//Hydronic Slab Heating
Hydronic Slab Heating2018-05-25T14:46:55+00:00

Hydronic Slab Heating

Hydronic Slab heating turns your whole floor into a radiant heater producing that amazingly comfortable warm home that hydronic floor heating is known for. Hydronic slab heating is an ideal heating solution for large open living areas such as kitchens, living and dining areas as well as bathrooms that have a concrete slab beneath them.

hydronic slab heating diagram

What is Hydronic Slab Heating

Hydronic slab heating is the standard method of hydronic floor heating. It is where the pipes that carry the heated water are laid before the structural slab is poured. The pipes are laid 200mm apart in a snake like pattern to and from the manifold in 100m lengths. Each circuit covers around 20 square metres of floor space. Our multi-layered specialist pvc pipes are 16mm Uponor Pex Pipe, made in Germany and are tied directly to the reinforcement mesh (reo) and then the slab is poured directly over the top encompassing the pipe. When in operation the floor heating thermostat will call for hot water from the boiler. A hydronic heating boiler will heat the water and pump it through the pipe at 50°C transferring its heat into the concrete slab, this heat then radiates through the home similar to how a brick wall radiates heat after the sun goes down on a summers day. Therefore there is no air being pushed around which means that dust is moved around your home, and gives allergy sufferers a huge relief.

Recommended Floor Coverings

The most suitable floor finishes for in slab heating are polished concrete, engineered board or tiles. This is because they are all great conductors of the heat energy created from the hot water in the hydronic heating system. We do not recommend natural timbers or glued flooring as the heat from the heated slab can effects them.

How long does it take to heat?

It takes around 12 – 16 hours for in slab heating to warm your home. It is a set and forget system, in that it is turned on at the start of the cold season and off at the end. If you require more control and efficiency of your in floor heating then an in screed hydronic heating system is the way to go.

How is Hydronic Slab Heating Installed

diagram of hydronic slab heating measurements

In slab hydronic heating is installed within the structural slab. Like in screed heating all walls and cabinetry need to be marked out prior to installation and the concrete pour should happen the day after installation to prevent any form of damage by weather or people.

The only difference in pouring a slab with hydronic heating is that we come in when all formwork is complete and tie our pipework to the reinforcement mesh, and a second mesh should be laid on top of our pipework.


  • 16mm – Pipe Thickness
  • 30mm – Minimum thickness if slab is to be covered with a floor finish such as Tiles etc
  • 50mm– Polished Concrete – Thickness of concrete above the top of the pipework

Most jobs take around 1 day to complete, and the pour can happen the day after our installation.

Can it leak inside the concrete?

No. The pipe in the slab is encased in concrete which acts as an extremely effective protection from puncture. A 2013 study has also shown that PVC pipe is expected to last in excess of 100 years. The pipe is run in continuous circuits back to the manifold that is outside of the slab which means there are no connections within the concrete. Once the pipe is laid our technician will pressurise it to 10 bar to check for any leaks and to make a puncture during concrete pouring highly visible so that if it should be punctured it will be replaced. The operating pressure is only 1 bar, so we are testing the pipe at 10 times its running pressure.

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