Choice power of Jawo electric heater (sample):

  • Length of room 5 meters
  • Width of room 3 meters

  • Height of room 2,5 meters


Calculate cubic (space) meters by multiplying the length, width and height

5 x 3 x 2,5 = 37,5 m³

Factor * for JAWO Therm heaters is 50

Multiplied by a factor* and cubic space 50 x 37,5 m³ which gives us the demand in 1875 Watt in the heat.

We select the heater (in this case) 2000 Watt. We can also choose a 800 Watt heater and another 1200 Watt or 2 heaters 1200 Watt heaters each.


Factor * : 50 for all normal spaces, 60 for rooms with increased demand for heat, such as bathrooms, children's rooms and rooms where there are older people or limited mobility