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To consider

Here are some things you should consider before installing an underfloor heating system. 

1. Explore your possibilities
To design an underfloor heating system suitable for your property, it is important to determine a few key details about your home. We are happy to assist you in any way we can.

In order to help you, we need the following information:

  • The year your property was built
  • The type of insulation in your property
  • If there is any ventilation, and if so, what type
  • The type of flooring that is to be installed
  • Your heat source
  • If any other heating systems are present

2. Install thin floors and insulate well
Try to get a floor construction that is as thin as possible. Thinner floors means a lower temperature is required to heat the floor surface. The insulation under the underfloor heating is very important to avoid the heat going down instead of up. If the heat goes down it will result in energy loss, and in the long run it cause moisture problems.

We recommend:

  • 15 mm wood over the underfloor heating system for an optimal op-eration (maximum 30 mm)
  • Good contact between the plate and the floor covering
  • Avoid using hanging plates
  • The insulation under slab-on-grade systems should be between 250 to 300 mm (min. 200 mm)

3. Adjust the distance between the pipes
Always adjust the distance between the pipes (c/c measurement) in the different parts of the property or room. With the right distance you get a more even temperature in the whole underfloor heating system, which leads to lower operational costs and better functionality. To get a more even flow temperature, the c/c-measurement can be made more narrow or wide.

The power input and flow temperature varies in different rooms. The power input for a property is based on this factors: The Insulation in the property, if a ventilation with heat recovery is installed and how big the windows are.

4. Balance the flow
When balancing the flow you make sure that the right amount of water goes to the right room. The size of the room determines the length of the underfloor heating pipe. It means that different rooms may have pipe loops with different lengths.

The water will naturally flow the shortest way, which means that the shortest loop (the closest room) will receive the most water unless the flow is balanced. To balance the flow is necessary to get a good distribution of heat in the house.

5. Set the water temperature
When the right water temperature is set, the floor will be warm all the time, just like it should be. The ideal operational temperature has been reached when the thermostats are opened and “call" for heat for long periods of time.

The thermostat keeps the property at an even temperature. A well functioning control system should be sensitive and responsive. Attaining the right temperature is fundamental for a well functioning system, and the right temperature is completely dependant on the c/c measurement, insulation and the floor construction.

Reference: Thermotech and the Swedish Energy Agency

Wooden floors over underfloor heating
The folder "Wooden floors over underfloor heating" provides you with basic information about what you should consider with regards to different types of wooden floors over underfloor heating.

You can also read about how to assess the heat guidelines and what the requirements are regarding temperature, relative humidity and moisture protection of wooden floors.

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