Choose E-Command 4 when you require an electrical subpanel on the pool pad. If you want entry level control, but you need a power subpanel on the pool pad ? E-Command 4 is for you. It offers the same level of automation as OnCommand but with a built in sub panel.Automate basic pool and spa functions and save you up to 75% on your pool?s energy costs. Automating your variable-speed pump can save you up to $1,200 a year - maximizing water flow while minimizing energy consumption, so both you and your energy bill can relax.