I don’t remember it much other than enjoying watching it.

I also remember playing the theme song for it in my middle schools band.

It’s a silly thing, but if it glows orange, and if any of that orange light escapes or is visible from the window, it is not 100% efficient. But this is just pedantic in reality, even cheap heaters will do a good job of converting electricity into heat.

Unless it is visible to the window at which point the light escapes and doesn’t heat your house 100% efficiently