I'm about to change a couple of radiators, and as water bled from the
system is grey and cloudy I thought a flush would be in order. A few
years ago I removed the rads and flushed them through with a hose, but
in spite of using Fernox MB1 the system still isn't clean. I'm
inclined to blame the three ancient cast iron radiators, one of which
is about to go.
Having read the threads about commercial power flush operations I
can't justify the expense, and anyway things can't be too bad as none
of the rads have cold spots. I can't be bothered to take the rads off
again, but I intend to try Sentinel X400, filling up later using
Sentinel X100. The house is a bungalow so there isn't much head for
flushing and I wondered if I could use mains pressure. If I tee across
from the mains supplying the CH header tank into the boiler supply
pipe (would a non-return valve be sensible/ mandatory here?) via a
cut-off tap of course, and insert a cut-off tap between my tee and the
header tank, would this allow a stronger flush? Can anyone see any
flaws in this plan?
The system has 8 rads, Gloworm Space Saver, 15mm pipe.
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You can rent the powerflushing equipment. This is quite a bit less
expensive than paying the rip off merchants.
You could do this. You would also need to block off the vent pipe
over the tank or the water will come out of there. A push fit
plastic end cap would do the trick or a brass compression fitting.
Theoretically you should have a non return valve to the mains, but for
a one off exercise that you will be supervising the whole time, I see
no reason to bother. You could use a sealed system filling loop as
the means of hooking this up. That way you would have all of the
valves inclusing a non return.
To make this effective, you could also do with a valve on at least one
side of the boiler. This way you can direct the flow around the
system and through one radiator at a time by operating the radiator
valves. In that way you can flush them individually as well as the
If you do put valves around the boiler, then lever ball valves are
good, and you can the handles off to avoid inadvertently closing them.
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