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The heater is a cylinder about 3 or 4 inches high, with a galvanized top but open on the bottom and the electronics (waffle thermostat, heating element and wiring) are inside. If the bottom is not flush to the floor--say elevated on, but not completely covered by, bricks like mine...
I use the galvanized double waterers on the galvanized heater. I'm not sure they use an awful lot of electricity compared to say an animal bowl heater since they keep the temperature just above freezing. However you do need to raise them off the floor with bricks/pavers and make sure they...