Any particular order I should bleed the radiators?

Heating is back on in the morning and evening here but they are in need of a bleed. I have tried to research it but some places say to start furthest from boiler and work towards it and others say to start closest to the boiler and work away from it. I have also been told that one floor at a time is the correct way. Does anyone know if there is a particular order to do this and what the correct way is if so?

Thanks

I’ve always done lowest to highest, floor by floor.

Makes sense because if you bleed the top floor first then the water just falls down into the lower radiators, meaning the air bubble goes back up to the top floor radiators you’ve just bled.

Can’t see what difference it makes how far they are from the boiler.

Do they all have air in?  That’s odd.

If they do I’d be wondering where it’s coming from.  I believe it’s quite often a gas produced by corrosion in the system… Do you have any inhibitor in there?

(I only ever get air in one or two rads upstairs so just do them in any order.)

Unless you’ve large amounts of air circulating (and I’m sure your pump would let you know if that was the case!) I don’t see what difference it would make, air’s not going to be moving from one rad to another

Happy to be corrected though, I’ve bled many a radiator but I’m no plumbing expert.

@ossify what you’ve said makes complete sense

@sharkbait no, two of them need doing from what I can tell. It was an engineer who repaired the boiler a few years back said if one needs doing then I’d need to do them all. He’s the one who said furthest to nearest too.

@johnners I’m not sure either but figured someone here would

It’s a rented house so the landlord gets the boiler serviced once a year. The service company is different to the ones who repaired it as it was an emergency job that needed doing

I only ever need to bleed one radiator, as that sometimes collects air – Easy to tell as it only get’s warm at the bottom.

If you’re renting might be worth asking the landlord to do it. Don’t want to end up knackering on old/warn/stick nipple and having to sort it all yourself?

Only saying as we’ve rented a long time and ones that the plumber struggled with due to its poor condition.

no, two of them need doing from what I can tell.

Then it really won’t matter what order.

It was an engineer who repaired the boiler a few years back said if one needs doing then I’d need to do them all.

Sounds like bollocks unless the whole system has been drained down. You can obvs do them all but if the top of the rad feels the same temp as the the bottom then there’s no air in it.

longdog speaks the truth.

IME it’s more important to turn off the heating before you start. If the pump is running then – on my ancient system at least – it sucked air in rather than pushing it out.

Don’t confuse balancing the radiators with bleeding them. Its balancing where you have to do them in a specific order.

Depends how much air there is, but of it’s a pressurised system with an expansion tank tben it’s sometimes worth working round it twice, once with the pressure set high at ~1.5bar to get most ot it out, then go round again with the pressure at 0.5. The logic being that when you pressure it the air pockets get smaller.

Makes no difference if it’s an open header tank.