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Old 09.12.2020, 09:48
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Underfloor heating - strange problem

Hi all,

We have underfloor heating in our 2nd floor apartment and this year it seems to not be working as well as it was in the previous winter.

The system has apparently just been flushed and a new pump was put in downstairs. We were away during this time and when we came back, I noticed all of the valves were on 0 flow. I tried closing the "main" valve and opening again, and now there is some flow to the valves controlling each room.

Last winter, I could open up all the valves in our apartment manifold and the flow would go right to the maximum (>2.4L/min). We would feel that the floor is warm and the apartment could easily reach 24C or more. This time, the flow reaches a maximum of around 1.5L/min, all fully open, with or without the thermostats connected. Our apartment is around 21/22 C.

We had the heating guy come round this morning, he said there is no problem, the apartment should be 21/22, and everything is normal.

Maybe it's the new pump, but it seems kind of weird to me that we're not getting the flow of previous years and we can't feel that the floor, or manifold / tubes, is warm.

Has anybody had any similar experience?

Thanks

Last edited by Enohzee; 09.12.2020 at 10:30.
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Old 09.12.2020, 11:48
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Re: Underfloor heating - strange problem

You actually shouldn't really feel that the floor is warm, that's what I was told over the phone when I complained that our system wasn't working properly. However, when I explained that is actually felt cold and we only had about 17 degrees in the building, they came to have a look and did something but I don't remember what. He is right in saying that the optimal temperature is 21/22, so if you have that, there is no problem. It's better for the environment, your wooden floors (if you have them) and your skin if you add a few more clothes rather than turning up the heat.
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Old 09.12.2020, 12:49
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Re: Underfloor heating - strange problem

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You actually shouldn't really feel that the floor is warm, that's what I was told over the phone when I complained that our system wasn't working properly.
Well yes, the landlord/agency always say it isn't a problem / it's your mistake the first time you call them

In the five-year-old flat we rented the heat in the floors was slightly noticeable, even with the heating set at 21C.

In our house it is a lot more noticeable because the heating is old and not so even (modern systems use thinner and less widely spaced tubes) and the house isn't as well insulated so the floor has to be hotter to provide the same air temperature. The warmer spots are obvious underfoot, and because the cats lie on them
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Old 09.12.2020, 13:51
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Re: Underfloor heating - strange problem

Run ours at 23° and higher. With warm cat-patches when it get down around 1° outside.

Does your apartment have a small cupboard with the heating pipes and valves? It could be you have air in the system and these valves allow you your the bleed it - just like radiators.

A modern system should have self bleeding valves...
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Old 09.12.2020, 14:08
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Re: Underfloor heating - strange problem

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Run ours at 23° and higher. With warm cat-patches when it get down around 1° outside.

Does your apartment have a small cupboard with the heating pipes and valves? It could be you have air in the system and these valves allow you your the bleed it - just like radiators.

A modern system should have self bleeding valves...
We used to be able to do that, even on low, now I have them all on max and it gets to 21/22C.

We have a cupboard with the manifold, valves, etc., but I'm not sure how to bleed them. I'll see if I can figure it out. The heating guy didn't seem to see any problem or mention bleeding though...
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Old 09.12.2020, 16:00
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Re: Underfloor heating - strange problem

We have 4 zone in our flat. One we cannot control the heat, floor temperature is 28 (ceramic). One we can control, floor heat is 26(ceramic). Final two controllable are 24 (wood tile). Ambient flat temperature is at about 21 with all the controls on full.


Doesn't seem like it's well set up to me, but within comfort, and I don't have good experiences dealing with the landlord etc.


It was worst a couple years, at the start of winter, but each time they said they had to purge air out of the system and then it improved.
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Old 09.12.2020, 11:50
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Re: Underfloor heating - strange problem

Hello,

Generally, above 20°C during the day is considered OK. Old installations reduced the power during the night, so temp could drop to 15-16°C. But if you have underfloor heating it implies a recent install where the heating should be working at a constant rate to keep 20+ °C.

I assume you already have a thermometer, measure the temp in every room and compare to this guidance provided by ASLOCA https://www.asloca.ch/geneve/2017/10...e-chauffage-2/
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Old 09.12.2020, 11:54
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Re: Underfloor heating - strange problem

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Our apartment is around 21/22 C.
Or in other words: Everything is perfectly fine and working within reasonable limits.
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Old 09.12.2020, 12:08
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Re: Underfloor heating - strange problem

It is all fine, and acceptable temperature.

I was just concerned because I needed to fiddle with it initially to turn it on, and that it's different to previous years (won't go to full flow)... I guess they're running the pump at lower flow rate this year.
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Old 09.12.2020, 12:43
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Re: Underfloor heating - strange problem

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It is all fine, and acceptable temperature.

I was just concerned because I needed to fiddle with it initially to turn it on, and that it's different to previous years (won't go to full flow)... I guess they're running the pump at lower flow rate this year.
Maybe that was the point of the new system, to not have to have it running at full capacity? My heat comes from the Hagenholz rubbish incineration plant, we have a big device down in the cellar that turns whatever they send our way into cosy warmth in our apartments. And I'll admit to having the thermostat in the bathrooms set to high enough for the floor to actually feel warm: it is just that little bit of luxury when you get out of the shower. In most other rooms, the thermostat is on 2 out of 5, as the heat from the bathrooms escapes into the rest of the flat and ensures it is very comfortable.
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