How To Install A Water Underfloor Heating System

When you’re planning an installation of a water heating system for a single room, it’s better to install electric underfloor heating. However, if it is on a bigger project, go for a water underfloor heating system.  If you’re using an electrical heating system, you will connect the power supply to the mains electricity in your house. This will take a deeper chunk in your bills. But with the water underfloor heating system, the connection is to a boiler or another heat source. Although the installation of a water underfloor heating (UFH) system is more costly compared to the electric system, you will lower the cost if you can do it yourself. Subsequently, after the installation, you’re bound to enjoy lower bills.  

Tips on How to Install Water Underfloor Heating System

Below are some tips we have to help you with a successful water underfloor heating installation:

1.     Prepare and measure

It is essential for you to make adequate preparations before embarking on the heating installation. Through your preparation, you will be able to plan and harmonize everything to ensure your work is neat. Measurement is essential as you are to consider all the fittings and fixtures during the installation. For instance, when you carry out a bathroom installation, you will fix pipe works for towel rails, toilet seats, and radiators on the floor. You must take these fixtures into account during installation to avoid damaging the heating wires. You will need to select where the manifold of the system will be housed. This will enable you to know how to run the pipework. With the use of instruction manuals and CAD drawings, your job will be less stressful.

2.     Subfloor cleaning before installation

Before the installation, endeavor to clean the subfloor. This will remove any jagged edges on the subfloor, which may cause damage to the pipes. Also, cut off any sharp juts on the subfloor. You may even sand the subfloor down if there is any need for that. For unfailing security, lay a damp-proof material on the subfloor before laying the insulation membrane from the installation kit.

3.     Note the maximum temperatures and final flooring

Consider the final flooring you intend to lay after the installation. This is because some floor types may have top temperature restrictions. Also, know the heat output of the heating system you intend to install. This will help you ascertain if your house will get the desired temperature after installation.

4.     The manifold installation

Make the installation of the manifold first securely on a wall when you’re using the water underfloor heating system. The installation is much easier when you work with your CAD drawing. Ensure that the fixing is at least 600mm above the floor to avoid bending the pipes during their fittings. Also, ensure that you install the manifold in a place where it will be easily accessible. This is to avoid any inconveniences during servicing. Turn the insulating value and connect the manifold to the mixing valve and water supply. Ensure you have a zone value where you want to run your water underfloor heating concurrently with radiators. This will provide for you separate control for the two heating systems. 

5.     Use insulation to enhance efficiency

Installing insulation boards is a sure way to get the best out of your underfloor heating system. Where there is no insulation in use, the heat may migrate upward and downward. This movement will heat the ground below the heating system and lead to energy wastage.  Insulation board such as Warmup insulation boards, will not only improve the heat out-put, they will save energy and reduce heat-up time.   

6.     Laying and Fixing of Pipe Work

After installing the manifold and the insulation, the next step is to proceed to the laying of the pipework. You’ll need to secure the pipework firmly in position when screeding. One of the popular ways to do that is with the use of grip rail. Make the grip rails to be at an angle of 90o to the piping as you lay them and use staples to put them in positions. By using a snake-like pattern, lay the piping at 200mm intervals carefully. Follow the CAD drawing to produce an efficient layout for your heating system.

7.     Connect the manifold and pipework

Use a pipe-cutter to get excellent and clean cuts on all the pipe ends. A craft knife or saw will leave a jagged-end, which may give a bad seal. You can proceed to make connections to the manifold once the piping is of desired lengths. Make a connection of the pipe to the bottom valve of the manifold using a hose pillar between them and tighten the nut. Do the same for all circuits and ensure proper connections.

8.     Laying of your flooring

After concluding the connections, proceed to lay out any flooring of your choice. This does require any technicality. You are almost done with the whole process of your work satisfactorily.


Having completed the work of installation of your water underfloor heating system, you will be eager to test the functioning and warm up your house. You should first check the flow rates. When turning on the heating system, you should do so slowly. Remember that flow rates vary for each heating system and manifold. If you are uncertain, you may refer to your instruction manual contact your electrician.


It is so fulfilling to feel the warmth right at the comfort of your home. Having completed the installation of your water underfloor heating system, you may set the correct temperature. You can now relax and enjoy the comfort of the heating system.                                                                                                                                                                                                                                  

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