Our high flow water pumps are built to move large volumes of water quickly, making them ideal for dewatering construction sites, draining pools, ponds, lakes and rivers, and clearing flood water from large areas. The range includes both ...
Our high flow water pumps are built to move large volumes of water quickly, making them ideal for dewatering construction sites, draining pools, ponds, lakes and rivers, and clearing flood water from large areas. The range includes both submersible pumps (110V and 230V) and petrol or diesel engine driven pumps, so you can choose the right option whether or not mains power is available.
The right pump depends on where the job is and what power supply is available. Submersible high flow pumps sit in the water and are ideal for sumps, chambers, basements and any site where 110V or 230V power can be supplied. Engine driven pumps sit on the surface and draw water up through a suction hose, making them the right choice for remote sites, large outdoor areas or anywhere mains power is not guaranteed.
The deeper read: what's in this range, how to pick, and when to talk to us before you buy.
The difference between a standard pump and a high flow pump is significant. The table below compares popular standard pumps with the high flow models in this range:
The impeller is the spinning component inside the pump that does the actual work of moving water. Larger impellers move more water per rotation, which is the single biggest factor in flow rate. Compare an APP HD-15 impeller next to a Tsurumi LB480 and the difference in bore size is immediately obvious. This is also why high-flow pumps are physically larger and heavier than their standard-flow counterparts.
| Pump | Type | Flow Rate (ltr/min) |
|---|---|---|
| Stream SPP-2 | Standard submersible | 70 |
| APP HD-15 | High flow submersible | 830 |
| Honda WX10 | Standard engine pump | 142 |
| Honda WB30 | High flow engine pump | 1,090 |
The APP HD-15 moves around 12 times more water per minute than the Stream SPP-2, and the Honda WB30 moves over 7 times more than the Honda WX10. On a large dewatering job, that can mean finishing in a fraction of the time.
Flow rate is determined largely by the size and depth of the impeller. A deeper impeller blade moves more water with each rotation, which is why the APP HD-15 (830 ltr/min) significantly outperforms a pump like the Tsurumi LB480 (225 ltr/min). The number of impellers stacked inside the pump affects the head (vertical lift) rather than the flow rate, so high flow and high head pumps are designed differently.
Impeller: Size Matters
High flow pumps are typically specified for trade, industrial and contractor use, so the build quality is heavier than a domestic pump. The APP HD-15 uses wear resistant ductile iron and stainless steel components rather than the plastics found in entry level submersibles. The engine driven pumps in this range feature carbon ceramic mechanical seals, lightweight aluminium pump housings and cast iron impellers, allowing them to handle clear and lightly contaminated water on demanding sites without premature wear.
High flow pumps cost more than standard models, but on the right job they pay for themselves quickly. A pump that moves water 7 to 12 times faster reduces hire time, labour and fuel use, and gets the site operational sooner. For one-off small jobs a standard pump may be enough, but for repeat use, larger volumes or time-critical dewatering, a high flow pump is almost always the more cost effective choice.
