Garden sprinklers are one of the most common reasons people go looking for a pump, and one of the easiest to get wrong.
A sprinkler does not just need water, it needs water at the right pressure and in enough quantity to throw it properly, and if either falls short the sprinkler barely turns or covers half the area it should. The good news is that the requirement is straightforward once you know what a sprinkler requires.
Here is what garden sprinklers need, why they underperform, and how to choose a pump that runs them well.
Quick answer: Most garden sprinklers need around 2 to 3 bar of pressure, which is about 20 to 30 metres of head, and enough flow to feed every sprinkler running at once. A sprinkler that will not work usually has too little pressure, too little flow, or both. To run more than one sprinkler, the pump must supply the combined flow of all of them at that pressure.
How much pressure do garden sprinklers need?
Most domestic garden sprinklers are designed to run at roughly 2 to 3 bar, which in pump terms is about 20 to 30 metres of head.
Some domestic garden sprinklers are deliberately designed to restrict flow so that they provide a broadly consistent spray pattern across a range of pressures. Hozelock, for example, states that its oscillating sprinklers are designed to provide “100% even water coverage regardless of the water pressure” between 1 and 10 bar. This is typically achieved by limiting flow through the jets to around 6 litres per minute.
When a sprinkler deliberately restricts the flow, it increases resistance within the system and causes the pump to operate at a lower flow and higher pressure than it otherwise would. This can move the pump away from its preferred operating range and, if the restriction is significant or prolonged, may contribute to overheating, cycling or premature wear. For pumped systems, it is therefore preferable to use a sprinkler that provides the required coverage without excessively restricting the flow.
The DAB Divertron is an excellent option for irrigation through a hose or garden tap. However, it contains internal electronics that automatically start and stop the pump in response to demand. It is not recommended for use with heavily restricted outlets or certain oscillating sprinklers, as the limited flow can cause the pump to repeatedly switch on and off.
Larger, commercial or bespoke sprinkler systems may have very different flow and pressure requirements.
That pressure is what flings the water out and gives the sprinkler its reach, so if the pressure is low the spray is weak and the coverage shrinks.
It helps to know how pressure and head relate, which we cover in how head height equates to pressure: the short version is that 10 metres of head is about 1 bar, so a sprinkler wanting 2 to 3 bar needs a pump that can hold 20 to 30 metres of head at the flow the sprinklers draw.
Pressure alone is not enough: you also need flow
This is the part people miss. A sprinkler needs pressure to throw the water and flow to keep feeding it, and the two have to arrive together.
A pump can produce plenty of pressure with the sprinkler off, but the moment water starts flowing, the pressure drops, and if the pump cannot supply enough flow at the working pressure the sprinkler fades. That is why a small pump that looks powerful on paper can still run a sprinkler poorly: it holds the pressure only until real water moves. You are looking for a pump that delivers both the pressure and the flow at the same point on its curve, which is exactly what a performance curve shows, covered in pump curves explained.
Matching a pump to a sprinkler
Submersible Well Pumps
The APP MVH-10A is a good match for pulsating and larger sprinklers, including tripod-mounted units, rather than fine oscillating types. It's a multi-stage pump built for higher pressure, with a maximum head of around 32 metres and a maximum flow of around 110 litres per minute. In practice a pump rarely runs at the very end of its curve, so at a mid-curve operating point you'd expect flow closer to 50 litres per minute.
That combination of moderate to high pressure with moderate flow suits sprinklers designed to throw water further rather than ones designed to spread a fixed, low flow evenly (like the Hozelock oscillating type discussed above).
A pulsating or tripod sprinkler rated for roughly 800 to 3,000+ litres per hour (13 to 50 l/min) across a 1.75 to 5 bar range sits comfortably within what the MVH-10A can deliver.
Thanks to this combination of pressure and flow, the MVH-10A can often run garden irrigation systems for medium to large gardens, and is even capable of supplying smaller commercial sites.
The MVH-10A also has an automatic float switch, so if the water level in the source (butt, tank, chamber, or open water) drops too low, the pump shuts off rather than running dry, which is useful protection for unattended irrigation setups.
Using a surface mounted or booster pump instead of a submersible
Not every setup has somewhere for a submersible pump to sit. If you're drawing from a shallow tank, pond or other above-ground source rather than a well, butt or chamber the pump can be lowered into, a surface-mounted booster or multistage pump is often the better fit.
For most sprinkler systems drawing clean water from a tank, or other source, the Speroni RA(M) range is worth considering. It's a self-priming, continuous-duty multistage surface pump designed to provide the pressure needed for small sprinkler irrigation, with the smaller models (RAM 3, 4, 5) suited to garden-scale use and flows around 90 litres per minute, and heads from 34 to 60 metres depending on model.
Where several sprinklers are running together, the hose run is particularly long or the water has to be pumped uphill, the larger RAM 40/50 models step up to around 160 litres per minute with heads of 49 to 61 metres, giving more headroom for irrigation or commercial use.
The final selection should always be based on the combined flow required by the sprinklers and the pressure needed once suction lift, elevation and pipe friction have been accounted for.
Can one pump run two sprinklers?
Yes, but only if it can supply the combined flow of both at the pressure they need.
This is the key point about running more than one sprinkler: the pressure requirement stays roughly the same, but the flow requirement adds up.
Two sprinklers that each need a certain flow need double that flow between them, at the working pressure, or both will weaken. So the question is not really can a pump run two sprinklers, it is can this pump deliver the total flow of two sprinklers at 2 to 3 bar. If you want to run several, you size the pump for all of them running together, or you water in zones so fewer run at once.
What about the outside tap and hose?
Many people run a single sprinkler happily straight off an outside tap, because a good mains supply can provide both the pressure and the modest flow one sprinkler needs.
The trouble starts when the mains pressure is low, when the run to the sprinkler is long, or when you want to run several sprinklers at once, at which point the tap cannot keep up.
That is when a pump earns its place: either boosting the pressure, or drawing from a tank, water butt or watercourse to feed the system. If you are drawing from a water source rather than the mains, our guide to pumping water from a river or stream covers the intake side.
