I have a large Premeir (says Comfort on top) plate and raised 25 chicks with it last year and and have 25 again this year. They are in the garage where night time temps get down to low 50s. I always keep the plate higher at one end (at a height where the largest chicks don't quite touch it when standing) and low at the other (at a height that doesn't quite touch the chicks when they are sitting). They seem to do fine with those heights. The plate is too hot for me to keep my hand on it, but doesn't burn me at all with a quick touch, and I don't use a dimmer. If you do this and the plate is still burning chicks, I would contact the company.
These Mama Heating pads that Blooie has described seem to work really well, too, and are cheaper, I'm sure.
These Mama Heating pads that Blooie has described seem to work really well, too, and are cheaper, I'm sure.