Need help in identifying brand of baseboard heater. One is 8 1/2" tall and other is 10" tall.
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Looks like it might be Sterling. Specifically their Kom-Pak and Senior series.
Any electrical machine will have a nameplate somewhere with model number and vital information such as voltage and current rating.
Heaters typically do not ugly-up their products by putting the nameplate on the outside, where it would also be vulnerable to being painted over. There must be a cover plate to access the wiring; the nameplate is typically installed behind that.