Purported to be the first-ever outdoor dishwasher, this unit uses about 3.8 gallons per wash and features focused spray zones to ensure that the entire load gets clean. Designed with a stainless steel interior and exterior, the unit has six wash programs, six wash temperature settings, and a triple filtration system. Cost: $4,990.Kalamazoo Outdoor Gourmet. 800-868-1699. www.kalamazoogourmet.com.