I imagine that this is probably dumb question: is there any chance the new brooder heat source is coated with teflon or in the family of teflon? Seems like a lot of manufactures of heating things have a tendency to put that on the heaters to ''help them stay clean or clean easier". Bad thing is that when teflon gets hot, it kills birds. Many a pet bird owner (even pet stores) have found that out the hard way. It's not really something a lot of people know about. I only know about it because I used to go to an avian veterinarian, and learned from him. And learned from experts that would give talks at bird club meetings. (pet birds)
Also learned not to use cleaning products or things to "make the air smell better in your home", as they can kill pet birds (or any kind of bird). I know of a lady who lots thousands of dollars worth of birds when her new house cleaning person, used various cleaners that are generally used and are purchased in most stores. The birds were spread all through out her house, and the air conditioning system spread the fumes through out the whole house.