The size of a sump pump is not the determining factor when choosing or replacing a pump. There are many models out there, some are simple and compact and others offer many features and come in a larger size. Sump pumps are designed to keep water off the basement floor and away from the foundation. These pumps can be installed for various reasons, such as poor construction, age deterioration, and land erosion. Regional slope of the land and waterfall frequency determines how many gallons per minute or gallons per hour you’ll need to pump in order to remove the water quickly. A standard 1/3 horse power pump or a 110 volt pump will work for almost any home. Size is determined by the pump’s capacity to push water into a pipe and away from the foundation. If your pumps capacity is 3,000 gallons per hour, it should work.