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I enlarge my house 50m2. How many radiators with inertia and what power per device do you recommend?

To accurately determine an installed power, it would be necessary to know the characteristics of the extension: climatic zone, orientations, insulation, glazed surfaces, etc.
In the absence of this basic information, we can still retain a ratio of 100 watts per square meter, which in this case leads to 5000 watts installed, to be distributed (if it is a single piece) in 3 or 4 radiators, to ensure a regular comfort on the whole room. The installation must be done in compliance with the NFC 15 100 standard, ideally from a secondary distribution board.

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