Is it 110 or 220 volt system?

Great question. The submittal for this product states: "208/230V 1 Phase 60 Hz". For more technical information, you can check out the Submittal Data located here, Submittal. If you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representative and they would be happy to assist you. Thank you and have a wonderful day.