need to replace baseboard heater???

I need to replace a baseboard electric heater in bath, the circuit for this is a double 20 amp, there are no label on old heater and not sure what to go with , a 500 watt 240 volt 30 inch or a 350 watt 240/208 volt baseboard, would one of these work for me? also would a 22 amp 120/240 volt thermostate work with these , any help on this would be great thanks.: