No drain valve on radiator

29 Jun 2006
Reaction score
United Kingdom
Just a quick question. I need to drain CH system to replace a radiator. However, there seems to be no drain valve.

Any tips on the best way to do it?

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Put a large roller tray under rad and open rad union nut slowly.

Be prepared to bale out the tray as it fills as there will be a few trays full.

You will also get a bit wet so have a few towels handy.

Turn off water if not a combi :D

Take the opportunity to fit a drain valve for next time ;)
some boilers have drain valves on them where you connect your F&R may be worth checking

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