Low Pressure Hi-Volume Vertical Pond Pump – 40,000 L/h, 550W

This is a different kind of pump to the rest of the range, and understanding why matters before you buy. It is a low-pressure tube pump: it is built to shift enormous volumes of water a short distance, not to push water high. 40,000 litres an hour on 550 watts is remarkable throughput for the wattage — but that efficiency comes precisely from not generating much pressure.

What it is for

Gravity-fed filter systems, wide waterfall lips, large landscape ponds and formal fountain basins where the water only has to rise a little. If you need to lift water several metres up a slope, this is the wrong tool and a conventional high-pressure pump is the right one. Used in its intended role, nothing touches it for litres per watt.

Reading the flow and head figures — important

The 40,000 L/h and 5.5 m figures are not achieved together, and on a low-pressure pump the gap between them is dramatic. Flow is measured at zero head, outlet level with the water surface. The 5.5 m figure is the shut-off head: at that height the pump moves no water at all. Output drops away steeply as lift increases — far more steeply than on a high-pressure pump. Plan for a lift of well under a metre if you want anything close to the headline flow.

The 110 mm outlet is part of the same logic. Anything narrower would throttle this pump badly, so do not reduce down the pipework and expect the quoted flow.

Handles dirty water

It passes solids up to 6 mm, which makes it usable in ponds with detritus rather than only in clean filtered circuits. Built-in protection covers overload, dry running and impeller blockage — the three things that normally destroy a pump of this size.

Specifications

• Maximum flow: 40,000 L/h at zero head
• Maximum lift (shut-off head): 5.5 m, at which flow is zero
• Power: 550 W
• Outlet: 110 mm diameter
• Maximum solids handling: 6 mm
• Supply cable: 10 m
• Size: 66 × 20 cm
• Weight: 4 kg
• Shaft: wear-resistant ceramic axle
• Protection: overload, dry-run and impeller blockage

Why the running cost is low

A pump this size runs continuously, so the 550 W figure is what determines the cost of ownership. The efficient motor and electronics are the reason maintenance and running costs on these tube pumps stay low relative to output — and the ceramic axle is the part that usually determines whether a big pump lasts years or months.