Thank for the added input. If you were serious about citric
acid, does that mean that lemon juice would do the job? Would that be
better than the commercial bottled chemical you can buy for descaling
kettles etc? Any tiips on how to apply the citric acid/lemon juice or
how long to soak it or whatever?
You can use white vinegar if you're looking for something in the
supermarket, although it would take longer.
I'd say 15 minutes for citric acid or 45 minutes for vinegar, but follow the
manufacturer's recommendations if you can find them.
P.S. Kettle descaler is often (but not always) citric acid. Descalers for
non-potable applications are usually based on more poisonous acids.
email@example.com (Dave£) wrote in message
There is a machine for this. I had to have a heat exchanger descaled,
a few years back, and took it down to my local plumbers merchant who
hooked it up to device that pumped a solution through it. What the
solution was i don't know. The machine was portable and avaliable for
hire so it is possible to descale the heat exchanger in situ. Try a
few phone calls round to a couple of plumbers merchants, and or hire
shops. BTW it cost me 15 quid to have it descaled - 7 yrs ago.
If you want to run a pump through the whole central heating system you
can hire the kamco power flushing system. They also supply the
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