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Old 13.01.2015, 20:53
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Underfloor heating - help!

Apologies in advance for this post, my OH has been trying to set up the heating in our new house and doesn't really understand it, and is relaying his questions to me, who understands it even less...

The heating program has been reset. The open-plan ground floor is heated with underfloor pipes plus one large conventional radiator, upstairs has conventional radiators. The system has an outside temperature sensor.

What's the most efficient way of setting up the program for the underfloor circuit. Do we set it up to come on with the radiators, or does it have to be treated differently?

Does anyone know what I'm talking about?
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Old 13.01.2015, 21:01
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Re: Underfloor heating - help!

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Apologies in advance for this post, my OH has been trying to set up the heating in our new house and doesn't really understand it, and is relaying his questions to me, who understands it even less...

The heating program has been reset. The open-plan ground floor is heated with underfloor pipes plus one large conventional radiator, upstairs has conventional radiators. The system has an outside temperature sensor.

What's the most efficient way of setting up the program for the underfloor circuit. Do we set it up to come on with the radiators, or does it have to be treated differently?

Does anyone know what I'm talking about?
What type of heating do you have - as in generation of heat (oil, wood, heat pump?) and do you have sole control of heating (I assume you will have, in a house)?

With an outside temperature sensor, I assume it's probably heat pump.

Last edited by TiMow; 13.01.2015 at 21:14.
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Old 13.01.2015, 21:05
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Re: Underfloor heating - help!

we have radiators and under floor heating in the house. It all works with the same heater but both have different thermostat and different pumps.

the floor warms and cools slowly and the radiators are quick because of the inertie thermique (don't know how to say that in english). Like brick warms up slowly and stays warm a long time.

So underfloor is best kept at a constant temperature as it takes a day to fully warm up. Thermostat for that one is 25 to 30 degrees and you may finetune with the taps you find on the tubes that go under the ground (hidden in a closet somewhere).

There are a lot more things you can set up on the heating system...
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Old 13.01.2015, 21:11
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Re: Underfloor heating - help!

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we have radiators and under floor heating in the house. It all works with the same heater but both have different thermostat and different pumps.

the floor warms and cools slowly and the radiators are quick because of the inertie thermique (don't know how to say that in english). Like brick warms up slowly and stays warm a long time.

So underfloor is best kept at a constant temperature as it takes a day to fully warm up. Thermostat for that one is 25 to 30 degrees and you may finetune with the taps you find on the tubes that go under the ground (hidden in a closet somewhere).

There are a lot more things you can set up on the heating system...
I wouldn't fiddle with the flow taps - these should be on full, unless there's a problem and a circuit needs to be shut off.

If it's like our underfloor system, the room thermostats should control a shut off valve, which will be by the taps, when set room temperature is reached. That should be sufficient.

By half closing the taps, you could cause a pressure differential between circuits, which in turn could create a problem.
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Old 13.01.2015, 21:57
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Re: Underfloor heating - help!

Its a gas system, and there's no room thermostat, though there are thermostats on the radiators. Apparently we can alter the temperature of the water in the boiler.
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Old 13.01.2015, 22:00
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Re: Underfloor heating - help!

There are different systems and some are set up when installed, and you are not supposed to change these settings. In addition to the main controls there are secondary controls which you can fine tune.

Maybe post some pictures of the system and controls.

Given the time of year I would have thought the heating was already turned on. Is it just not the right temperature?
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Old 13.01.2015, 22:03
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Re: Underfloor heating - help!

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Its a gas system, and there's no room thermostat, though there are thermostats on the radiators. Apparently we can alter the temperature of the water in the boiler.
Gas ..... ? Mmmm ......
I'm afraid I have .....




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Old 13.01.2015, 22:12
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Re: Underfloor heating - help!

we also have gas. works fine

the temperature of the water in the boiler should be above 60 degrees Celsius to avoid salmonella bacteria. It is for your hot water not for heating

the radiator thermostat just open completely. If it gets too warm just adjust. If installed properly there can not be thermostats on all radiators (the system would not work correctly)

Look for the manual that came with your heating system. The gas guys put it usually close to the heater. You may also google the make and find the manual online.

can you share type and or make of the heater?
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Old 13.01.2015, 22:28
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Re: Underfloor heating - help!

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Its a gas system, and there's no room thermostat, though there are thermostats on the radiators. Apparently we can alter the temperature of the water in the boiler.
I'd leave the boiler water temperature alone. The installation guy 'probably' set it up right.

I'm assuming you don't have a heat pump. (Do you know what I mean?)

If there are no room thermostats for the underfloor heating (which is what you wrote), I would guess that this is controlled by the outside thermostat. The outside temperature drops, the pump comes on and the floor heats up slowly.
This is how ours works for a few of the circuits such as the bathroom ones.


So, assuming this is working correctly, are your rooms too hot or too cold?

If they are too cold, turn the radiator thermostat up a fraction. If they are too cold, turn them down.

That's it.

The only thing you have to remember is that as the underfloor heating is slow to react, if the outside air temperature is -10'C one day and then changes to 10'C the next day (this happened a couple of weeks ago), the house could feel too warm for a few hours.

If you do need to twiddle with anything, make a note of the position of anything before you twiddle it so you can put everything back as it was and after making a change, wait a while to see if it made any difference but, as I wrote above, you should only ever need to change the room thermostats*

*And the summer/winter setting of the boiler twice a year.
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Old 13.01.2015, 22:55
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Re: Underfloor heating - help!

I knew I should have told him to post his own questions, I haven't even seen the system...

Basically it seems he just wanted to know whether the underfloor heating should be left on, or if it should go on and off with the central heating. Goodness knows why he felt the need to involve the bloody boiler in the discussion.

So, it seems like the answer is that we should leave the underfloor heating on constant during the winter?
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Old 13.01.2015, 23:09
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Re: Underfloor heating - help!

yes leave the underfloor heating on

now tell him to go to sleep
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Old 14.01.2015, 00:11
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Re: Underfloor heating - help!

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So, it seems like the answer is that we should leave the underfloor heating on constant during the winter?
Yes, it should turn itself on and off if necessary.
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Old 14.01.2015, 00:19
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Re: Underfloor heating - help!

The system will have been designed to function with both underfloor and radiators.

It will also have been designed for minimum user input ..... and interference.

It should include a user manual (check on the top of the main unit).

Change as little as possible ..... it will work, but as it's not that cold at the moment, you may think that it's not.

It could take in excess of 24 hrs. to sort out and stabilise.



Time to dig out the pullies, in the interim.
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