Automatic Lawn Sprinklers

Choosing your automatic lawn sprinkler system

The different types of automatic sprinklers

The market offers three main families of automatic sprinklers for lawns. Rotary sprinklers turn a full 360 degrees and cover a uniform circular area, ideal for square or round lawns. Oscillating sprinklers sweep left to right with a perforated arm, perfect for rectangular surfaces and borders. Impact sprinklers combine a pulsing motion with rotation, offering coverage that falls between the two previous types.

Coverage area and range

Watering range varies from 5 to 15 metres depending on the model. A rotary sprinkler typically covers 80 to 350 m² depending on available pressure. Oscillating models reach 150 to 250 m² on rectangular areas 6 to 18 metres long. Measure your lawn before buying to determine how many sprinklers you need and avoid uncovered patches.

Materials and durability

ABS plastic sprinklers resist UV rays and remain affordable for typical seasonal use. Metal alloy models better withstand knocks and constant pressure, recommended if you water daily from May to September. Brass or stainless steel nozzles last longer than plastic ones when exposed to hard water.

Settings and watering precision for your lawn

Rotation angle and coverage zone

Modern rotary sprinklers let you limit the rotation angle between 20 and 360 degrees. This feature avoids watering paths, patios or walls bordering the lawn. Oscillating sprinklers offer a sweep width adjustment, typically between 3 and 18 metres. Favour models with visible dials or sliders over fixed systems.

Water flow and required pressure

Standard household water pressure ranges from 2 to 4 bar. An automatic sprinkler works properly from as little as 1.5 bar, but maximum range requires 2.5 to 3 bar. Average flow ranges from 200 to 600 litres per hour depending on the type and settings chosen. Check your outdoor tap’s pressure with a gauge before investing in a long-range model.

Spray range adjustment

Sprinklers fitted with adjustable nozzles offer variable range without changing equipment. This adjustment is made by rotating the head or via a limiting screw on the body. Three-arm or multi-nozzle models let you adjust each jet independently to adapt coverage to irregularly shaped lawns.

Installation and compatibility with your system

Connecting to your garden hose

The standard fitting is 15 mm (1/2 inch) or 19 mm (3/4 inch) in diameter, compatible with most hoses on the market. Favour sprinklers with quick-click connectors rather than screw-on ones for easy repositioning. Check for an O-ring in the fitting to ensure a watertight seal under pressure.

Stability and ground fixing

Oscillating sprinklers sit on a wide base that ensures stability on mown grass. Rotary models need a spike or tripod to withstand rotational force and wind. Some impact sprinklers include a weight or anchoring spikes that prevent movement while watering.

Adapting to your mains pressure

If your pressure exceeds 4 bar, a pressure reducer protects the sprinkler from surges that prematurely wear out seals and bearings. Conversely, pressure below 2 bar limits range and creates dry patches. A booster pump can then improve performance if you’re using a pump or a rainwater harvester.

Selection criteria based on your lawn

Lawn area to be watered

For a lawn under 100 m², a single rotary sprinkler in a central position is enough. Between 100 and 300 m², one oscillating unit or two rotary sprinklers cover the whole area. Beyond 300 m², plan for several sprinklers or a system with a timer to water in successive zones and limit instantaneous water consumption.

Terrain shape and obstacles

Rectangular plots and side paths suit oscillating sprinklers best. Round or square lawns free of obstacles favour 360-degree rotary models. If trees, flower beds or hedges border the area, choose a model with angle adjustment to avoid wasting water outside the lawn.

Frequency of use

Occasional use during a heatwave justifies an economical plastic sprinkler. If you water three times a week from June to August, invest in an alloy model with sealed bearings. For fully automated daily watering, pair the sprinkler with a timer and check the manufacturer’s warranty on moving parts.

Maintenance and lifespan of automatic sprinklers

Cleaning the nozzles

Limescale gradually clogs spray outlets and reduces range. Remove the nozzles once a month during the season of use and soak them for 30 minutes in diluted white vinegar. A soft brush lifts off embedded deposits without scratching surfaces. Rinse with clean water before reassembling to protect the seals.

Winter storage and protection

Drain the sprinkler fully before the first frosts to prevent the body from cracking as water expands. Disassemble it and store it away from damp and UV exposure in a garage or shed. Metal models benefit from a light greasing of moving parts before winter storage.

Wear parts and repairability

O-rings, bearings and nozzles are the parts that naturally wear out. Check the availability of spare parts from the manufacturer before buying. A repairable sprinkler with standard components will cost you less than a full replacement every two years. Entry-level one-piece models generally cannot be repaired at all.

• Measure your lawn area to determine the coverage radius you need
• Check the water pressure available at your outdoor tap before buying
• Favour models with angle and range adjustments to fit borders
• Choose the sprinkler type based on your terrain shape: rotary for round areas, oscillating for rectangles
• Opt for durable materials if you water frequently or under high pressure
• Make sure the fitting is compatible with your existing hose (15 or 19 mm)
• Look for a stable system with a spike or wide base depending on the sprinkler type
• Check spare parts availability to extend the product’s lifespan

Sprinkler type	Area covered	Ideal shape	Minimum pressure	Advantages
360° rotary	80 to 350 m²	Round, square	1.5 bar	Uniform coverage, angle adjustment
Oscillating	150 to 250 m²	Rectangular	2 bar	Precise borders, width adjustment
Impact	100 to 200 m²	Mixed	1.8 bar	Versatile, gentle watering
Adjustable multi-arm	150 to 300 m²	Irregular	2.5 bar	Fine adaptation, modular coverage

How do I choose between a rotary and an oscillating sprinkler for my lawn?

Choose a rotary sprinkler if your lawn is square or round with no major obstacles, as it covers a circular area evenly. Opt for an oscillating one if your plot is rectangular or runs alongside a path or patio, since its side-to-side sweep waters in a strip without overspill. Measure your lawn’s length and width to determine the radius or range needed and check compatibility with the available pressure.

What minimum water pressure is needed for effective automatic watering?

The functional minimum pressure is 1.5 bar for simple rotary sprinklers and 2 bar for oscillating ones. Maximum range and optimal coverage require between 2.5 and 3 bar. Check your outdoor tap’s pressure with a gauge before buying. If your pressure is below 2 bar, favour a low-pressure model or consider a booster pump to improve watering performance.

Which material should I choose for a sprinkler used daily all summer?

For intensive use, favour a metal alloy sprinkler with brass or stainless steel nozzles. These materials better resist wear, knocks and corrosion than plastic, even reinforced plastic. Sealed metal bearings extend the lifespan of moving parts subject to constant rotation. An ABS plastic sprinkler suits occasional use but wears out faster under daily strain and high pressure.

Should I winterise my automatic sprinkler at the end of the season?

Yes, winterising is essential in regions where temperatures drop below zero. Fully drain the sprinkler by shaking it after disconnecting to remove any residual water that could freeze and crack the body or fittings. Disassemble it and store it somewhere dry and frost-free. Lightly greasing the metal moving parts before storage prevents corrosion over winter and makes it easier to get going again in spring.