On Tue, 18 Dec 2012 20:34:04 +0000, Stephen H wrote:


I have now got a Liffe lime beater on the incoming main water and a
Magnaclean on the boiler return pipe for the past 4 years to try and
catch the magnetite from the rads before it gets into the boiler in
order to stop a repetition of the problem.

The radiators and their associated pipework are not blocking up as
obviously all pipework to and from rads are either 22mm or 15mm.

The DHW FPHE has tiny millimetre sized channels so its not surprising
that it gets blocked up in preference to the radiators.

The problem has now reoccurred again for the 3rd time and I now have a
tenant in this house so I need to get the problem sorted once and for
all so I don't end up having to find a new tenant if the current tenant
gets fed up of the problem.

Now what I want to know is if I get a power flush engineer in, will they
be able to power flush the DHW FPHE in-situ by attaching their kit to
the combi boiler's pump? The focus I require is on finally cleaning out
the DHW FPHE as well as the rads.

Because the PHE has multiple parallel channels it's difficult to
thoroughly clean it by flushing using any technology - powerflushing
machine or mains water blasted through. Paying an engineer £150 a pop to
imperfectly flush out a PHE rather than sticking a new one doesn't seems
good value for money in the long term.


A new PHE and a decent magnetic/cyclonic filter should do the trick.


--
John Stumbles -- http://yaph.co.uk

I'm sure I've had this feeling of Deja Vu before