David, One Horsepower is generally considered to require about 750 watts. so 2.25 HP will need a solid 1700 watts. This is probably a peak rating, but none th less it must be on a 20 amp circuit that isn't used much.
If you have a coule 200 watt outside lights on at the same time, it will get very close to the max rating of a 20 amp circuit. tom
