Self-priming pumps are inherently designed to allow the pump to re-prime itself typically under lift conditions. A submersible pump (or electric submersible pump (ESP)) is a device which has a hermetically sealed motor close-coupled to the pump body. A submersible pump motor that is protected against overheating by cooling technology inherent to the design.  Pumping water from a deep well requires a deep well jet pump. Deep well pumps are cost efficient and require little maintenance after installation.