Sonoff Hydro DUO vs YoLink Smart Sprinkler Timer

Real-time app alerts for low battery, water shortage (flow under 5 L/min), water leakage (flow detected after the valve closes) and freeze risk, with an option to close the valve automatically on a water shortage.

Alarm Strategy settings send app push, email and SMS notifications, and can trigger YoLink sirens, SpeakerHubs or a scene. The timer also reports low battery in the app and blinks its LED red when the batteries need replacing.

The user guide states the timer connects to the internet through a YoLink hub and does not connect directly to WiFi or the local network. The radio is LoRa, rated up to 1/4 mile in open air.

The timer can be used as an action in a YoLink automation (for example, start watering when a soil moisture sensor reads low), and Control-D2D pairs it directly to another YoLink device so it keeps working without internet or cloud.

Daily, monthly and half-yearly charts of watering duration and volume per zone, viewable and downloadable for up to 6 months.

The app keeps 180 days of watering logs, showing when watering started, how long it ran and how much water was used, plus a watering calendar view.

Built-in flow meter reading 2 to 45 L/min, which the valve uses for volume-based watering and per-zone usage tracking.

The integrated flow meter measures real-time water flow and total usage, which is what makes gallon-based watering and the usage logs possible.

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

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

SONOFF documents the Hydro DUO on Home Assistant through both Zigbee2MQTT and ZHA, listing which features each exposes. ZHA additionally needs the Hydro_DUO_ZHA_Script SONOFF publishes.

The official Home Assistant YoLink integration lists this exact model in its supported devices: YS4103-UC (Sprinkler Timer).

Each schedule can be set by duration or by capacity, with a user-set failsafe time limit that stops the cycle if the target volume is not reached.

Volume Mode delivers a set amount of water instead of running for a set time, selectable per schedule alongside Duration Mode.

Each schedule lets you pick the watering duration or the watering volume, and the built-in flow meter measures the water actually delivered.

Up to 6 smart schedules per channel, 12 in total, with rain delay, seasonal multipliers per month and weather-based skipping of the next 24 hours.

Up to 12 schedules at a time, with start and end dates, repeat days (daily, weekly, odd/even or custom cycles) and start times. Schedules run on the device itself, so no internet connection is required.