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Water feature pump flow rate and head

Updated: 17.10.2026

A pump can be labelled 1,500 litres per hour and still produce a weak trickle at the top of your feature. The missing part is head: every centimetre of lift and every restriction reduces the available flow. To choose a water feature pump flow rate and head, measure vertically from the water surface, decide how much water you want at the outlet and leave capacity below the pump's maximum. The [water feature pump comparison](/hub/hot-water/water-feature-pump) shows the headline figures for twelve listings, but none supplies a complete performance curve. A qualifying purchase can earn a commission at no extra cost to you.

A pump can be labelled 1,500 litres per hour and still produce a weak trickle at the top of your feature. The missing part is head: every centimetre of lift and every restriction reduces the available flow.

Our top picks

BARST BARST 450 L/h 12 V

Best overall

BARST BARST 450 L/h 12 V
9.2/10about £32.99
View offer
LIFERUN LIFERUN 3000 L/h

Alternative

LIFERUN LIFERUN 3000 L/h
8.8/10about £24.99
View offer
Flintronic Flintronic 800 L/h

Preis-Tipp

Flintronic Flintronic 800 L/h
8.6/10about £9.99
View offer
On this page
  1. 1.Head is measured from the water surface
  2. 2.Maximum head means almost no flow
  3. 3.Use a width rule with care
  4. 4.When the listing prints two heights

Head is measured from the water surface

Static head is the vertical height from the water surface to the outlet. The depth of the pump below that surface is not added. A pump 40 cm under water, with a spout 80 cm above the surface, has 80 cm of static head, not 1.2 m. Measure at the normal operating level. Splash and evaporation add a little lift. Narrow hose, bends and nozzles add friction the listings rarely quantify, so do not match maximum head exactly. Note the lift, the hose diameter and the outlet before you look at litres per hour. A thin jet and a 20 cm spill need different flow at the same height. Supply and cable sit in the water feature pump buying guide.

Maximum head means almost no flow

Maximum head is the height at which flow falls to about zero. Water Garden's rough example has a pump producing around half its headline flow at half its maximum head. That sketches a curve. It is not a formula you can copy between brands, because the impeller, hose and nozzle change it. A pump stating 450 L/h and a 95 cm maximum head will not deliver 450 L/h at 95 cm. At that limit the flow should be close to nothing, and even at 50 cm only a maker's curve tells you the output. An 11,000 L/h pump with a 3.5 m head follows the same rule as the lift nears 3.5 m. Swell publishes flow at 0.5 m steps for its own pumps. Those numbers cannot be copied onto Knifel or LIFERUN. Where a listing gives one flow and one maximum head, leave a margin. A flow control can only throttle excess.
BARST BARST 450 L/h 12 V

Testsieger

BARST BARST 450 L/h 12 V
9.2/10about £32.99
View offer

Use a width rule with care

For a watercourse, Water Garden suggests about 1,000 L/h per 10 cm of width for a trickle and 2,000 L/h per 10 cm for a livelier flow. A 20 cm spill therefore starts near 2,000 L/h or 4,000 L/h, before head and hose losses. That is a channel rule of thumb, not a design calculation. A narrow jet uses far less water than a broad spill. If you are unsure, extra controllable flow is easier than a pump that is already too small. You can throttle down. You cannot create capacity the impeller does not have. A BARST at 250 L/h and 65 cm belongs on a low, narrow ornament. LIFERUN's 3,000 L/h and 2.8 m are more plausible for a taller jet. HOCANFLO's claimed 11,000 L/h is for a much broader feature. Jobs, not raw flow, are sorted in the best water feature pump shortlist.

When the listing prints two heights

The Dtopsun 350 L/h specification says 1.5 m, while a bullet describes a 0.7 m water column. The 600 L/h sibling pairs 1.5 m with 1.2 m. Plan on the lower figure unless the maker supplies a curve. PTSBENCO prints 1.5 m and up to 2 m. Knifel's 1,500 L/h model prints 1.8 m and 2 m. Neither pair tells you the flow at your height, and a high star score does not fill that gap. One UK Knifel review estimated roughly 40 L/h once the head passed a metre. Another reported a 1.5 m rise while emptying a pool. Different hose and use make those notes non-comparable. Near a stated limit, choose more head, or a maker who publishes flow at height. A pump that still cannot reach a socket safely is the wrong product. RCD and cable stop points are in the installation guide.

Common questions

How many litres per hour do I need?
For a watercourse, Water Garden's rule of thumb is about 1,000 L/h per 10 cm of width for a trickle or 2,000 L/h for a livelier flow. Add capacity for your measured head and hose resistance. A nozzle fountain may need less, so treat the width rule as a starting point rather than a specification.
Do I include the depth of the bowl?
No. Measure head vertically from the normal water surface to the outlet. A pump 40 cm below the surface does not add 40 cm to the head. Hose friction and fittings still add resistance, but they are separate from the static vertical measurement.
Why is the flow only a dribble?
The outlet may be too close to maximum head, or the hose, nozzle or inlet may be restricting flow. Unplug the pump, check the water level, remove safe-to-access debris and straighten kinks. If the route is clear, you may need a pump with greater usable flow at the measured head.
What should I do when two head figures disagree?
Record both figures and plan around the lower one unless the manufacturer supplies a clear correction or pump curve. Dtopsun and PTSBENCO listings in this comparison contain material differences between specification and bullet text. Do not assume the larger number describes useful flow at that height.
Is GPH the same as litres per hour?
GPH means gallons per hour, but the gallon type matters and casual conversions can introduce errors. Prefer the litres-per-hour figure on a UK listing. Where a listing already prints both, keep its stated pair rather than silently recalculating it. Flintronic, for example, prints 250 GPH alongside 800 L/h.

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Sources

Specialist sources from the research digest, plus the amazon.co.uk listings named there. Last reviewed 17 October 2026.

  1. Electrical Safety First — garden electrics (retrieved 17 October 2026)
  2. NICEIC — gardens and electrics (retrieved 17 October 2026)
  3. BSI — BS EN IEC 60335-2-41, particular requirements for pumps (retrieved 17 October 2026)
  4. GOV.UK — UKCA or CE marking in Great Britain (retrieved 17 October 2026)
  5. Water Garden — what maximum head means (retrieved 17 October 2026)
  6. Water Garden — watercourse pump guide (retrieved 17 October 2026)
  7. UK Water Features — which pump for a pond (retrieved 17 October 2026)
  8. IET Wiring Matters — protective measures, special locations (retrieved 17 October 2026)