1500 watts is 1500 watts.
I have used something similar to this UpNorth for 25 years (several different brands /models, they are all pretty much the same). Forced air heat, multiple settings. Will heat up your bathroom in minutes if you keep the door closed. The thermostat can be adjusted for how warm you want the room. $17
https://www.amazon.com/JNDRO-Portabl...s%2C170&sr=8-8
Dyson makes nice products, good quality with fancy features, but waaay too expensive IMHO.