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Top 10 – Underfloor Heating Questions from Homeowners

  1. Which floor coverings can I have with an underfloor heating system?

Tile and stone floor coverings will give you an excellent heat transfer and a higher, more responsive output with underfloor heating. Hardwoods and engineered woods (both 18mm-22mm) are better heat conductors than soft woods. Soft woods will cause heat transfer problems with Under Floor Heating. Carpets and underlay with a low TOG rating are fine – below 1.5TOG is the British Standard. The higher the carpet TOG the higher the resistance to heat transfer which will result in a lower system output.

  1. What thermostats should I use with my Underfloor Heating system?

Without a doubt, choose thermostats that are most practical for you and your family in the long run. It’s great to have lots of control options but how many would you still be using eighteen months later? If you and your family are quite ‘techy’ then go for ‘techy’ controls, if you want simplicity just stick with nice dial or digital thermostats.

  1. Will underfloor heating work with a combi boiler?

Yes, combi boilers are fine with underfloor heating, if you have radiators working from the same boiler then you will need to add in a two-port valve. Tee off before the two-port valve for the UFH primaries and then the two systems can work independently. You should check with the boiler manufacturers regarding a bypass. This will prevent the boiler going into fault mode due to non-circulation / overheating.

  1. Will Underfloor Heating keep my room warm enough?

This is down to a number of combined considerations, floor structure, floor covering, pipe temperature, installation, control, and heat loss. A lot of literature indicates that a screed system is capable of 100w/m2, this is true if it meets certain criteria. My first car would go 100mph if it had no passengers, was traveling downhill and had a strong tail wind. Design is the key to underfloor heating. Every system type in every project will have different characteristics; Talk to your Underfloor Heating supplier regarding system design. For an overview on Tailored Heat Underfloor system ouputs take a look at this graph > Click Here

  1. What happens if the Underfloor Heating pipe leaks?

The underfloor Heating pipe is a continuous pipe connected from the flow port on the manifold to the return port, via the room. The likely hood of pipe manufactured to British Standards, or, better still, BBA standards, naturally failing is extremely remote.Repair couplings are available in the event of accidental damage. It would be a wise move to check that the pipe specified has a consequential guarantee (not a product for product guarantee). This cover will protect you should the worse happen. An insurance company will come and put everything right again – system damage, redecoration, furniture damage, carpet damage etc.

  1. Can I have underfloor heating upstairs?

Yes, you can, if you have a solid floor then it is just the same as the ground floor. If you have suspended timber joists then it is a different method. Common installation methods include overlay or countersunk methods. You can also have a mixture of underfloor heating in bathrooms, for example, and radiators in bedrooms if you so desire.

  1. What is the best type of underfloor heating pipe to use?

Arguably, multilayer pipe has a better output due to the aluminium layer’s ability to transfer heat quicker than other pipes. I am a great believer of adding up lots of small improvements to achieve better overall efficiencies so I have always favored the MLCP (Multi-Layer Composite Pipe). PEX-a pipe is slightly less efficient than the MLCP but on the plus side, it is marginally cheaper and (arguably) quicker to install.

  1. Who can install my underfloor heating?

You need to look at your schedule and look at when your trades are available. Underfloor heating is right at the point where construction trades meet plumbing trades. If you have a site team managed by the building contractor then it is likely they have a good working relationship. If you are managing different trades, it is often cheaper and more manageable to bring in a specialist screed contractor who can prepare the floors and install the underfloor heating at the same time.

  1. Will my Underfloor Heating system require much maintenance?

All working parts of a heating system require some level of maintenance. The benefit of an underfloor heating manifold is that all serviceable items are located at one point. Should your project have multiple manifolds you will have a series of these points. Items included in an annual service are system pumps, actuators/motorised valves, and the system inhibitor. Pretty much all of these are a quick check whilst your plumber carries out your annual boiler service. You should periodically make sure that the thermostats are working correctly.

  1. How does the cost compare against normal radiators?

For a project with a screed system and a total floor area of about 150m2 is roughly, where the cost of Underfloor Heating is comparable with radiators. However, there are many variables; the number of zones, heat load requirement, heat source, and installation costs etc.
Underfloor Heating costs to a suspended timber floor are higher than that of a screed system. The cost of a suspended timber floor system will include construction materials, which represents the increased costs. These materials are not required as part of a radiator system and in comparison, this type of system carries higher costs.


Tailored Heat Underfloor Heating

Tailored Heat are trade suppliers of Underfloor Heating Systems, our customers include heating contractors, house builders, and screed contractors. We also specify systems for homeowners and architects. If you have a project email the plans through to and get the right system.

Paul Mee
Tailored Heat Supplies
t; 01228 564564

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