Having to bleed radiator frequently

PaulStat

PaulStat

PaulStat

Soldato
Joined
1 Mar 2003
Posts
5,508
Location
Cotham, Bristol
Hi folks,

What causes air to get into radiators? The radiator in my lounge was bled 3 weeks ago, got home from christmas yesterday and once again it was hot at the bottom cold at the top so had to be bled.

What can cause this? All the other radiators are fine.

Cheers,
Paul
 
When I had this it turned out to be a leak in the underfloor pipes, though it was happening to ALL the rads in my house, or it could be the pressure valve in your boiler...
 
Yeah I'd imagine it'd have to be a leak somewhere, if air is getting in that means surely water is getting out at some point, unless air is being pumped in by your boiler/pump dowhacky...

And sorry for thread hijack... in my kitchen I have one of those tall towel rack thinggies that is only hot in the bottom 2/3rd, but theres no air bleeding valve at the top... how do I bleed it? lol :o
 
cold Top ,Hot bottom means theres air in the radiator ( needs Bleeding )

Cold Bottom ,Hot Top means there Sludge rust crap in the bottom of the radiator (take it off and blast it out with a hose in the garden)



Check theres inhibitor in the system with stops oxidation which produces air in the system.
 
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I have to bleed our radiators every day, literally :(

I'm in a flat, and the heating is on one big 70yro loop, iirc. Being on the top floor, when I bleed the radiator, I'm effectively bleeding all the radiators in the building, and 24 hours later I need to do it again.

So darn annoying!
 
R@tman said:
cold Top ,Hot bottom means theres air in the radiator ( needs Bleeding )

Cold Bottom ,Hot Top means there Sludge rust crap in the bottom of the radiator (take it off and blast it out with a hose in the garden)



Check theres inhibitor in the system with stops oxidation which produces air in the system.
Click to expand...

deffo is inhibitor in the system, had a new boiler fitted back in september and the whole system was flushed, aswell as inhibitor added.

Like I said it only happens with ONE radiator
 
Hopping on the back of this - whats the best inhibitor to stick in a system and where do I pop it into??

Can you tell I am not a plumber? :D
 
If it is only one radiator I would expect the problem to be corrosion in the radiator, you say you had a new boiler and had the system flushed but I'm assuming you stuck with the old radiators? Inhibitor is only what it says ie and inhibitor it can't totally prevent corrosion I would suspect this radiator is to far gone and needs replacing. Personally I'd never have a new boiler without replacing all the rads as they are so cheap these days.
 
2blue4u said:
are you sure? how odd! Did you buy cheap ;)

black and decker, tbs.
Click to expand...
Well I think it doesn't have a valve, this is a pic:

sdchna.jpg


Though upon closer inspection it has one of these :D :

69nskk.jpg
 
When I had our system serviced by BG couple of weeks back, I mentioned it as one of ours is the same. They said a flush would sort it. I have to bleed one of our living room rads once/twice a week.
 
Heofz

Whoever (cowboy) fitted your towel rail didnt fit the bleed valve. Instead a 3/4 iron plug has been used to fill the hole and not very successfully looking at the staining! Venting that is going to be fun, really it needs to be sorted with the proper valve.

If you have the correct dosage of inhibitor, then that will stop corrosion in the system. What it wont cure is scale/sludge/debris that is already in the system!

There would have to some sort of mad oxidising going off in a radiator to fill it full of air in a short space of time......so quite unlikely.

Virtually all systems to some degree create air. Ever watched a pan start to boil? H2O etc.....If a system is designed perfectly then this air is either taken out by an auto air vent, or is vented out thru the vent pipe.

For all other normal systems you maybe looking at venting a rad every couple of months..

If you are venting a rad excesively then nine times out of ten there is a plumbing/heating system fault.

Mick
 
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