Horse power gives some indication of what the performance curge may be; however it is important to review the manufacturers data. The curve not only indicates the GPH (gallons pumped per hour and minute at five foot height intervals, but it also documents the maximum pumping distance allowed before the pump will shut off.
Many manfacturers not only provide a parts list, but they also make their parts easily available through Amazon. This is extremely helpful because the parts are genuine manufactured parts and can easily be installed without a plumber. Zoeller and Wayne are known for making their parts avaiable through Amazon. Other companies such as Liberty Pumps and Superior only sell from their website or directly through a distributor. One key fact to keep in mind when buying a new sump pump is that parts are more readily available for cast iron pumps because they are built to last longer. Hopefully your water pump parts list is available here. and you can replace a failed part rather than discard the pump. This is the eco friendly way.
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