Depends on the plate and the ambient temperature of the room they are in.
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Plates work well, but for $15 you can get a reptile heater for your lamp fixture and they work well too!Thanks for the information I have seen these and if I ever brood in the house again, which I mostly let mamas do it. I think that would be something to look into instead of the heat lamp.
Surface temperature of the box surface under the plate is a little over 90fKnow this is an old thread, but what's the ambient temp under these? think mine is breaking
High enough for the ducklings to stand underneath.How high up do you position the plate?