What are submersible pumps? Submersible pumps are pumps which are submerged in the rainwater which is then pumped back. Since submersible pumps move underneath the collected rainwater, submersible pumps can pump the rainwater to the correct height. On the other hand, the power and permissible pressure of a submersible pump must be taken into account, there are many different submersible pumps. Submersible pumps pump the collected rainwater from the storage back to the tapping points where the rainwater can be reused. Examples of these tapping points can be: toilet flushing, garden watering or your washing machine. Residental construction Submersible pumps are especially suitable for homes where there is little space in the home for an inner pump. Even when noise is expected from a self-priming rainwater pump in the home, it is advisable to consider an underwater submersible pump. Another important reason for choosing submersible pumps is the distance between the rainwater citerns and the available space in home. If this distance is greater than 15 meters, the time should be chosen for pressurized submersible pumps.