bleeding radiators

crispeater

when bleeding radiators from the top. do you just keep going until all the water comes out?
i started to do my front room radiator last night as it only half gets hot and loads of water came out and then i started to wonder if i was doing the right thing and stopped and screwed the wotsit back up :rolleyes:

i didnt hear any hissing ie air coming out just a long continuous sprout of water lol

djohn2002uk

If there's no hissing then there's no air.
For a radiator with air in you unscrew the valve and it will hiss. When the hissing stops, water will start comming out, first with a few bubbles as the last of the air escapes, then just water. At this point all the air is gone so you screw it back up.

Radiators not getting hot at the top show signs of air. Not getting hot at the bottom is more likely sludge especially if the cold part is higher in the centre of the radiator.

alanobrien

djohn2002uk wrote:

Not getting hot at the bottom is more likely sludge especially if the cold part is higher in the centre of the radiator.

Or in the case of new or moved (relocated/reclaimed) radiators it could be they are way out of balance. Seen that before several times.

crispeater

mine are hot at the bottom but not at the top which is what made me think air, but when i open the valve (or whatever it is) there is no air just clear water

weekendwarrior

Ensure that the heating is switched OFF when you bleed them- Bleeding a radiator


If you have a combi boiler it may need re- pressurising-

Pressurising a combi