Underfloor Heating

Benefits of Underfloor Heating


Underfloor heating uses lower flow temperatures than traditional radiators, covering much larger surface areas and still able to heat effectively. It is around 25% more efficient than a radiator system.


Underfloor heating has no exposed hot or sharp edges providing a safe option for young children and the elderly.  It also provides a much safer environment for household pets.


UFH is an ‘invisible’ heating system as the tube is hidden beneath the floor. This frees up precious wall space, ideal for open plan living and rooms such as kitchens where space is at a premium.


The temperature will be consistent around your rooms and home, for example one corner will not be cooler than the other as is often the case with a radiator system


Perhaps one of the most popular reasons why people choose to install underfloor heating is simply because it very rarely ever requires any form of maintenance once it has been fitted.  Our pipe comes with a 50-year manufacturer warranty.


UFH is generally understood to create a healthier environment for asthma and hay fever sufferers as it removes convection currents caused by radiator heating and the dust mites and pollen they transport around the room.  There is also less danger of burns against radiators.


With the latest technology, the myth of underfloor heating taking a long time to heat a room has disappeared.  With our systems we find it takes on average around 40 minutes for the floors to heat up, and with remote app control you can turn it on around an hour before you arrive home.


Many people think of underfloor heating as being reliant upon solid surface flooring such as tile or stone.  However, this is not necessarily true, and in fact, such a heating system can now work under near enough any kind of floor – vinyl, engineered wood, carpet, laminate etc

Underfloor Heating Design

To ensure simplistic integration to the M&E system, our design team provide the following information from the outset:

  • Pipe Layout Drawing
  • Pipe Spacing
  • Heat Loss Calculation
  • Heat Output from the UFH System
  • Volume of Water
  • Total Required Flow Rate
  • Head Loss (kPa)
  • Flow Temperature Required
  • Return Temperature Required
  • Maximum Floor Temperature
  • Recommended Room Temperature
  • Floor Resistance
  • Manifold Size & Dimensions
  • Required Floor & Return Pipe Size
  • Floor Section Build Up
  • Thermostat Location
  • Wiring Diagrams

Our system is so advances it sets the new standard for premium underfloor heating performance.  At the heart of the system is a design team with the experience and software unrivaled by any company in the industry.

This combination of superior design, with our impeccable product quality, delivers unprecedented energy performance, fast heat responsiveness and exceptional levels of comfort.

Screed Floor Construction – UFH

The Staple System can be installed to insulation depts as low as 25mm thick. It is the quickest and most cost-effective form of underfloor heating within a screed.  The pipe is simply clipped to the insulation using barbed staples/clips at the required pipe spacing.  Once the system is complete, it is pressure tested with either air or water to check for any leaks – either due to damaged to the pipework, or a loose connection at the manifold.

The Clipping Rail System is typical on projects with little floor insulation. The rail is either screwed down to the insulation or stuck down using an adhesive backing strip.  Once the clip rails have been placed into position, the underfloor heating pipe is laid and clipped down in accordance with the design drawings.

The Plastic Tray System is best suited to areas where the use of Insulation isn’t possible as the tray can be fixed directly to the subfloor and can still provide a flexible and secure pipe fixing.  It can also offer some form of protection if screeding is required a while after the pipes have been installed although this is no recommended.

Installing underfloor heating within a screed, is flexible, quick and effective. The screed allows for a rapid and even radiant heat transfer into the building, providing unrivalled levels of comfort and interior design flexibility.

Project Suitability

  • Solid / Screed floor project
  • Where floor depth is not an issue
  • Over solid concrete slab
  • Over beam & block

Specification Considerations

  • Full pipe layout flexibility
  • Independent choice of insulation panels

to suit thermal and acoustic properties of the building

  • High heat output
  • Suits irregularly shaped floor areas
  • Most cost-effective system

Maximum Recommended Thermal Resistance of 0.15m2 K/W.

Suspended Floor Construction – UFH

The Aluminum Spreader Plate System is the most common when integrating underfloor heating into a suspended floor. The grooved aluminium plate spans the joist and allows the pipe to sit below the joist while being held firmly in place. The chipboard or ply flooring is then laid over the top of the joists as normal. Typically, a rockwool type insulation would be installed between the joists.

The Alu-fix System is typically used in a timber-framed construction, where the plywood has already been installed. The plate is fixed to the underside of the flooring and pipe slotted in place.

The Biscuit Screed System perfectly incorporates the thermal mass of screed with a suspended floor construction. A batten is fixed to the inside of the joist, PIR insulation is rested on the batten, to which the pipe is fixed to. Finally, a 20mm dry-mix sand and cement infill is laid over the pipe and finished flush with the top of the joist.

It is commonly mis-perceived that underfloor heating isn’t an option in suspended floors. Our R&D team have developed a range of suspended floor constructions to provide unrivalled heating perfection, within a common floor construction.

Project Suitability

  • Suspended Floor Types
  • Solid or Posi-Joist applications.
  • Renovation/ retro-fit applications.
  • Provides even heat distribution

Specification Considerations

  • Restriction of 133mm or 200mm pipe spacing.
  • High Heat Output
  • Suits irregularly shaped floor areas
  • Rapid response time
  • Even Heat distribution

Existing Floor – UFH

The Overlay Panel System.  Our 20mm Thick board incorporates a 16mm pipe with a 400micron foil to insure the maximum possible heat output, with minimal floor build-up

The Grooved Board System.  The GSB Board is designed for use with hard floor finishes such as tiles or stone, due to it high compressive strength. Board thickness of just 20mm, incorporating a 16mm Pipe.

Renovation doesn’t have to mean heating system selection restriction. With our range of over floor systems, your floor build-up can be increased by as little as 20mm, providing all the advantages of underfloor heating without architectural sacrifice.

Project Suitability

  • Existing Buildings
  • Renovation Projects
  • Areas which require a small floor build-up
  • Above acoustic layers

 Specification Considerations

  • Ultra Slim Floor Build up
  • For both new and refurbishment applications
  • Rapid Heat Response
  • Suitable over existing floors

Underfloor Heating FAQs

Is underfloor heating cheaper to run and more efficient than radiators?

Yes, underfloor heating is up to 25% cheaper to run than radiators with a condensing boiler, and up to 40% cheaper to run with a heat pump.

Is underfloor heating suitable for renovations?

Yes, we can design systems for renovations and retrofit projects.

Do I need a special boiler?

No, underfloor heating works with gas, oil and LPG boilers as well as heat pumps.

Is underfloor heating disruptive to install?

Our underfloor heating systems can be installed over any existing floor with minimal height build-up and on any floor level. Options range from installation over solid floors to solutions that can be fixed from above or below joists.

Is the make-up of my existing floor suitable for underfloor heating?

Let our design team know.  9 times out of 10 it will be suitable.

Will it work with my chosen floor covering?

Underfloor heating works with most floor coverings. Your system designer will take the floor covering into account when specifying the amount of tube needed in the floor to heat the room effectively.

What happens if there is a fault or a leak?

There are no joints in the underfloor heating tube laid in the floor and the tube we supply has a design life of over 50 years. So, unless the floor is badly damaged, it is extremely unlikely that there will ever be a leak.

Is my property suitable for underfloor heating?

All new Irish & UK properties will be suitable for underfloor heating, as they meet strict guidelines on insulation and air tightness. Older properties can have underfloor heating too, thanks to retrofit solutions that offer high heat outputs.

Does Warmth deal with the design element of underfloor heating?

Yes, Warmth offers a full UFH CAD design service including pipework layouts, heat output calculations and in some instances heat loss calculations.  All design work is carried out to the relevant standards and guidelines.

What is the best way to control underfloor heating?

Control is a key element in underfloor heating, as it can make all the difference to the efficiency of the system.  As UFH typically takes a longer time than radiators to heat up and cool down, this needs to be considered on the programming of the system.  Warmth always recommends the use of a 7-day programmable thermostat, to maximise efficiencies and configure the heating to the lifestyle of the homeowner.  There are also other upgrade options, for example smartphone control.