Other reviewers have commented that it doesn't give out a lot of heat, and the air coming out of the unit certainly isn't as hot at that which came out of the small, flat 2kW heater I bought it to replace. It does, however, have a much more powerful fan, moving a much greater volume of air per second.
The lower temperature by itself doesn't mean that the heater is less effective at heating. The unit is transferring more energy (by 50%) to a proportionally greater volume of air passing through it, so while the air leaving the heater isn't as hot there is much more of it, which in total transfers more heat energy to the surroundings.
In summary, it's better for heating a whole room then my previous 2kW heater with a small fan but not as good for sitting in front of.