The Model 1200 offers enhanced performance over 2.2 GPM @ 1000 PSI washers, which are very common. By increasing horsepower, you can increase pressure on 2.2 GPM to 1400 PSI or using 1000 PSI on increased gallonage to 3 GPM. Either way, you get extra performance at very little extra cost. It requires a 110 Volt electrical connection, and the water can be heated with oil, gas, or electricity.