Above Ground Pumps
If you own an above-ground or semi-inground swimming pool, you need to choose between an inground pump and an above-ground pump. An above-ground pump usually runs on 110/120 volts and connects to a standard wall outlet. It must be positioned below the waterline of the pool, as it relies on gravity to direct water into the pump basket for priming.
Inground Pumps
An inground pump can be installed above the waterline in a pool because it does not rely on gravity-fed water like an above-ground pump. It has the capability to draw water from a lower level into the pump, a process known as self-priming. Typically, inground pumps operate on 220 volts but can switch to 110 volts if needed. Additionally, most inground pumps must be hardwired for installation.