Sonoff Hydro ONE Lite

With the child lock on, the local button is disabled and control is only available through the app.

No flow meter. SONOFF's Hydro series comparison shows the flow meter on the Hydro ONE and the Zigbee Smart Water Valve, and marks it absent on the Lite, which is the difference between the two models.

Smart scenes trigger on valve state, an irrigation duration reaching a set number of minutes, or the battery dropping below a set level, and act on valve state or a delay. Scene linkage is available on every gateway SONOFF lists, including Alexa and SmartThings.

Daily, monthly and half-yearly charts of watering duration, viewable and downloadable. The Lite records duration only, where the Hydro ONE also records volume.

Six groups of smart schedules, each set by duration, with odd or even days, an interval of 1 to 30 days or specific weekdays. Rain delay skips tasks manually, seasonal adjustment applies a monthly multiplier, and weather-based adjustment skips the next 24 hours on rainfall, humidity or temperature thresholds.

SONOFF's own Hydro series comparison marks the Lite's smart schedules as duration only, against duration and capacity on the Hydro ONE. Without a flow meter there is no volume for a schedule to target.

The Lite is the Hydro ONE sold without the flow meter, so it cannot measure or target a watering volume.

Real-time app alerts for low battery and freeze risk, the latter triggered when the local minimum temperature drops below a threshold you set. Without a flow meter the Lite cannot raise the water shortage and leakage alarms its Hydro ONE sibling does.

Bluetooth Low Energy powers SONOFF's Proximity mode, which lets a phone control the valve and set schedules directly when there is no Zigbee gateway or the outdoor signal is unstable. Zigbee mode and Proximity mode are used one at a time, not together.

Zigbee 3.0 end device, so it needs a coordinator or gateway to join a network. SONOFF lists the ZBBridge-P, ZBBridge-U, NSPanel Pro and iHost as its own gateways, plus the Dongle Plus MG24, Dongle Lite MG21, Dongle Max and ZBDongle-P/-E for Home Assistant.

The product page states the valve integrates with ecosystems like Home Assistant or Google Home through a Zigbee gateway or coordinator. SONOFF's bridged device list confirms Google Home is the one Matter platform that renders the water valve device type, reached through a SONOFF Matter bridge or through eWeLink cloud-to-cloud linking.

Alexa supports neither the Matter Water Valve device type nor any irrigation category, so the valve has nothing to map to

SONOFF's Matter bridge device list covers its Hydro water valves but states they are supported only in Google Home, because Apple Home does not implement the water valve device type. Apple Home has no Zigbee radio either, so there is no other route in.

SONOFF's compatible Zigbee hubs table for the Hydro ONE Lite lists SmartThings through the AeoTec Smart Home Hub V3 acting as the Zigbee gateway, covering manual irrigation and scene linkage. Owners also report pairing it to an older Samsung V2 hub, where it appears as an on/off switch that schedules drive.

SONOFF documents the Hydro ONE Lite on Home Assistant through both Zigbee2MQTT and ZHA, listing which features each exposes. ZHA additionally needs the script SONOFF publishes; without it the valve arrives as a plain on/off entity.

The valve is not a Matter device itself: it is Zigbee 3.0 only. SONOFF republishes its Hydro water valves to Matter through its bridges (ZBBridge-U, iHost, NSPanel Pro, or eWeLink CUBE with a SONOFF Zigbee dongle), exposing valve configuration and control.

Input is 6V from four 1.5V AA cells, housed in a pull-out compartment with an integrated gasket. There is no mains or USB option.

SONOFF rates battery life at about 1 year under normal use, tested at two watering runs per day of 30 minutes each. The valve alerts on low battery and shuts off at a critical charge to avoid runaway watering.