So what exactly is the difference between a sump pump and a submersible pump?
It can be a little confusing, but is quite simple really.
In essence a submersible or immersible pump is one which allows the entire assembly (including the electric motor) to be placed under water, whereas a sump or pedestal pump keeps the electric motor above water level.
Both are essentially used for the same purpose: to raise fluid to a higher level without the risk of cavitation (see our earlier post on cavitation) caused by differing pressures.
Single stage pumps are used for drainage, sewage pumping, general industrial pumping, slurry pumping and are even popular with aquarium filters.
Multiple stage submersible pumps are typically lowered down a borehole or well for water extraction.
A sump pump (or pedestal pump) is used to remove water that has accumulated in a sump pit; a hole used to collect water which can enter via the drainage network. The motor is not submerged and remains above the liquid.
In some cases, a sump pump is used when a lower floor is below the sewer lines, to pump greywater or blackwater waste from that floor to the sewer lines.
For a copy of the ecex leaflet please click Pumps, valves & pipework
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