Live nowPrime Day 2026October 6 to 7, 2026Starts in04d13h47m02sSee the deals

Image Slideshow Items

  • Phyn Protect
  • Phyn Protect photo 2
  • Phyn Protect photo 3
  • Phyn Protect photo 4
  • Phyn Protect photo 5
  • Phyn Protect photo 6
  • Phyn Protect photo 7
  • Phyn Protect photo 8

Phyn Protect

An inline valve with an ultrasonic flow sensor, pressure testing and offline leak protection, installed on the main line and run entirely over Wi-Fi.

3.6
8 ratings
$579.99
As an Amazon Associate I earn from qualifying purchases
Launch Year: 2021

Model: PHYPF011

Open selection
Price alerts

Water Shutoff Valve price drops, every week

We check the price of every Water Shutoff Valve in the catalog daily, and email you the drops.

Smart home deals and news, straight to your inbox

Price drops, new releases and the smart home news worth knowing.

No spam. Unsubscribe in one click.

Your subscription could not be saved. Please try again.
Please enter a valid email address.
Your subscription has been successful.
Our review

Phyn Protect Review: A Whole-Home Water Monitor With a Built-In Shutoff Valve

The verdict

Phyn Protect (the renamed Phyn Plus 2nd Gen) is an inline smart water shutoff that is cut into the main water line, so one device watches the whole house instead of a sensor in every room. It pairs a Badger Meter ultrasonic flow sensor with pressure and temperature sensing, learns how the home normally uses water, and can close the valve on its own when flow turns abnormal, even if the internet is down. The trade-offs are a plumber-led install, no battery backup and a Wi-Fi only link, with Alexa, Google Home and Home Assistant covered but not Apple Home, SmartThings or Matter.

Best for
  • Homeowners who want whole-home leak protection
  • Houses with a main line up to 1-1/4 inches
  • Alexa and Google Home users
  • People who want no subscription fee

Pros

  • Inline valve and flow sensor in one device for the whole house
  • Ultrasonic flow sensor with no moving parts
  • Plumbing Check pressure test can run on a schedule
  • Offline Leak Protection keeps working without Wi-Fi
  • Freeze alerts and pre-freeze warnings
  • Works with Alexa, Google Home and Home Assistant
  • IP55 rated with a two year transferable warranty

Cons

  • Needs to be cut into the main line, so a plumber is recommended
  • No battery backup, the valve holds its last state on power loss
  • Wi-Fi only, with no hub or other radio
  • No Apple Home, SmartThings or Matter support
  • Valve exercise schedule is not published
  • Wired leak sensor cables are sold separately

Who is the Phyn Protect for?

Phyn Protect is aimed at single-family homes that want a shutoff valve installed on the main line, not a clamp-on retrofit. It has 1 inch NPSM male threaded ends and suits mains up to 1-1/4 inches, with adapters sold separately, and Phyn recommends a licensed plumber for the one to two hour job. Because it sits right after the meter, it sees every fixture, and the app reports water use by fixture type as well as hourly, daily and monthly charts. It can monitor several properties from one account.

How does Phyn Protect detect leaks?

It combines an ultrasonic flow sensor with no moving parts, pressure sensing sampled many times a second and a temperature sensor. After a learning period it unlocks Auto Shutoff, which asks you about unusual water activity and closes the valve if nobody answers in time. Plumbing Check closes the valve and watches for a pressure drop to find slow leaks and pinhole leaks, and it can run on a schedule. Pre-freeze warnings and Frozen Pipe alerts cover winter, and Away Mode makes it more sensitive while you travel.

What happens during a power or internet outage?

The valve is powered from an outlet and has no battery backup, so on a power loss it stays in whatever state it was in; a manual shutoff tool on the mounting bracket lets you turn the water off or on by hand. If the internet drops while power stays on, Offline Leak Protection still shuts the water off when a high flow lasts long enough, although it only covers major leaks and sends no alerts until the connection returns.

What to know before you buy

Connectivity is Wi-Fi on a 2.4 GHz network with no hub, and there is no Bluetooth, Zigbee, Z-Wave or Thread radio. Voice control works through Alexa and Google Assistant, IFTTT can trigger other devices, and Home Assistant can read it through a community integration. Apple Home, SmartThings and Matter are not supported. Phyn Smart Water Sensors and sensor cables are sold separately, and the manufacturer does not publish whether the valve exercises itself on a schedule.

Is the Phyn Protect worth it?

It is a premium, install-once product, and the value comes from the built-in flow sensing, the pressure based leak test and the offline shutoff, with no subscription needed. If you want a quick DIY retrofit on an existing valve, a clamp-on actuator is simpler; if you want the valve and the leak detection in one certified, IP55 rated body on the main line, this is the kind of device to shortlist.

Frequently asked questions

Is Phyn Protect the same as Phyn Plus?

Phyn renamed Phyn Plus to Phyn Protect. Its FAQ says it keeps the same core water monitoring, leak detection and automatic shutoff technology, with an updated look and product specifications.

Do I need a plumber to install Phyn Protect?

Phyn recommends a licensed plumber, because the device is installed on the main water line. Installation usually takes one to two hours.

What pipe sizes does Phyn Protect fit?

It has 1 inch NPSM male threaded ends and is meant for pipes up to 1-1/4 inches. Adapters are sold separately.

Does Phyn Protect need a subscription?

No. The leak alerts, shutoff and app features described by Phyn do not require a paid plan.

Will it shut off the water if the internet goes down?

Yes, for major leaks. With power but no Wi-Fi, Offline Leak Protection closes the valve when a high flow rate lasts for a set time, but it sends no alerts until it reconnects.

Does Phyn Protect work with Alexa, Google Home and Home Assistant?

It works with Alexa and Google Assistant, and Home Assistant can control it through a community integration. It does not support Apple Home, SmartThings or Matter.

At a glance

Summary

Everything this water shutoff valve supports, grouped by category.

Size & Materials
Weather Resistance (IP55)11 × 4.4 × 2.8 in (27.9 × 11.2 × 7 cm)
Power
Wired
Connectivity
2.4 GHz WiFi
Integrations
Google HomeAlexaHome Assistant
Valve & Installation
Installation Type (Inline valve)Pipe Sizes
Leak Protection
Flow SensorMicro-Leak TestOffline Auto ShutoffWired Leak Sensor (Sold separately)Freeze Alerts

Price History

Loading price history...

Price alerts

Waiting for a better price?

We check this price every day and email you when it drops, along with the rest of the week's deals.

Company
Phyn logo

Phyn

3.6/ 5 avg ratingUnited States flagHeadquartered in United States

Phyn is an American smart water company, created in 2016 as a joint venture between Belkin International and Uponor, that makes whole-home water monitoring and shutoff devices. Its products read pressure and flow on the main line, learn the home's normal water use, detect leaks and plumbing problems, and can close the supply automatically. They connect over Wi-Fi with no hub and work with Alexa, Google Assistant and IFTTT, with water use reporting by fixture in the Phyn app.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Weather Resistance

IP55

IP55 rated (sealed against foreign particles and water); Phyn says it can be installed indoors or outdoors.

Dimensions

11 × 4.4 × 2.8 in (27.9 × 11.2 × 7 cm)

Weight

?

Power
Wired

YES

Plugs into an outlet within 12 feet (the product page says it ships with a 12-foot cord; the Phyn Protect FAQ lists a 4.2-foot outdoor-rated cable).

Battery Type

-

Battery Life

-

Battery Backup

NO

On power loss it stays in the state it was in and does not close; the valve can then be turned by hand with the manual shutoff tool.

Connectivity
2.4 GHz WiFi

YES

802.11 b/g/n at 2.4 GHz with an internal antenna.

Bluetooth

NO

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Other

NO

Integrations
Google Home

YES

Open or close the valve, check its state and ask about leaks with Google Assistant.

Alexa

YES

Through the Phyn Device skill: ask water use, turn the water off or on.

Apple HomeKit

NO

Samsung SmartThings

NO

Home Assistant

YES

Community (HACS) Phyn integration covers the Phyn account: valve control, away mode, auto shutoff control, daily usage, pressure, temperature and flow.

Matter

NO

Valve & Installation
Installation Type

Inline valve

Pipe Sizes

1" (up to 1-1/4" pipe)

One size with 1" NPSM male threaded ends, for mains up to 1-1/4"; adapters sold separately.

Motor Torque

-

Valve Exercise

?

Leak Protection
Flow Sensor

YES

High definition ultrasonic flow sensor built by Badger Meter with no moving parts, plus pressure and temperature sensing.

Micro-Leak Test

YES

Plumbing Check closes the water and watches for pressure loss: a drop of 4 psi over 3 minutes in the standard test, 4.5 psi over 10 minutes in the extended one; it can run on a schedule.

Offline Auto Shutoff

YES

Offline Leak Protection: with power but no Wi-Fi or cloud, it shuts the water off when a high flow rate lasts a set duration (catastrophic leaks only, no alerts until it reconnects).

Wired Leak Sensor

Sold separately

Phyn Sensor Cables are listed as compatible on the tech specs and sold separately.

Freeze Alerts

YES

Pre-freeze warnings, plus Frozen Pipe Condition and Freeze Emergency alerts.

Features
Automations

YES

Auto Shutoff after a learning period, scheduled Plumbing Checks, Away Mode, Phyn Smart Water Sensors that trigger the valve and IFTTT actions.

On sale now

3 other Water Shutoff Valves on sale

View all
Full comparison table

Compare the Phyn Protect with the other 9 Water Shutoff Valves

All Water Shutoff Valves in the catalog in one table: filter by what you need, sort by price or rating, and see exactly where this one lands.

  • 9 other Water Shutoff Valves
  • 34 specs compared
  • 29 filters
Open the full comparison
Head to head

Phyn Protect vs the competition

View all