Draining Central Heating?

[Dougie27]

Hi all, looking to replace a radiator in the bathroom. Central Heating system is open vented. The problem is I can't find a drain valve for the CH system and none of the radiators appear to have a drain/tap outlet either. Can I drain the system by closing one of the rad valves in the bathroom and opening the otherallowing the water to drain into a bucket/tray?? Do I just have to ensure the Boiler is turned off and the feed/expansion tank ball valve is secured closed?

Thanks.

 

[namsag]

Have a look around the outside of building you may have them outside sometimes civerd by a plate.

It will take ages to empty system into a bucket. Rig something up onto the valve and attach a hose but do you actually need to drain entire system to change a rad

 

[neilster]

Try looking on the manifold if you have one.. Thats where mine lived before I had my system changed.

 

[SUPERPLUMBER]

you can do as you originally suggest, by removing the rad and opening one of the trvs.
If you go down to your local diy store and buy a hose pipe fitting that screws onto your outdoor tap (female with the thread on the inside), its the same size as your trv so you can screw it on, connect a hose and drain to your hearts content.

like this

http://cgi.ebay.co.uk/3/4-Brass-Gar...elock-Fit_W0QQitemZ200292153725QQcmdZViewItem

SP

 

[Dougie27]

Thanks for the replies. Managed to drain the CH system by draining from on of the rad valves. Didn't take too long.

Cheers.