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EN 60335-2-41, and a flow figure with nothing to lift

Pump listings print two headline numbers — litres per hour and metres of head — and they cannot both happen at once. The standard behind the appliance says nothing about either, but knowing where the figures come from is what stops a buyer sizing a pump from the wrong one.

What the standard pins down

EN 60335-2-41 is the part of the household-appliance family that covers pumps for household and similar use, including the garden pump, the pressure vessel set and the submersible pump used to empty a rain barrel.

Its subject is the appliance as an electrical device in a wet place. It fixes how live parts are enclosed in a machine whose whole purpose is to contain water under pressure. It fixes what must happen thermally when the motor is overloaded or when it is prevented from turning — an impeller jammed by grit is a stalled motor, and a stalled motor that is not protected is a fire. It fixes the supply connection, the cable and its anchorage, and the markings, including the rated input and the protection class.

It also fixes the mechanical integrity of the pressurised parts as they bear on safety: the pump body, the vessel where one is fitted, and what must be true of them under the pressures the appliance can generate.

What it does not promise

It does not define the performance figures. Maximum flow rate and maximum head are hydraulic characteristics stated by the manufacturer, and they are measured at the two opposite ends of the pump’s curve: the flow figure with the outlet open and nothing to lift, the head figure with the outlet closed and nothing flowing. Neither point is anywhere near where a garden hose actually operates, and a pump cannot deliver both at once.

This site therefore prints flow as a figure at zero head, and says so, rather than letting it sit in a table as if it described irrigation.

It does not promise suction lift. A self-priming pump has a limit imposed by physics rather than by the maker’s ambition, and how close a particular machine gets to it depends on the foot valve, the airtightness of the suction line, and the altitude.

It does not promise dry-running protection. Where a machine has it, the manufacturer states it; where it is silent, the absence is what this site prints.

And it does not promise anything about what the water is for. A pump certified as an appliance is not for that reason approved for drinking water, and a rain barrel is not a potable source.

The documents it sits next to

The general first part of the 60335 family applies with it. The threads on the inlet and outlet — the one-inch and three-quarter-inch fittings that decide whether your hose connects — come from thread standards that have their own pages here.

An outdoor pump’s ingress rating is under the IP code, and a submersible one’s continuous immersion level matters more than on any other shelf.

Which shelves it reaches here

The garden pump family cites it directly. The rain barrel, drip irrigation and sprinkler families cite it because on those shelves a pump is very often the missing component: a gravity-fed barrel will not drive a rotating sprinkler, and the pages say so.

Where a pump listing quotes a flow, a head and a pressure with no operating point named, the review reports all three and states the convention behind them. That is the single most useful sentence a pump page on this shelf can carry.

The questions that keep coming in

Will a 5000 l/h pump deliver 5000 litres an hour to my sprinkler?

No. The maximum flow figure is obtained with nothing to lift and nothing to push through — an open outlet at the pump. Every metre of height and every metre of hose reduces it, and a sprinkler at the end of a long run sees a fraction of the headline number.

What happens if a garden pump runs dry?

On many domestic pumps the seal is cooled by the water passing it, and running dry destroys it in minutes. Some machines carry a dry-running cut-out and say so; most on this shelf do not. It is worth checking before the first hot week rather than after.

Is a booster set the same as a garden pump?

A pressure vessel set — the kind with a tank and a pressure switch — starts and stops itself to hold a pressure, where a plain garden pump runs while it is switched on. They are different articles with different duty, and this site keeps them on the same shelf while saying which is which.

Last reviewed 26 September 2026