which drain valve to use

[normalnorman]

Hi, I need to drain down my CH but have found 2 drain points. 1 is on the hall radiator and the other on top of the boiler in the kitchen.

I read I should use the lowest one which is in the hall, but I can't get it open with a radiator bleed key. Is there a specific tool I need or could I drain it from the one on top o the boiler?

Many thanks if you can help with this.

 

[terryplumb]

The drain cock on the boiler will drain all above it only.
The drain valve on the rad would be better. Some have a screw on top ,others a square ended shaft on top ,or beneath . Pics not clear enough to tell what type yours is. A mirror below ,and a torch should aid you to see.

 

[CBW]

Looks like a rad key type to me, try soaking some lubricant spray on it, use the rad key and gently tap with a hammer and it may turn (anti clockwise).

 

[normalnorman]

Thanks guys I took some close ups, looks a bit rounded. I'll put try some wd40 and hammer time!

 

[terryplumb]

Yes its a square head on the top. Is there a build up of crud around the square ,preventing the key from going down further ?