what size electrical line is required for this unit ? 6K (4 head units)

For this unit we recommend 14/4 mini split control wire. This wire can be purchased additionally as an accessory on the product page. It can be purchased by the foot or it can be purchased in a kit that also includes the refrigerant line set and condensate drain line (the ductless mini split indoor installation kit. These can be found in the accessory section which is located under the "add to cart" button. For more assistance, please give us a call.