Shop/Garage Heater suggestions please

I will get an image of that doogie, I will be pleasantly surprised if the R value is that high! I have insulated 8 and 10 foot doors that seal quite well


UPDATE-Due to my fat fingers I actually ordered the u it in post 18 by accident - 7500W model. I will keep it and install it in the next few days. I need to get wire/40A breaker/wire retainers.

Let ya know what happens!

ThAnk you all for your help!