Compact, lightweight 20,000 BTU/hr Heat pump for Small pools and Spas. Above Ground pools up to 18' Round. Spas-any size. 120 volts-60HZ USA voltage Heat and cool modes. Highest efficiency in the industry 4.81 COP. Union connectors and hose adapters are included for 1 1/2" pvc plumbing, and hoses. Foot print: 36" x16", weighs 100lbs