Commonly, transfer pumps are also known as semi-trash transfer pumps. What this means Is that transfer pump impellers are open vane, allowing debris to flow through the transfer pump without causing any real damage to the transfer pump. However, semi-trash pumps are not as easy to service. Full trash transfer pumps have larger impellers, that can allow larger debris and essentially grind smaller particles. Full-trash pumps have easily accessible internals from their quick release bolts.

This is dependant of the piping size you’re using and how far the distance is between the 2 transfer points. Large pipes create less friction loss (the pressure required to ‘push’ water at a distance). The larger the pipe, the less friction/energy is required the more water can flow from the transfer pump. 

Larger flows for transfer pumps allow for how quick your job gets done. Note – if you have a large distance to transfer over a height difference it may be worth looking at a closed vane impeller transfer pumps (see fire fighter pumps).

Self-priming means that the transfer pump has the ability to retain water/fluid after the very first prime. This still means you need to prime the transfer pump initially, however – after that the transfer pump will essentially look after itself.

This is important feature for transfer pumps as it removes any air blockages for future usages and essentially speeds up the operation/setup times.

Electric start, also commonly known as key start – requires the user to turn a key to start the motor of the transfer pumps.  These transfer pump units will require an external 12v power source (generally a battery).

Recoil Start, also commonly known as Pull Start – requires the user to pull the motor of the transfer pump over by hand, this is done with a recoil rope. Much like your common lawnmower. No battery is required for these transfer pumps.

It depends greatly on your physical abilities, if the user doesn’t have any ailments and is of fit physical stature then a recoil start transfer pump should be fine. Just note; depending on how long the engine is laid dormant for and/if it’s been in the weather, multiple pulls may be required to start the transfer pump.

If the user isn’t up to the physical strain that is required from pull starting the transfer pump engine, it’s highly recommended electric start upgrade is required.