I just bought the Dyson AM04. I tried to research this product before buying, but could find no information about specifications. Even the Wattage was a mystery at first. Dyson themselves could/would not provide any useful info! So I was compelled to write this review to help others decide whether to buy it or not. So... It does heat a room evenly but only a small, well insulated room. 16-20m2 max. In very cold weather it will struggle to reach room temperature (21 C) and probably won't... The thermostat is not `intelligent' and works like on any other heater, IE the heater will go on and off every few minutes according to setting. This means that the temperature in the room eventually goes down and you have to put the heater back on `full blast'. It is as energy efficient (or not) as any fan heater, though does heat the space quicker and more evenly so maybe a little saving there... It is only 2kw so will not do the job of a more powerful heater despite the 'Air Multiplier Technology'. It is very noisy so not suitable for a bedroom. It does look good and well designed... It is not, in my opinion, worth the huge price tag. If you are looking to heat a large space this is definitely not for you. If you need to heat a small space and have money to burn-go for it.