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  #61  
Old 14.11.2016, 19:16
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Re: Cold apartment!!!

It's a house built in the 30s. I think I released the air by bleeding the radiator right above it
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Old 14.11.2016, 19:17
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Re: Cold apartment!!!

My radiators don't have any bleed valves; the landlord confirmed this and said that only the ones on the top floor do.

However, I did have air trapped in my bathroom radiator a couple of years ago (easy to check ... top of radiator was cold, bottom was warm) so grabbed a big spanner and actually started to undo the connection where the top of the radiator connects to the pipe coming out of the wall. Loads of air shot out and just when water started to come out I tightened it up again.

I had another issue where the thermostat value thing got stuck (apparently they do that if the radiator isn't used for a long time). Again, easy to check ... radiator totally cold at all times despite other radiators getting hot. Solution even easier - remove the thermostat control knob (undo one tiny screw and pull the white thing marked 1-5 or whatever towards you) and then there's a little pin visible. It should push in (and pop back out via water pressure) when pushed. Mine didn't move - was stuck in. Gentle hit with a hammer got it working. Landlord suggested turning the value from max to min every month or so to ensure it doesn't stick again.

Last edited by adrianlondon; 14.11.2016 at 19:52. Reason: I typed "grab a big spammer" - but, well, we normally just ban those.
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  #63  
Old 14.11.2016, 19:46
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Re: Cold apartment!!!

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It's a house built in the 30s. I think I released the air by bleeding the radiator right above it
As far as I know, you need to bleed each radiator separately. I'm not sure whether you can hear the air inside a radiator but the usual symptom (mentioned in the quotation below) is top-hot & bottom-cold radiator. Is this the case?
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My radiators don't have any bleed valves; the landlord confirmed this and said that only the ones on the top floor do.

However, I did have air trapped in my bathroom radiator a couple of years ago (easy to check ... top of radiator was cold, bottom was warm) so grabbed a big spammer and actually started to undo the connection where the radiator connects to the pipe coming out of the wall. Loads of air shot out and just when water started to come out I tightened it up again.

I had another issue where the thermostat value thing got stuck (apparently they do that if the radiator isn't used for a long time). Again, easy to check ... radiator totally cold at all times despite other radiators getting hot. Solution even easier - remove the thermostat control knob (undo one tiny screw and pull the white thing marked 1-5 or whatever towards you) and then there's a little pin visible. It should push in (and pop back out via water pressure) when pushed. Mine didn't move - was stuck in. Gentle hit with a hammer got it working. Landlord suggested turning the value from max to min every month or so to ensure it doesn't stick again.
Excellent DIY guide, thank you. While searching for an answer to my problem, I also saw a video on YouTube doing exactly what you describe in your last paragraph.
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  #64  
Old 14.11.2016, 20:35
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Re: Cold apartment!!!

Yes, the radiator is hot at the top and cold at the bottom. �� But I'm too chicken to try adrianlondon's diy method
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  #65  
Old 14.11.2016, 20:37
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Re: Cold apartment!!!

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Yes, the radiator is hot at the top and cold at the bottom. ��
Then it is working normally.
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Old 14.11.2016, 20:49
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Re: Cold apartment!!!

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Yes, the radiator is hot at the top and cold at the bottom. �� But I'm too chicken to try adrianlondon's diy method
My first DIY method was for radiators cold at the top, warm/hot at the bottom. The second method was for radiators all cold.

Weird that yours is hot at the top and cold at the bottom, but it could be because the pump in your apartment block is slow (and it will get hot over time), your radiator is somehow full of sludge at the bottom or you're standing upside-down and hadn't realised.

So the pipe at the top, where the thermostat is, is hot (means water is getting in) and the pipe at the bottom is cold (no water getting out)? If so, that's magic!
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Old 14.11.2016, 20:50
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Re: Cold apartment!!!

Oo my mistake. I should have written "top-cold& bottom-warm". Sorry.
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Old 14.11.2016, 21:02
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Re: Cold apartment!!!

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My first DIY method was for radiators cold at the top, warm/hot at the bottom. The second method was for radiators all cold.

Weird that yours is hot at the top and cold at the bottom, but it could be because the pump in your apartment block is slow (and it will get hot over time), your radiator is somehow full of sludge at the bottom or you're standing upside-down and hadn't realised.

So the pipe at the top, where the thermostat is, is hot (means water is getting in) and the pipe at the bottom is cold (no water getting out)? If so, that's magic!
Normally the hot water flows into the top of the rad via the thermostat and out of the bottom of the rad. As the heat in the radiator transfers to the air the water loses heat. There will always be a temperature gradient between the inlet and the outlet as long as the room temperature is below the water temperature.

If the bottom of the rad were cold because it was sludged up then the water wouldn't be able to get out of the rad, and since water isn't compressible, neither would any hot water flow into the top, which would result in the entire rad being cold.

You can normally feel a temperature gradient between the top and bottom of the radiator by touch.
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Last edited by JagWaugh; 14.11.2016 at 21:29.
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Old 14.11.2016, 21:28
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Re: Cold apartment!!!

In that case, it's all good.�� House is warm enough anyway. Except for the staircase but that is due to drafty windows. Thanks for helping me figure this out though
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Old 14.11.2016, 21:44
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Re: Cold apartment!!!

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Normally the hot water flows into the top of the rad via the thermostat and out of the bottom of the rad
Yep, which is what I said.

However, if the top is hot and the bottom cold (not warm, cold) then something is wrong. Maybe sludge blocking it so the water flows so slowly it's gotten cold by the time it gets out? Dunno. I've never known a radiator actually be hot & cold like that.

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Oo my mistake. I should have written "top-cold& bottom-warm". Sorry.
So you're no longer standing on your head, which is good. You have air in the radiator (most likely).
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Old 14.11.2016, 21:49
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Re: Cold apartment!!!

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However, if the top is hot and the bottom cold (not warm, cold) then something is wrong. Maybe sludge blocking it so the water flows so slowly it's gotten cold by the time it gets out? Dunno. I've never known a radiator actually be hot & cold like that.
If the water coming out of the rad is cold.... then that means the rad has released the heat into the room, which is kind of the point of the exercise.

Actually, without being able to quantify the temperature delta it is hard to say. I would guess something around 10 deg C would be normal, but even that would depend on the air temperature.
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Old 14.11.2016, 21:52
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Re: Cold apartment!!!

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If the water coming out of the rad is cold.... then that means the rad has released the heat into the room, which is kind of the point of the exercise.

Actually, without being able to quantify the temperature delta it is hard to say. I would guess something around 10 deg C would be normal, but even that would depend on the air temperature.
I don't know what that means
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Old 14.11.2016, 21:52
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Re: Cold apartment!!!

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If the water coming out of the rad is cold.... then that means the rad has released the heat into the room, which is kind of the point of the exercise..
If the boiler is only sending hot water to one radiator, then yes, you'd want it to enter hot and leave cold. Each time I use the word warm you change it to cold.. So I still disagree - the radiator at the bottom should be cooler than at the top (obviously) but not cold.
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Old 14.11.2016, 21:58
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Re: Cold apartment!!!

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I don't know what that means
Hmn... Think of it this way: Heat is work... it enters the radiator via the inlet pipe, but is gone by the time the water flows back out. Where do you think the heat has gone? It has gone into the air of the room.... doing the work of heating it up.


Or perhaps a bit more entertainingly:

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Old 14.11.2016, 21:58
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Re: Cold apartment!!!

In our case it's much cooler at the bottom though not ice cold. It's a big and old radiator maybe that is why it feels different from the other radiators in our house most of which the previous owner replaced with the newer flatter types.
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Old 14.11.2016, 22:05
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Re: Cold apartment!!!

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In our case it's much cooler at the bottom though not ice cold. It's a big and old radiator maybe that is why it feels different from the other radiators in our house most of which the previous owner replaced with the newer flatter types.
As long as the bottom of the radiator is warmer than the ambient air then the radiator is working.

If, otoh, the top of the radiator is warmer than the ambient air, and the bottom of the radiator is cooler than the ambient air then you've managed to break the 2nd law of thermodynamics. This isn't explicitly written in your rental contract because it is a universal law of the universe (and the multiverse, as far as we know), breaking this law would have significant consequences.
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Old 14.11.2016, 22:06
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Re: Cold apartment!!!

Hey my problem was left-hot (top+bottom) & right-cold (top+bottom)
I just wonder whether I should evolve this thread into why wallpapers, behind the radiator, are lifting off
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Old 14.11.2016, 22:17
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Re: Cold apartment!!!

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Hey my problem was left-hot (top+bottom) & right-cold (top+bottom)
I just wonder whether I should evolve this thread into why wallpapers, behind the radiator, are lifting off
I think you should start a different thread for questions about adhesives... sort of a sticky, in a sense.
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