Verticle Sump Pumps are best used for sump where submersible Pumps may not be applicable to high cost , if it is stainless steel material and submerisble cannot be used for HOT PIT , as the motor need cooling VSP Pump advantage is that the motor is mounted on top , visible for inspection and bearing failures noise can be observed. Unllike Submersible Pump, maintenance team dont take action unless the pump is not running , by the time it is too late. Mechanical seal will be damaged by then, water gets into the motor and complete overhaul , rewinding is needed which proved costly VSP has no mechanical seal installed ,designed with minimum maintenance in mind.