YoLink Valve Controller 2 with EVO Valve Operator

Powered from a wall outlet through an AC adapter, so the valve never runs out of battery.

A plug-in valve needs an outlet within reach of the main line, and it stops working during a power outage unless it also has a battery backup.

The batteries a battery-powered valve runs on. Most retrofit actuators use standard AA cells, while some meters use a long-life lithium pack.

Standard AA batteries are cheap and easy to replace; a sealed lithium pack lasts longer but has to be bought from the manufacturer.

How long the manufacturer says the batteries last under normal use, typically measured in months or years.

Turning a stiff valve takes a lot of energy, so battery life depends on how often the valve is closed, exercised or tested.

A battery that keeps a plug-in valve working when the power goes out, either built in or sold as an optional module.

Storms that cut the power are also when pipes freeze and sump pumps fail, so a valve that keeps working on battery protects the house exactly when it is most at risk. Battery-only valves do not need one.

Range: The 2.4 GHz band offers a longer range, meaning it can cover larger areas and penetrate solid objects like walls more effectively than 5 GHz.

Speed: Generally, 2.4 GHz provides slower speeds compared to 5 GHz due to a lower maximum data rate.

Interference: More prone to interference since many other devices (like cordless phones, microwaves, and Bluetooth devices) operate on the 2.4 GHz frequency, leading to potential congestion and slower network performance.

Bluetooth is a wireless communication technology used for exchanging data over short distances.

Bluetooth enables devices to communicate wirelessly within a short range, typically up to 10 meters (about 33 feet) for most consumer devices.

Z-Wave is known for its low power consumption, making it ideal for battery-powered devices. It supports a mesh networking topology, allowing devices to communicate with each other directly or through intermediary nodes, thus extending the overall network range and enhancing reliability. The protocol supports data rates of up to 100 kbps, suitable for transmitting control commands and sensor data.

Zigbee is a wireless communication protocol designed for low-power, short-range applications, commonly used in smart home devices, industrial automation, and other areas requiring reliable, low-data rate communication. It features low power consumption, making it ideal for battery-operated devices, and supports short-range communication, typically up to 100 meters. Zigbee employs mesh networking, allowing devices to relay data through each other to extend range and improve reliability. It supports data rates up to 250 kbps, suitable for small data packets, and ensures interoperability among devices from different manufacturers if they conform to Zigbee standards. Security is robust, with AES-128 encryption for data protection.

Zigbee devices need a Zigbee-compatible hub to connect and communicate with other devices in your smart home setup.

Thread is a wireless communication protocol designed specifically for Internet of Things (IoT) devices, providing secure, reliable, and scalable networking. Unlike some other protocols, Thread is IP-based, which means it can seamlessly integrate with existing internet infrastructure. It operates in the 2.4 GHz frequency band and uses mesh networking to enhance reliability and extend range by allowing devices to relay data through each other.

Thread is optimized for low power consumption, making it suitable for battery-operated devices. It supports low-latency communication, which is crucial for real-time applications like home automation and security systems. The protocol ensures high security with AES-128 encryption and end-to-end security at the network layer. Thread also supports over-the-air updates, ensuring devices can stay up to date with the latest features and security patches.

Thread-enabled devices require a Thread Border Router (such as certain smart home hubs or routers) to connect to your home network and other Thread devices.

Additional connectivity options not covered by the standard protocols.

This may include proprietary wireless protocols, infrared, or other specialized communication methods.

Google Home serves as a central hub for a variety of smart devices, including lights, thermostats, cameras, and speakers. It leverages Google Assistant for voice control, enabling users to manage their smart home with simple commands.

Amazon Alexa is one of the most widely used smart home systems, known for its compatibility with a vast array of devices. Users can control everything from smart lights to appliances using voice commands through Echo devices.

Apple HomeKit is designed for users in the Apple ecosystem, providing a seamless way to control compatible smart devices through iOS devices using the Home app or Siri. It emphasizes security and user privacy.

SmartThings is a flexible platform that connects a wide range of devices from different brands, offering a unified interface for control. It supports various communication protocols, allowing for extensive device compatibility.

Home Assistant is an open-source platform that allows for extensive customization and integration of a wide variety of smart devices. It supports a multitude of protocols and brands, making it ideal for tech-savvy users.

Matter is a unified, open-source connectivity protocol designed to standardize and simplify communication between smart home devices from different manufacturers. Developed by the Connectivity Standards Alliance (formerly the Zigbee Alliance), Matter aims to improve interoperability, security, and reliability across various smart home ecosystems.

Matter operates over existing networking technologies, including Ethernet, Wi-Fi, and Thread, providing flexibility in device connectivity. Its IP-based nature allows seamless integration with existing internet infrastructure and cloud services. Matter uses a mesh networking topology, particularly when operating over Thread, to enhance range and reliability by allowing devices to relay data through each other.

Security is a cornerstone of Matter, with end-to-end encryption and secure device onboarding processes ensuring robust protection for data and privacy. Matter also supports over-the-air updates, allowing devices to stay current with the latest features and security enhancements.

How the device controls the water. A retrofit actuator is a motor that clamps onto the handle of the shutoff valve you already have and turns it, so it installs in minutes with no plumbing work.

An inline valve is a motorized valve that is cut into the main water line, usually by a plumber. It costs more to install, but it often carries a flow sensor that lets it detect leaks on its own, and some insurers only recognize this type.

For a retrofit actuator, the range of shutoff valve sizes its bracket can mount on. For an inline valve, the pipe sizes the valve is sold in.

Most homes have a 3/4 inch or 1 inch main line. Measure your pipe before buying, because a valve that does not fit cannot be installed.

The turning force of the motor, usually given in newton meters (N·m).

Old shutoff valves that have not been turned in years can be very stiff. A retrofit actuator with more torque is more likely to close them reliably, which matters most in an emergency.

The valve turns itself partway on a schedule (for example once a month) and back, to keep it from seizing.

A shutoff valve that sits open for years can build up mineral deposits and stick, and a stuck valve is the most common reason an automatic shutoff fails when it is finally needed.

A built-in sensor that measures how much water is flowing through the main line.

With a flow sensor the valve can detect a leak on its own (a burst pipe, a running toilet, water flowing for longer than normal) and close without waiting for a leak sensor to get wet. It is also what shows your water usage in the app.

A test the valve runs on its own, usually at night: it closes briefly and watches the water pressure for any drop.

A falling pressure with the valve closed means water is escaping somewhere, which finds slow leaks of a few drops per minute that flow sensing alone misses.

The valve closes automatically when a leak is detected even if the internet is down, because it talks to its leak sensors directly or through a local hub instead of through the cloud.

Leaks do not wait for a working connection. A valve that depends on a cloud service to receive the alarm from a leak sensor will not close during an internet outage.

The valve includes or accepts a leak sensor connected to it by a cable, usually a probe or a sensing cable placed on the floor next to the water heater or the main line.

A wired sensor closes the valve directly, with no wireless link, hub or battery in between, which makes it the most reliable trigger for the spot right next to the valve.

Notifications when the temperature at the valve or of the water drops close to freezing.

Frozen pipes are one of the most common causes of burst pipes in winter, and an early warning gives you time to add heat or shut off the water before a pipe cracks.

The ability to open or close the valve automatically based on other devices or schedules, such as closing the water when a leak sensor gets wet or when everyone leaves on vacation.

Automations are what turn a remote-controlled valve into automatic flood protection.

It keeps working, and can be controlled from inside your own network, when the internet is down: over Zigbee, Z-Wave or Thread through a local hub, a native Matter or HomeKit connection, a documented local API or an official local integration.

A product without local control stops answering during an internet outage and depends on the maker's servers staying online.

Every advertised feature works without a paid plan: app control, alerts, history and the smart home integrations.

Some products put video history, monitoring or their integrations behind a monthly plan that can cost more per year than the hardware did.