What is a submersible pump?

A submersible pump is a water pump that must be placed in the water. Generally speaking, these pumps are used to drain water. Especially in inconvenient situations. For example, groundwater that rises in basements or souterrains. Boats that are flooded or river floods. The submersible pump owes its name to the fact that it must be submersed in water.

There are different types of submersible pumps, which are mainly distinguishable by the type of water that must be drained. For instance, there are clean water submersible pumps. Think of rainwater, for example. At the same time, waste water submersible pumps can drain water containing sand, soil and residue. Submersible pumps that process waste water containing suspended solids are naturally more suitable for coarser material. The impeller at the bottom of the pump breaks down suspended solids so that they can be effortlessly drained.

A submersible pump can be equipped with or without a float switch. A float switch is useful when the pump must switch on or off automatically. However, if a room must be fully drained, it is usually be done manually. The pump must be switched off in time to prevent dry-running. Some pumps are even equipped with both a manual and automatic mode (float switch).

What type of submersible pump should I buy?

There are different types of submersible pumps available, which can easily be adjusted to the water/liquid to be pumped. There are also situations that make pumping water more difficult. However, solutions are often available. For example, in certain cases it may be necessary to dry vacuum a room. Submersible utility pumps can be used for this purpose. It may also be that such rooms have restricted accessibility. Special internal float switches have been developed for such cases, so that the pump can continue to operate manually. Moreover, these pumps are very small, allowing them to be placed in sumps.

Another, more specific, submersible pump is the saltwater submersible pump. In addition, submersible pumps are often used on farms, especially when pumping water that contain faeces. Naturally, there are multiple solutions available for such situations. Faeces contain corrosive substances that may affect the pump and its seals (rubber closures). These submersible pumps are completely protected against these substances.

How does a submersible pump work?

The bottom of the pump has a suction grate, which directly sucks the water into the pump. Once sucked up, the water is transferred to the delivery diameter via the pump housing, allowing the water to leave the pump. This delivery diameter is connected to a drain hose or pipe through which the water can escape. Given that these pumps cool themselves with pumped water, they can be wholly or partly submerged in water. Dry-running of submersible pumps is therefore a significant risk. For this reason, there are no submersible pumps that can completely suck spaces dry in automatic mode (on the basis of the float switch). This is however possible with some submersible pumps in manual mode. Even up to a few drops of water can be wiped up. In essence, submersible pumps are the most easy to operate water pumps. The hose is screwed onto the pump. Simply connect it to a power socket and the pump will do its job or immediately start when the float switch is activated.