We’re asked “what is the energy rating”.  Electric heaters do not have efficiency ratings in the same sense as other appliances (such as TV’s or Fridges.) If you see an electric heater or radiator advertised as A, A+, ignore it. This type of rating does not apply to electric heaters. This is because electric radiators are direct acting appliances. The electricity consumed is directly transferred into heat. By design, there is very little else for the energy to be used on. (Other than the display or lights which account for less than 1% of the consumption.) From the perspective of energy transfer, all electric heaters are around 99% efficient. Whereas with a light bulb (for example) 80% of power is used to illuminate the light and 20% is wasted as heat. For this reason A,B,C ratings don’t apply to electric radiators heaters. The only rating which applies erplot20 compliance. (Read more on LOT20 here) (lot20.org)