Sprinklers

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Smart irrigation splits cleanly in two, and buying across the line wastes real money.

A tap timer screws onto an outside tap, between the tap and the hose. It turns one water supply on and off on a schedule. This is what almost every British garden wants: a soaker hose down a border, a drip line into pots, a sprinkler on the lawn in July.

A multi-zone controller replaces the wired timer box that drives a buried irrigation system with several solenoid valves — front lawn, back lawn, beds, each watered separately. If your garden does not already have that system in the ground, this is not the product for you, and installing one is landscaping rather than shopping.

Tap timers

Eve Aqua

The Eve Aqua is the one to buy, and for a UK garden it is close to the only sensible answer in this directory. It fits a standard outside tap, runs on batteries, joins over Thread with no bridge and no manufacturer account, and puts a schedule in the Home app that runs whether or not your phone is anywhere near.

The automation worth having is not the schedule on its own — it is watering that skips itself. Pair it with an outdoor temperature or weather reading from a sensor and the watering can stop when it has been raining, which is what actually saves water.

Check price on Amazon UK

GARDENA smart system

GARDENA’s kit works through the GARDENA smart Gateway, which is the hub the rest of the range talks to — Water Control, Irrigation Control, soil sensors. It is the more complete garden system if you intend to build one out, and it is a bridge purchase rather than a single accessory: the gateway does nothing on its own.

We have no verified Amazon UK link for the gateway. GARDENA sells a great deal on Amazon under similar names, and the smart-system parts are easy to confuse with the ordinary mechanical timers, so buy from GARDENA or a garden retailer where the model numbers are explicit.

Multi-zone controllers

Yardian Pro

The Yardian Pro is a six-zone smart sprinkler controller with Wi-Fi and HomeKit support, for a garden with a wired irrigation system already in it. Six zones is a large garden by British standards and an ordinary one in California, which tells you who this product is for.

Check price on Amazon UK

RainMachine

RainMachine is the other well-known HomeKit multi-zone controller, and its distinguishing idea is that it runs its scheduling locally rather than depending on a cloud service — so the garden keeps being watered when the broadband is down or the company is having a bad year. Not listed on Amazon UK; buy direct.

What to check before you buy

Your tap thread. UK outside taps are usually 3/4 inch BSP, and timers are often sold with a 1 inch adaptor or none at all. This is a two-pound part that ruins a Saturday. Look at the tap before ordering.

Where the water pressure comes from. A tap timer opens and closes a valve; it does not pump. A drip system fed by a water butt with no pump will disappoint you regardless of how clever the timer is.

Winter. A battery tap timer must come off the tap before the first frost, or the water inside it freezes and splits it. Whatever you buy, plan on removing it in October and putting it back in April.

Battery life and where the batteries are. A tap timer lives outdoors in the weather with the valve it drives. Check the battery compartment seals properly and how you get at it, because you will.

Range to the house. The tap is outside, usually behind a brick wall, which is the worst case for any radio. Thread accessories mesh through other mains-powered Thread devices, so a nearby indoor plug or bulb can make the difference between a reliable timer and one that drops off.

A rain sensor, or a weather-aware schedule. Watering a garden through a wet week is the failure mode that makes people unplug the whole thing. Either the controller reads the weather itself, or you build the automation from a sensor.

A home hub, as ever. Schedules and automations need a HomePod or an Apple TV at home.

The full list of HomeKit-compatible irrigation controllers and tap timers in the directory is below.