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Calculate the actual heat loss of the room

Heat loss calculation

Part of a well designed floor heating system is to know the actual heat loss from the room which should be covered. But it is often difficult to calculate and in old houses it is often difficult to find details about how the building is constructed.

If you know your present energy consumption Q [kWh] for your house and the total living area A [m2], you can estimate the room heat loss qroom [W/m2] using this simple formula: qroom =0,5•Q/A. For bathrooms and rooms on upper floors you should add 20-50%. For prior unheated rooms like basements please contact your local DEVI office.

Next step is to determine the heatable floor area Aheat. This means that the area covered by cupboards, bathtubs, lavatories, etc. has to be deducted from the total room area Aroom.

In order to ensure a quickly responding heating system, the total calculated output has to be increased by approx. 30%.

The required output can now be found:
 
qheat [W/m²] = 1.3 • qroom • Aroom/ Aheat
When you are renovating your home installing floor heating, you should consider re-insulating your subfloor.

Perhaps you have a ventilation space below, an unheated basement or a poorly insulated floor towards the ground. Compared with no insulation, the benefit of insulation is obvious. Less than 10 mm insulation in a prior un-insulated ground floor will half the heat loss downwards.

Heating for your home

DEVI is a Danish company and the world’s largest manufacturer of floor heating systems.

You can confidently install electric floor heating under all types of flooring such as wood, tiles, laminate and linoleum.

With our energy-saving heating system you get cosy comfort and quality of life in your home