Well pumps for larger geothermal applications are normally of the lineshaft, vertical turbine type with the electric motor located on the surface. This type of pump with oil lubrication and adequate allowance for thermal expansion has proven to be a reliable design. Unfortunately, it is not an economical selection for small residential and commercial applications. In fact, there really is no completely satisfactory solution to small flow rate, hot water well pumping applications. The two most commonly used options are conventional electric submersible pumps and jet pumps