"Mark Caszo" wrote in message
om...
I have been having problems with a few radiators in the house, which
do not warm up at all, when the heating is switched on. Having read
about all the symptoms of sludge build up, it looks like power
flushing is the way to go, to rid the system of it.

I am intending to try it myself, so any help on it will be
appreciated. I need to clarify a few points about the process;

1. I have a Potterton Puma combi-boiler. Do I need to check the type
of Inhibitor I need to use, before I put it into the system?
2. Do I need to connect the power flush kit, across each radiator and
repeat the process for all of them?
3. I have read conflicting theories about the sequence of events for
power flushing the system, i.e., drain the system first, refill, add
inhibitor .....etc. Can someone please tell me the sequence in which I
need to carry out the whole process?

I figured I needed to do this myself........as BG quoted me £800 to do
the whole house, which I thought was bit off a rip off, considering
that you could hire the equipment from HSS for £75.00 for a weekend +
£20.00 for the chemicals.

Any help on this will be appreciated.

I would strongly advise eliminating other possible causes for your problem
before going to the trouble - and expense - of flushing.

The failure of one or two radiators to get hot could be due to air locks
and/or lack of balancing in the system.

Try getting some flow to each of the cold radiators in turn by turning all
the other radiators off and - possibly - turning the pump up to a higher
speed. This will hopefully get rid of any air locks in the affected
circuits - moving any trapped air to where it can be bled out. If this
*doesn't* work, then you *may* have a blockage.

Assuming that the radiators *do* get hot by this method, but still don't get
hot enough when you turn the others back on, you will need to do some
balancing. There is a scientific way to do this - which I believe is
explained in the FAQ - but the quick and dirty way is to go round the system
a few times progressively turning down the lockshield valves on the hottest
radiators until they all feel about the same. [You will probably need to
turn the room stat up to max while you do this to make sure that the system
doesn't shut down in the middle of the exercise].

Roger