That one is okay for a decent sized room if it's 6 feet in front of your freezing feet. If you want to heat the whole room/ apartment, go for this. Keep at least one window completely open for oxygen.
I know it's beating a dead horse, but a CO and a CO2 sensor is a life and death prep. Get both and remember that one is none and two is one. Also, people use these heaters all over the world, including in the USA without dieing unless they do it stupidly.