Yes they say install 20" to provide warming for underneath the heater.It looks like a giant brooder plate. That may work really well. Please keep us posted it you decide to use it. I am bookmarking it as I could install it in the ceiling of the cluckle hut and provide better heating if necessary.
It doesn't heat the surrounding air, just heats up the object (hen).
If I decide to get it for sure I will give my opinion
