We recently had a British Gas service visit. The boiler is OK but he
mentioned that the system needs a power flush to remove silt. This will cost
£600, so the query is will it be more economical to buy new radiators (7)
rather than flushing the old ones? Alternatively is this a job which an
amateur (me) can do?
Allan and Sandy
Why do it at all?
If you have the same water with corrosion inhibitor going round and
round all the time - ie no leaks, then I can not see what there will be
to flush out. Do you have symptoms of blockage or sluggish flow?
What benefit has he promised you? Can it be measured?
My view on these things is 'if it aint broke don't fix it'.
There usually is *some* sludge in the bottom of radiators - although the
system has to have been seriously neglected for the sludge to be enough to
I always remove radiators when I am redecorating a room and use the
opportunity to take the rads outside and flush them through with a hose.
There is always a quantity of black gunge that comes out - and I always keep
my system charged with inhibitor.
Now that you have a combi you can easily flush (not a true power flush) the
system out yourself.
Next time you remove a radiator turn off all the other radiators then
attatch the garden hose to the valve, open the valve and the filling loop
and then open and close each radiator in turn to flush them out at mains
pressure. (or use a drain off point if you do not want to remove a rad)
Once the water is running clean throughout the system, refill and add
inhibitor. On a sealed system like yours there will never be any black
sludge again. I took a radiator off at my parents not long ago. It was 11
years old and the water in it came out looking like water from the tap.
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