WattzDog Nitro Power Saver 1200 Commercial Connects to a Breaker Box. - Dedicated 220 Volt, 20 Amp breaker The device is a whole house surge protector and electricity saver. The Wattzdog Power Saver 1200 Commerical unit is designed to lower energy bills Increases motor and appliance life and surge protect all your equipment inside of your house. Residential customers should see a savings of 10% to 35% on their electrical usage