Does anyone know if you can use this thermostat for more than one small rack? I noticed that there are three outlets on the Herpstat ND cord. I have one 3 tub Animal Plastics rack with flexwatt heating and just ordered a second rack (same model). The Herpstat ND is rated up to 600 Watts and I don't think that these racks use that much. Could I do this or should I just order another thermostat? Thanks.