I sell lots of heaters and the main problem is that people use the wrong heater for the wrong size room.
An econoheater should only be used in a bedroom that is less than 4 x 4m (most standard bedrooms are 3 x 3) if you use it in a living area it will not work properly because there is too much air to heat. In a bedroom they make the room lovely and warm, they won't make it HOT but it can get very warm with one on. Just makes it comfortable and VERY cheap to run.