Underfloor Heating – FAQs

UFH Specialists
Since 2004

Yorkshire Based
Family Firm

UFH Service

Specialist UFH
Repairs Service

Which Underfloor Heating is Best, Electric or Water?

Both underfloor heating systems achieve the same thing, 21 degrees is 21 degrees whether you use electric or water. As a rule of thumb warm water underfloor heating systems are cheaper to run over the long term, electric underfloor heating can be cheaper to install but costs more over the longer term. We generally recommend water systems wherever possible due to their more economical nature.

How Much Does Underfloor Heating Cost to Run?

Water underfloor heating systems are typically 20 percent cheaper to run than a traditional radiator system powered by a Gas boiler. Electric underfloor heating systems are cheaper to run than Oil, LPG, and Electric storage heaters for those who are not on the gas network.

What Floor Coverings Can I Have on Top of Underfloor Heating?

You can almost any type of floor covering over underfloor heating, this includes but not limited to: Amtico, Karndean, Marmoleum, Laminate, Engineered Wood, Carpet, Tiles and Stone.

What’s the Maximum Thickness of Floor Covering?

Engineered woods no more than 22mm, Stone and Ceramic tiles have a good thermal transfer and we have installed underfloor heating under 50mm flags to good effect. Carpet and underlays need to have a combined tog value of 2.5T or less (yes, carpets have tog values!)

Do I Need Floor Insulation?

Yes we strongly recommend the use of insulation otherwise you could have a heating system that is very un-economical to run. More insulation is better in this situation where floor heights permit.

What is the Cost of Installing Underfloor Heating?

This one is hard to answer in general, the cost will depend on your project and the ease of installation. Most projects can be completed in one day and others take weeks such as large commercial installations. We look at each job on its own merits and listen to your needs, we can design a system that suits your property, we do not install systems that are not suitable for you or your property.

What’s the Minimum Screed Thickness for Underfloor Heating?

By selecting the correct screed we can go low as 40mm screed. This is the minimum before the screed becomes weak, and the plus side you will save money in material cost and the underfloor heating system will heat up quicker.

How Long Before I can use my Underfloor Heating after Screeding?

It all depends on the type of screed, but some systems can be turned on as soon as 2 days after installation, others can be 7 days longer.

What’s the Drying Time for Floor Screed with Under Floor Heating?

Again this is entirely dependent on the type of screed used.

Which Areas of the UK do you cover?

We cover all of the UK, but most of our work comes from Yorkshire and Lancashire, Midlands, North East and North West.

What Happens if my Water Underfloor Heating Develops a Leak?

Assuming the leak is obvious we can easily locate the damaged section of the pipe and repair it.

Should I Leave my Underfloor Heating on all-day?

We suggest leaving the system ticking over during the day and using the set-back feature on the thermostats overnight to keep the heat in the floor and to not allow the slab to go completely cold. For example, if your day time temperature is 21 degrees Celsius, we suggest allowing the system to cool down to 16 degrees, then in the morning the heating system hasn’t got to do a lot of work to come back up to 21 degrees.

what Brand of Underfloor Heating do you Install?

We mainly supply and install Emmeti underfloor heating systems, but we have also fitted Polyplumb AKA Polypipe and JG Speedfit – we have used Nu-heat underfloor heating, Robbens underfloor heating is another one we use, also products from Underfloorheating1 at Doncaster, rehau – We prefer to useEmmeti but we are happy or quote you using your preferred system – we don’t normally supply and install products from Wickes underfloor heating or b&q underfloor heating, but screwfix do a half decent range.

How Much Screed Is Required Over Underfloor Heating?

This depends on the type of screed – but if its a flowing screed then we can go as low as 40mm – the norm is 50mm and sand & cement screeds about 65-70mm.

How much to install underfloor heating?

This questions is hard to answer – its based on each individual project, and no two jobs are ever the same, what we will do is promise to be as competitive as possible and the only way to find out the cost is to contact us using the form on the right or phone 01274 568 536

How Many KW in 200m² of Underfloor Heating?

To find out simply multiply 70w x m²

Ask an Underfloor Heating Specialist

180 thoughts on “Underfloor Heating – FAQs

  1. Hi, I want to move my underfloor heating manifold. We are renovating our kitchen and adding an extension. Where the current manifold is is in the middle of the room it comes up from the floor. I literally want to move it about 60cm – 100m straight across so it can be hidden in the island. Is this possible? How difficult would it be? Any help would be greatly appreciated.

    1. Hi – yes its possible, depends on the size of the pipe, assuming its 16x2mm then it should be a simple process of extending those pipes to reach the new manifold location, along with the flow & return from the boiler and the power supply.

  2. Hi
    I have original floor boards from when my house was built in 1851 so I assume it will not be as likely to expand, attract moisture etc as a newer floor

    Is it at all possible to install a hydronic under floor heating system – 1st floor flat (kitchen and bathroom areas to be tiled). Can only be accessed from above as tenants live down stairs.

    Do you also install wetrooms?

    Can a manifold be in a loft for heating on the floor below?

    I am based in Dewsbury

    Thanks for your assistance with this.

  3. Hi, I’ve got a room thermostat controlling a two port valve feeding a manifold ,can I remove the activator heads permanently.only two heads for a kitchen area

  4. Hi. I have single zone UFH system in my kitchen which has recently developed a problem. When the room thermostat demands heat the boiler starts and very rapidly reaches its operating temperature of 70 deg C and overswings to about 72 deg and cuts out. This doesn’t happen when the normal radiator central heating starts on it’s own, or when the UFH is turned on when the radiators are already on. It felt like a problem with the boiler in that it wasn’t able to regulate the output temperature, however, a British Gas engineer visited and said it was a problem with the UFH rather than the boiler, but they don’t deal with UFH. It’s as if the UFH return flow isn’t enough to stop the output from getting too hot – possible flow restriction??? Any advice would be appreciated – thanks!

    1. Hi – it could be one of those things you mentioned – also faulty “auto bypass valve” – thats if there is one fitted. Check you have the installed firstly, then check the blending valve on the underfloor heating by stripping it down and cleaning & lubricating.

    1. Most screeds will need a suitable coving over the top such as tiles for example, some screeds can be used as a wearing surface as long as they have been installed with that in mind from the outset.

  5. Can you tell me how water hardness might affect underfloor heating?
    We are planning to move to a new property in an area with very hard water in Wiltshire.
    I am concerned that lime-scale precipitation will fur underfloor water pipes.
    Apart from installing a water-softener, can furring be minimised by keeping the water temperature within a certain range?

    1. Hi Mike, This is difficult to answer, if the heating system has been maintained correctly with “inhibitors” then it’s likely to be ok and in good condition. It is situations where no inhibitors have been put into the system from new or repair work in the past.

      My advise would be to have the manifold inspected prior to exchange of contracts, this way then you will know what condition it is in.

      Products like https://www.sentinelprotects.com/uk/products/sentinel-x100-inhibitor and https://www.sentinelprotects.com/uk/products/x700-sanitiser-and-biocide are designed to fight against limescale.

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