I have never heard of a heated perch and I wonder what it is made of. The best perches are made from hard wood. As jenb128 says there could be problems if a bird was not comfortable on a heated perch.
A bird can keep warm by fluffing up its feathers and squatting down on its feet, but of course any bird that comes from a tropical climate will need to have some form of heating in an outdoor aviary during the winter. A heated perch might be the answer for some birds, but I think keeping the general temperature at a comfortable level is also important for tropical birds housed outdoors.
