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Slab hydronic underfloor heating is a highly efficient, radiant heating system and the ideal choice in open plan modern homes as an alternative to traditional and less efficient heating systems. Used for both residential and commercial properties, installed in new builds or retrofitting old buildings, providing a new slab is being poured.

Hydronic slab underfloor heating is ideal for large areas, 80m2+, where the slab is used as heat storage, creating thermal mass. The slab can heat during off peak times then slowly release the heat during peak periods, making in slab heating ideal when all day heating is required. Not ideal for holiday homes or small rooms as in slab heating can take 24-48 hours for the slab to heat up, depending on slab thickness and insulation.

Any type of floor covering can be installed on top of slab underfloor heating providing you do not penetrate the slab. Polished concrete floors are a popular floor finish to install with in slab underfloor heating as exposed concrete can be cold and hard underfoot.

Create thermal mass in the slab that radiates all day long


Hydronic underfloor heating pipe is attached to either mesh or reinforcing rods before the slab is poured. These pipes flow to one or multiple hydronic manifolds which are plumbed back to the heat source being a natural gas boiler or hydronic heat pump.

It is always advised to insulate under and around the slab to avoid heat loss and boost efficiency.

Comfort Heat must be advised of any expansion joints in the slab as pipes can pass over an expansion joint but with the correct installation method.

Slab hydronic heating requires 30mm coverage above the pipe to ensure the structural integrity of the finished slab. (this is therefore 50mm from the top reinforcing mesh to the finished surface of the slab)


REHAU PEX pipe is a cross-linked polyethylene pipe with an oxygen barrier to prevent corrosion and specially designed for underfloor heating systems. With in slab hydronic heating, we aim for a heat output of 100-120W/m².


Comfort Heat provides technical diagrams, electrical loads and helpful tele-support for a seamless installation. Your project manager will need to coordinate with a licenced electrician, plumber and concrete contractor to ensure all trades have the specifications they require.


  • Pipe is covered by minimum 30mm of slab
  • Insulation recommended under and around the slab
  • Slow responsive heat

big tiles on floor


Pipe Diameter 16mm
Slab Thickness Minimum 30mm coverage above the pipe
Pipe Warranty 25 years
Cool Capacity 7kW ~ 23kW
Refrigerant R32
Operating Range -10ºC ~ +50ºC

What Slab Hydronic Floor Heating Questions Customers Ask?

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To find out more about underfloor heating, view our brochures or contact us to discuss all our products and services.

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