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Old 23.01.2017, 20:01
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Underfloor Heating

Hi all. Need some help with my underfloor heating. My living room doesnt seem to be getting any heat. The bedrooms do get a bit of heat but not loads. I have the thermostat turned up to the max and in the picture of the pipes. The bottom set of pipes down are very warm while there is no heat in the top set

Your advice much appreciated
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Old 23.01.2017, 20:09
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Re: Underfloor Heating

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Hi all. Need some help with my underfloor heating. My living room doesnt seem to be getting any heat. The bedrooms do get a bit of heat but not loads. I have the thermostat turned up to the max and in the picture of the pipes. The bottom set of pipes down are very warm while there is no heat in the top set

Your advice much appreciated
Don't mess with anything in that cabinet.

Call.
Your.
Landlord.

Don't mess with anything in that cabinet.

(The lower pipe/manifold is the feed side of the system - it should be hot. The red and grey gubbins open and close the flow to each circuit. The top pipe/manifold is the return side of the system - it should be (roughly) the average room temperature, the black gubbins on that are the flow rate limiters.)

Did I mention that you shouldn't mess with anything in that cabinet?
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Old 23.01.2017, 20:17
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Re: Underfloor Heating

I concur, don't mess about with anything in that cabinet. The reason is that all the warm water valve operations are sensitive to all the other valve settings.

It can take several days to adjust the system.... call your landlord or owner to get some expert help. In the meantime try and decide which of the 6 areas you need the heat (bathrooms), and which areas you don't (bedrooms).
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Old 23.01.2017, 20:27
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Re: Underfloor Heating

the grey tops are thermostat controlled. i guess the red ones are just taps. try turning them to increase/decrease the flow.
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Old 23.01.2017, 20:28
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Re: Underfloor Heating

also, if you can identify which valve is responsible for the room, you can pop off the grey top and adjust the valve underneath and pop it back on.
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Old 23.01.2017, 20:39
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Re: Underfloor Heating

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also, if you can identify which valve is responsible for the room, you can pop off the grey top and adjust the valve underneath and pop it back on.
OP: If you are going to follow Phil's advice (I wouldn't), then at least record how exactly how much you have changed each.

I've been asked to help a couple of times after someone has turned everything up to 11. In once case, not long after that the boiler was repaired (because someone called the landlord, who discovered that the boiler wasn't working correctly, and had it fixed.) the person who had fiddled discovered that they had converted their entire apt into a dry sauna, with the smallest rooms significantly warmer than the larger ones.

It was a doddle to fix, it only took me about a week, and 6 visits to put the flow limiters and non tstat valves back to something near to where they were originally.

If you do choose to fiddle, then you might also consider changing your username from "kilns" to "Saunas".
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Old 23.01.2017, 20:48
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Re: Underfloor Heating

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Call.
Your.
Landlord.
I can't see anywhere in the OP's post that says they are renting and have a landlord.
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Old 23.01.2017, 20:48
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Re: Underfloor Heating

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also, if you can identify which valve is responsible for the room, you can pop off the grey top and adjust the valve underneath and pop it back on.
I agree that these grey covers should pop off. There appears to be labels for each room. There should be a directional arrow on the top of the red controls with a + and - indications. Now here is the tricky part. To adjust the controls you need to count the number of turns you have made. Take a small piece of masking tape and place this on the top of the control, say at 12 o clock, so you can keep track.

If the red dials are fully open and you still have no heat, in a maximum of 3 days or insufficient heat, then the rear controls with the black covers need investigation. Usually these are set by an expert to distribute the water in the underfloor heating hoses as needed. If someone adjusted these incorrectly, this needs to be corrected by an expert.

The room controls are meant for fine tuning. The main controls are in the box.
You have not said if you are a new tenant but if that is the case, it is possible a previous tenant turned the heat down using the red dials.

Underfloor heating takes time to react to new settings but at the very least the floor should start to feel warmer. Different floor materials react differently to underfloor heating so this is also something to consider. Laminat flooring, for example, will not feel as warm as ceramic tiles, and even with tiles there can be differences depending on the type of tiles, at least that is the case in our house.
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Old 23.01.2017, 20:55
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Re: Underfloor Heating

These valves and flow adjusters are often seen in Swiss houses. My friend lives in a block of 10 apartments running on one boiler. Right now the top floor is too cold and the bottom floors are too warm. The heating engineer made his third call today....

It cannot be stressed enough, ask your landlord to adjust the system, do not fiddle!
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Old 23.01.2017, 21:32
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Re: Underfloor Heating

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It cannot be stressed enough, ask your landlord to adjust the system, do not fiddle!
Turning the red dials is not beyond the scope of what a tenant can do. If the OP is a homeowner, they would hardly call a heating company before trying a basic adjustment. It is quite possible someone already fiddled with these and some are almost closed which may explain why the room thermostats are cranked up all the way and having no effect. It could be that turning the red dials is the fix...or not. If that doesn't work then I recommend a call to the landlord.

If the landlord arranges a service call, and the service person discovers the red dials were closed, or barely open, the tenant is going to pay for that call. It does not take an expert to make this adjustment. It really is going to be a matter of trial and error finding the balance between the room controls and the main panel controls. I would advise turning the room controls down from maximum to maybe the mid point. Then you have room to adjust them up or down.
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Old 23.01.2017, 21:43
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Re: Underfloor Heating

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Turning the red dials is not beyond the scope of what a tenant can do. If the OP is a homeowner, they would hardly call a heating company before trying a basic adjustment. It is quite possible someone already fiddled with these and some are almost closed which may explain why the room thermostats are cranked up all the way and having no effect. It could be that turning the red dials is the fix...or not. If that doesn't work then I recommend a call to the landlord.

If the landlord arranges a service call, and the service person discovers the red dials were closed, or barely open, the tenant is going to pay for that call. It does not take an expert to make this adjustment. It really is going to be a matter of trial and error finding the balance between the room controls and the panel controls. I would advise turning the room controls down from maximum to maybe the mid point. Then you have room to adjust them up or down.
If the red dials and the flow restrictors were working fine last week, or last month, then they haven't gone out of whack.

If the heating was fine last week, or last month, and now the whole apartment is cold, the there are a limited number of causes:
  • The boiler is supplying less, or cooler water (which you can't fix by messing with the room distribution).
  • The electrical thermostat has stopped working (which you can't fix by messing with the room distribution).
  • There is a sudden heat loss from the apartment (which you can't fix by messing with the room distribution).

If the OP has just moved in, then the heating may have been turned off with the red stopvalves while the apartment was left empty, and it hasn't warmed up to equilibrium yet.

If someone below or above the OP has turned their heating off, or down to a minimum, then the whole apt might be cooler than previously.

In general, the only time the distribution balance needs changing is when a single room is too hot, or too cold... unless someone has been messing with it.
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Old 23.01.2017, 21:48
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Re: Underfloor Heating

Don't see the panic, really. I usually have to fiddle with them first winter in a new flat (so far I had 3 with floor heating).
The valves are usually marked which room they are for. The main thing is - as somebody mentioned - to write down the original positions. And there is no immediate result. It could take the rest of the winter to get it all right. LOL.

If the sysem is old and there are only certain areas/corners of a room that are not heated it could also be that the tubes need rinsing. That obviously should be done by an expert.
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Old 23.01.2017, 22:15
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Re: Underfloor Heating

You all know a lot more than I, I wouldn´t even know where to find those things
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Old 23.01.2017, 22:33
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Re: Underfloor Heating

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You all know a lot more than I, I wouldn´t even know where to find those things
Behind those ugly tin doors, lower part of the wall, usually in the hallway.
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Old 23.01.2017, 22:44
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Re: Underfloor Heating

We normally have to fiddle with ours every year, too. Just do it bit by bit, though and wait for a few hours.

It's a bit trial and error and we've ended up with a sauna a couple of times until we'd got the hang of it.

I would also advocate calling the landlord (if you're renting) or a heating engineer if it's your own place. Get them to give you a quick tutorial.
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Old 23.01.2017, 22:47
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Re: Underfloor Heating

Did you check you have oil in the tank ?
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Old 24.01.2017, 16:14
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Re: Underfloor Heating

Thanks for the repsonses. I have let well alone and contacted the landlord who is sending a guy out to check it


The funny thing was only one of the pipes going to the top pipe is warm (one of the bedrooms) they are others are cold. So perhaps it is a simple solution
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Old 24.01.2017, 16:24
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Re: Underfloor Heating

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The funny thing was only one of the pipes going to the top pipe is warm (one of the bedrooms) then the others are cold. So perhaps it is a simple solution
This is exactly the problem. If too much water is allowed to flow into one area, then other areas will be colder. The system needs to be adjusted very carefully, as all the flows inter-act with each other. If the apartment is part of a block of apartments, then the overall situation with all the apartments needs to be assessed, as I mentioned, in Bern there are apartments too warm and some too cool. All this happened after the main boiler leaked and had to be replaced.
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Old 24.01.2017, 16:29
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Re: Underfloor Heating

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Thanks for the repsonses. I have let well alone and contacted the landlord who is sending a guy out to check it


The funny thing was only one of the pipes going to the top pipe is warm (one of the bedrooms) they are others are cold. So perhaps it is a simple solution
That could mean a few things:

One might be that that circuit is for some reason full open (i.e. presents zero resistance to flow), so that the majority of the water just goes through the circuit in that room.

It could also mean that that thermostat is working properly, but the others aren't.

It could also mean that that room is already warm enough that little or no heat is being transferred from the pipes to the room, so the water returns warmer than the others.
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Old 24.01.2017, 17:14
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Re: Underfloor Heating

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Thanks for the repsonses. I have let well alone and contacted the landlord who is sending a guy out to check it


The funny thing was only one of the pipes going to the top pipe is warm (one of the bedrooms) they are others are cold. So perhaps it is a simple solution
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That could mean a few things:

One might be that that circuit is for some reason full open (i.e. presents zero resistance to flow), so that the majority of the water just goes through the circuit in that room.

It could also mean that that thermostat is working properly, but the others aren't.

It could also mean that that room is already warm enough that little or no heat is being transferred from the pipes to the room, so the water returns warmer than the others.
Do you have flow meters on each circuit? That could help in diagnosing the problem.
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