I am considering cleaning out my 8,5 year old heating system and
refilling with corrosion inhibitor.
I've had a good look around the plumming and it appears to be a closed
one, fired by a Potterton Suprima gas boiler. It is so closed that I'm
unable to locate any drain or filling valves.
I also feel the circuit pressure may be low at 1bar.
So, I would greatly appreciate if anyone had advice on draining &
filling of the system and the advised pumping pressure.
Try looking near your ground floor radiators, there should be a valve to
allow the system to be emtied, a small stubby pipe with a square head.
If not the plumber was a cowboy!
If there isn't one, removing a valve from a radiator would allow the
water to escape but I've no idea how you'd attache a pipe to drain it
cleanly into a darain.
There should be some way of draining the boiler but this will only drain
the system down to the boilers level so could leave it half full.
In such a case close both valves to the radiator and remove the rad
(catching the water in a litter tray or some such container). The connection
of a hosepipe to the valve will then be 1/2 inch or 3/4 inch BSP or 15 mm
compression depending on make of valve.
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