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Under floor heating

Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls

Last Post by Mars 4 years ago

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Mike Patrick

(@mike-patrick)

Reputable Member Member

Joined: 5 years ago

Posts: 193

Topic starter 13/02/2022 5:33 pm [#316]

In my continuing quest to reduce our electricity consumption I've so far mostly focused on the heat pump and its settings.

I've not looked much at the overall installation.

We have underfloor heating (ground floor and first floor). From a comfort perspective this is great as there are no hot spots or the pipework and wall space taken up with radiators.

Does anyone know what the specifications are for the spacing between the heating loops? Is it different for an ASHP installation compared with say gas. I presume it's yes as with gas heating the fluid will be circulating at a higher temperature.

I've not thought to check this before but as I have a lot of photos from when the sytem was being installed I'll be able to check whether or not it conforms.

Mike

Grant Aerona HPID10 10kWh ASHP

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

13/02/2022 6:31 pm

Posted by: @mike-patrick

In my continuing quest to reduce our electricity consumption I've so far mostly focused on the heat pump and its settings.

I've not looked much at the overall installation.

We have underfloor heating (ground floor and first floor). From a comfort perspective this is great as there are no hot spots or the pipework and wall space taken up with radiators.

Does anyone know what the specifications are for the spacing between the heating loops? Is it different for an ASHP installation compared with say gas. I presume it's yes as with gas heating the fluid will be circulating at a higher temperature.

I've not thought to check this before but as I have a lot of photos from when the sytem was being installed I'll be able to check whether or not it conforms.

Mike

Hi Mike,

From what I remember there are set spacings that are used, dependent upon the calculated heat loss for the various areas. I think the standards are 100mm, 150mm and possibly 200mm.

Just like increasing the size of a radiator will provide more heat energy, the same is true of having more UFH pipework. Obviously the more pipework the greater the cost, but it should allow the system to operate at lower water flow temperatures, which would improve the efficiency in a heat pump based system. When UFH is used with a gas boiler, the water would have to be mixed to lower its temperature for use in UFH, so having more pipework closer together would not necessarily be beneficial.

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4476

13/02/2022 10:12 pm

@mike-patrick, I don't know what the actual spacings should be in mm or cm, but the spacing will vary for an oil/gas system versus a heat pump due to the varying flow temperatures.

We have UFH that was spaced for an oil boiler and the mixer for the UFH was set to 35C. We've basically disabled that by setting it 55C – our flow is 45C. That temperature works very well with our UFH and our downstairs is always comfortably warm.

Not sure that helps you.

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