I recycled the package and literature long ago but the website information has no reference to not using it in below 50 weather. IMO, that is a CYA statement for EcoGlow.
It wasn't an EcoGlow Brooder but a Titan Incubator. Same concept.
It's a 12"x12" and I brooded 15 chicks under it. It got down into the 20s at night. Coldest night was 23. I tucked it into the corner of the built-in brooder with the solid walls and tossed an old bath towel over it to make it...