Everything you need to know about underfloor heating
Looking for new ways to heat your home? Underfloor heating (UFH) could be the solution for you. As well as an absolute treat for you feet during the cold winter mornings, it’s a great space-saver as well as an energy-efficient way to warm up your household.
Read on for more information from which underfloor heating types are available to how to install underfloor heating.
Why choose underfloor heating?
There are plenty of benefits of underfloor heating:
There are no radiators to spoil the clean lines of a room, and space can be saved by freeing up a wall that would otherwise need to be dedicated to a radiator.
Underfloor heating is also an extremely efficient way to warm a room, and gives a more pleasant heat than radiators, stoves or traditional solid-fuel fires. Heat is emited in a very gentle way. There are no cold spots and, as most of the heat is concentrated in the lower part of the room, very little heat is wasted.
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Types of underfloor heating
Hot-water (or wet) systems
Wet systems basically use warm water from the central heating system. The water is pumped through plastic pipes that are laid on to a sub floor, before the new final surface is installed.
Underfloor heating of this type also reduces water-heating costs as it uses water at a lower temperature than standard radiators (about 40°C to 65°C to give a floor temperature of between 23°C and 32°C).
Electric mat (or wire) systems
Electric systems feature cables which are attached to open-weave mesh mats. There are, however, newer types where the elements are embedded into a continuous roll. The mats or rolls are spread out on the floor, connected together and are then linked up to the thermostat and mains power supply.
In general, whilst electric systems are cheaper to install, and cause less disruption to existing floor structure, they are more expensive to run than wet systems, which are more cost efficient.
Where to use underfloor heating
Underfloor heating is mostly used in ground-floor rooms but, in reality, there is a system to suit any type of floor construction.
Wet systems are most easily installed where it’s possible to take up floors or where new floors are being constructed, so is likely to suit new extensions, conservatories and new open-plan kitchen-cum-living areas.
Electric underfloor heating is likely to be more suitable for existing rooms as the electrical mesh system is flatter than a wet system so there is less need for floor heights to be altered to accommodate it. There are even electrical mat systems available that can be used under rugs on existing hard floors. On balance, it’s easier to add electric systems to upper-floor rooms.
How to install underfloor heating
For your underfloor heating to be most cost- and energy-efficient, your property needs to be adequately insulated. To prevent heat loss, and to ensure that the heat is directed upwards, there needs to be room for insulation to be installed beneath the system.
With wet systems, make sure you have a space for the controls to be situated (a cupboard will do). Like a radiator, each room heated with UFH has its own valve, but they can all be sited
in one spot, along with the timer controls. Most of the plastic water pipes installed in today’s systems are continuous, so there is no danger of leaks as there are no joints – and the system is generally considered to be maintenance-free.
Whilst a condensing boiler will offer the greatest potential savings on running costs, any boiler
can be used with UFH, as long as it has a sufficient capacity.
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The firm fitting the underfloor heating will plan the installation for you. If you plan to add a wet UFH system to an existing room, you will need to seek professional advice. Necessary calculations include the desired temperatures, the ceiling height, the potential heat loss and the type of flooring required.
UFH can be used with almost all types of flooring, even carpet, providing that the carpet and underlay have a thermal resistance of less than 2.5 tog. Indications show that, for the majority of carpet styles, the thermal resistance will be less than 1 tog.
Stone, ceramic, sate and terracotta
As these flooring materials have become more fashionable, there has been an increase in
the number of homes using UFH. Heat-up time depends on the thickness of the tiles. Thick flagstones will take longer to reach optimum temperature, but once this is reached there’s no difference in heat quality between thick or thinner floor surfaces.
UFH is suitable for use with many types of timber flooring, but most installers stipulate that the timber be specifically recommended for UFH use. The flooring should have a top temperature
restriction (usually 27°C) and an expansion gap needs to be left around the edges (this is easily hidden by a skirting board or trim). Always liaise with the flooring supplier and heating installer before making your purchase. Many suppliers will recommend a specific brand of electric UFH and it’s a good idea to listen to their advice.
Vinyls and laminates
UFH can be used with high-quality vinyls and laminates. However, not all laminates or vinyls are compatible with UFH, so it’s a good idea to check with the flooring manufacturer or the heating installer before committing. Many suppliers have developed their own UFH systems, or have one or two that they recommend.
Underfloor heating directory
Allbrite UK. Electric UFH for DIY installation, suitable with all types of flooring.
Cosyfloor. Cosyfloor electric cable matting systems, also Ecomat systems specifically tailored for use with laminate and wooden floors.
Devi. One of the best-known names in electrical underfloor heating, with the Devimat designed as a DIY product.
Enerfoil Magnum. Supplies three different types of electric UFH.
FloRad Heating Systems. Profoil system, which can be installed in walls as well as floors.
Invisible Heating Solutions. Suppliers and installers of both wet and electrical UFH systems.
Nu-Heat UK. Wet UFH systems with Nu-Heat’s own efficient thermal store cylinders so that the boiler isn’t necessarily needed all the time.
Wet UFH systems, which can be used to cool as well as heat a room.
Design and installation services; electric systems also supplied.
Robbens Systems. Specialist in wet systems, but can also supply electric systems.
Speed Heat. Electric UFH systems, including systems designed specifically for carpets and rugs.
Viessmann. Wet UFH systems, also solar panels, heat pumps and heat recovery systems.
Warmafloor. Supplies both wet and electric systems. Uses polybutylene (environmentally friendly and recycleable) pipes for wet systems.