Boilers - choosing the right power level

Indicative data:

-Old building without thermal insulation and with double-glazing windows- needed power  130–150 W/m2

- Old building without thermal insulation and with new windows - 100–130 W/m2

- External walls of brick with thermal insulation- 40–60 mm to 80–100 W/m2

- External walls of airbrick and with 80– 100 mm thermal insulation- 60–80 W/m2.

Parameters shown are approximate and may vary depending on the thermal insulation.