Water timers
A tap timer is bought for a fortnight in August and judged on what it did while nobody was watching. That makes silence the important property: none of these five has a rain sensor, only one is stated to survive water in its battery compartment, and every one of them will keep its schedule perfectly while a kinked hose delivers nothing. This guide is the five, and the sequence that makes them work.
A tap timer is a device whose entire value is realised while nobody is present.
Which inverts how it should be judged. The question is not what it does when it works — they all open a valve on a schedule — but what happens when it does not, and whether you find out.
The answer, across all five, is that nothing happens and you do not find out. A timer with a flat battery does not water. A timer with a kinked hose waters into a kink. A timer whose tap was left closed runs its programme perfectly against a shut valve.
None of these five reports back on whether water actually moved.
It is what fails first, and on a tap timer that is the batteries.
One of these five publishes the relevant claim: standard batteries stated to last several growing seasons, in a double-sealed compartment.
That second half is the one that matters. A tap timer sits outdoors, on a tap, in the rain, for a whole season. Water reaching the battery contacts corrodes them, the contact resistance rises, and the valve stops having enough current to open — mid-schedule, in the second week of August, with nobody there.
It is the commonest way one of these dies and only one of the five addresses it.
The habit that costs nothing: new batteries at the start of every season, whatever the old ones read. A set of alkaline cells is a fraction of the cost of the plants.
A dial, at the tap. One of these is set by turning and pressing, and gives three independent schedules by weekday plus a Water Now button. Nothing to pair, nothing to update, nothing that depends on a network being up in a fortnight’s time.
Fixed cycles and LEDs. Another gives three cycles — 12, 24 and 48 hours — with fourteen LEDs and a start delay of up to 23 hours. Less flexible and entirely self-contained, and the LEDs mean the state is readable at a glance without a phone.
An app. Three of these are app-controlled, and the app is where the flexibility is: one publishes up to 20 independent schedules, one publishes 8 programmes and 15 frequencies with an LCD, and one can water by volume as well as by time.
One needs a hub. One does not.
The Zigbee model requires a Zigbee 3.0 gateway, and it names the compatible models — which is the right thing to publish, because a hub you do not own is a second purchase and a second box on a socket.
The Wi-Fi model needs nothing but a 2.4 GHz network with no gateway, and adds Alexa and Google Assistant.
The trade is coverage. Wi-Fi reaches as far as your router does, and a tap at the bottom of a garden behind a brick wall is frequently just past that line. Zigbee is low-power and forms a mesh, so it hops through other devices and reaches further — at the cost of the hub.
There is one clear test and it takes a minute: stand at the tap with a phone and look at the signal. If it is one bar, the Wi-Fi timer will be unreliable exactly when it matters.
One of these five can be set to deliver a quantity rather than a duration.
That is a better instruction than minutes, and the reason is pressure.
A schedule set in minutes delivers whatever the mains happened to be doing. Pressure varies through the day — higher at dawn, lower when the street is showering — so a ten-minute programme delivers different amounts on different days, and a timer that counts litres does not.
On a bed of pots, where the difference between enough and too much is small, that is worth having.
None of these five has a rain sensor.
Two publish a manual rain delay instead — one of them up to 30 days — which is you looking at a forecast and deciding, from a phone, not to water.
That is useful and it is not automatic. A fortnight of rain while the timer runs its programme is a fortnight of waterlogged pots, and nothing on this shelf prevents it.
The cheap workaround is a saucer test: if the pots are sitting in water when you get home, the schedule was too generous, and next year’s setting is shorter.
Test it for three days before leaving. Not the timer — the whole system. Tap open, timer set, hose laid, and go and look at whether water arrives where it is supposed to. A timer that opens a valve into a kinked hose is a timer that reports success.
Check the filter. Every one of these is fed from a tap that carries grit, and a blocked inlet screen is a timer that runs dry. This site’s drip irrigation shelf makes the same point about emitters, and its sprinkler shelf about nozzles: the water arriving is never as clean as it looks.
Water fewer times, for longer. A daily two-minute programme wets the top two centimetres and trains roots to live there, where they dry out fastest. Two or three long soaks a week get water down to where the roots should be.
And pick the hour. Early morning: the soil is cool, evaporation is lowest, and the leaves dry during the day. Evening watering leaves foliage wet all night, which is how fungal disease gets going — and one of these five is the one that will do it at five in the morning without anybody getting up.
3 independent schedules by weekday, dial-and-press, Water Now
Three independent schedules on a dial-and-press interface, with a Water Now button that does not disturb the programme.
Best for: One tap, three different watering needs — a lawn, a bed and pots on different days
2.4 GHz Wi-Fi, no hub, IP65, 20 schedules, 1–30 day rain delay
Wi-Fi without a gateway, IP65 with double silicone seals, twenty schedules, a rain delay and offline alerts.
Best for: A tap within Wi-Fi range, where the watering should be checkable from somewhere else
Zigbee 3.0, hub required, volume control, 6 months of history
A Zigbee valve with quantitative watering and six months of history — and it needs a hub, which the listing says twice.
Best for: A household that already runs a Zigbee hub and wants watering in the same automation as everything else
8 programmes, 15 frequencies, 0–8 bar, ¾" thread, LCD
Eight programmes and fifteen frequencies on an LCD, a stated 0 to 8 bar range, and it works at no pressure at all.
Best for: A rain butt or a low-pressure line, where the timer has to open with almost nothing behind it
3 cycles (12/24/48 h), 14 LEDs, delay to 23 h, ½" and ¾" adapters
A mechanical-feeling timer with fourteen LEDs instead of a screen, three cycles, a delay function and both tap adapters.
Best for: A single tap and a single hose, for somebody who wants a timer and not a smart device
Two. One is set with a dial and a press and gives three independent schedules by weekday; another has three fixed cycles at 12, 24 and 48 hours with fourteen indicator LEDs. Both are set standing at the tap, which is the arrangement that keeps working when a router does not.
Wi-Fi needs no extra hardware and reaches only as far as your router does — and a tap at the end of a garden is often exactly where the signal stops. Zigbee is low-power, forms a mesh and reaches further, and it needs a hub. One of these is Wi-Fi with no gateway; another requires a Zigbee 3.0 hub and names the compatible models.
No — not one of the five. Two publish a manual rain delay instead, one of up to 30 days, which is you deciding not to water from a phone rather than the timer deciding for itself. That is the honest version of the feature and it is worth knowing before a wet fortnight.
The batteries, and water reaching them. A tap timer lives outdoors on a tap, in the rain, all season, and corroded contacts stop a schedule mid-programme while nobody is there. Only one of these five publishes a sealed battery compartment, and it is the single most relevant durability claim in the category.
For : One tap, three different watering needs — a lawn, a bed and pots on different days
Main strength : Three schedules that are genuinely independent, including by weekday
Main limitation : No connection thread, no power source, no IP rating and no pressure range
For : A tap within Wi-Fi range, where the watering should be checkable from somewhere else
Main strength : An IP65 rating with double silicone seals, published — the only IP code on this shelf
Main limitation : No connection thread and no pressure range published
For : A household that already runs a Zigbee hub and wants watering in the same automation as everything else
Main strength : Waters by volume, not only by duration — unique on this shelf
Main limitation : Needs a Zigbee 3.0 hub, which is a separate purchase and a separate ecosystem
For : A rain butt or a low-pressure line, where the timer has to open with almost nothing behind it
Main strength : A published working pressure range — the only one on this shelf
Main limitation : Waterproof only with the cover screwed on, which is a condition rather than a rating
For : A single tap and a single hose, for somebody who wants a timer and not a smart device
Main strength : Every available watering time is listed for every cycle — no other listing here does that
Main limitation : No screen, so the state has to be read off fourteen indicator lights
Head-to-heads already published between two models from this guide or this aisle.
The models here come from the catalogue of this site. Specifications are those published by the manufacturer and on the Amazon product page; prices are what Keepa reported on the date below, and both move. The ranking uses declared specifications, the balance of stated strengths and limitations, and price. No product on this site has been physically tested, and nothing here claims otherwise.
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