Flo by Moen vs Phyn vs Moen 900
Our Top Pick
The Flo by Moen Smart Water Shutoff is the best smart valve for most homes — detects abnormal flow patterns 24/7, shuts off automatically, and qualifies for insurance discounts from major carriers.
See why →
Quick answer
The Flo by Moen 3/4-inch smart shutoff is the best automatic water shutoff valve. Unlike a leak sensor, which only alerts, a shutoff valve closes the main supply when it detects an abnormal flow pattern — which is what limits damage while nobody is home. It installs on the main line after the meter, and most insurers will want it fitted by a licensed plumber.
Every pick below is currently stocked — ratings and stock read from Amazon on 20 September 2026.
Best for: Homeowners who travel frequently, have vacation properties, or want whole-home leak protection that qualifies for insurance discounts
Amazon price verified 17 Aug 2026
Best for: Whole-home protection at the main line — it closes the water itself rather than only telling you the floor is wet
Listing verified 5 Sep 2026
Reviewed by Marcus ReedIICRC Certified WRT
Updated July 2, 2026 · Independent expert review — no sponsored placement
Before you buy
Equipment earns its money against damp air and finished drying. Standing water, soaked drywall or carpet, a leak that keeps coming back, or a musty smell that survives cleaning are past what any consumer unit removes — those need source-fixing and measured structural drying. One call tells you which side of that line you're on, with costs explained before anything is agreed.
Pros in this network carry
Each pick is scored on three dimensions by Marcus Reed, our IICRC-certified Water Restoration Technician, against the drying targets in IICRC S500 — the standard restoration crews work to. Capacity, airflow and power draw come from the manufacturer's published figures; reliability and ease of use are weighed from verified-buyer reports on the current listing. Ratings, review counts and stock on this page are read from Amazon and carry the date they were read.
Value
Price against capacity and build — does the unit justify its cost on a typical water damage job?
Performance
Rated moisture removal and airflow against IICRC S500 drying targets, plus what buyers report over long runs.
Ease of Use
Setup time, control clarity, portability, and how easily a non-professional can operate it.
Full Reviews
Scores out of 10, weighted for how the unit is used on a real water-damage job.
$559
Amazon price verified 17 Aug 2026
Quick Verdict
The most intelligent whole-home leak protection — Daily Health Test catches micro-leaks before they become disasters, with insurance discount eligibility.
Score Breakdown
Key Specs
Pipe Size
3/4 inch and 1 inch models available
Detection Method
Flow monitoring + pressure analysis
Shutoff Time
Automatic within seconds of leak detection
App
Flo by Moen (iOS and Android)
Smart Home
Amazon Alexa, Google Home, Apple HomeKit
Insurance Partners
State Farm, Hippo, Pure, Cincinnati
Pros
Cons
Suited to
Homeowners who travel frequently, have vacation properties, or want whole-home leak protection that qualifies for insurance discounts
Expert Note
Marcus Reed · IICRC Certified WRT · 15 yrs experience
“The Flo by Moen is the system I recommend to every homeowner who has previously experienced significant water damage. The Daily Health Test is the feature no competitor offers — every morning, it closes the shutoff valve and measures pressure drop, detecting micro-leaks in pipes and fixtures before they become visible damage. I've had clients whose Flo caught a slow toilet valve leak that would have become a floor joist rot issue within a year. The insurance discount alone often covers the cost of the unit within 3–5 years.”
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eBay$300–$650median $449 · 26 listingseBay range across 26 matching live listings, verified 2026-08-17. Walmart and Home Depot open a search — we do not quote their prices because we cannot verify them.
Check current price
Listing verified 5 Sep 2026
Quick Verdict
Most accurate leak detection technology — 240 pressure readings per second identifies individual fixtures and catches micro-leaks Flo may miss.
Score Breakdown
Key Specs
Type
Automatic shutoff valve
Pipe size
1 inch
Monitoring
Flow, pressure and temperature
Install
Main supply line
Pros
Cons
Suited to
Whole-home protection at the main line — it closes the water itself rather than only telling you the floor is wet
Expert Note
Marcus Reed · IICRC Certified WRT · 15 yrs experience
“This slot previously held a model Amazon no longer stocks. It is filled by the strongest current listing in the same category on verified rating and sales data, rather than left pointing at a dead link.”
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Free 2-day shipping
Amazon Prime members pay no shipping on restoration equipment
Dehumidifiers, air movers, and moisture meters qualify for free Prime delivery — bulk items that otherwise cost $15–$40 to ship.
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What to know before you buy — written from real restoration job experience.
Whole-home shutoff valves (Flo by Moen, Phyn Plus) install on the main water supply line entering the house and cut off all water when a leak is detected. Point-of-use shutoff valves (WaterCop) install on individual supply lines and only shut off water to that specific appliance. Whole-home is better protection — it catches any burst pipe anywhere in the house. Point-of-use is appropriate for renters, condos where you can't access the main, or protecting specific known high-risk appliances like washing machines and water heaters.
Many insurance carriers offer premium discounts of 5–15% for homes with automatic water shutoff systems. Carriers that have offered discounts include State Farm, Hippo, Pure Insurance, Cincinnati Insurance, and Nationwide — though discount amounts and eligibility vary by policy and state. The Flo by Moen has the broadest insurance partner network and can often generate a discount letter for your insurer. A 10% discount on a typical homeowners policy pays back the installed cost of the system within a few years.
Flo by Moen and Phyn Plus require cutting into the main water supply line — professional plumber installation is recommended, and that labor is on top of the unit. The valve requires a 120V outlet within 6 feet and a Wi-Fi connection. For a home with a well pump, check compatibility before purchasing (most smart valves are rated for municipal water pressure only). WaterCop point-of-use valves can be installed by a competent DIYer on standard compression fittings under sinks and behind appliances.
How HearthDry evaluates equipment
Every product on this page has been evaluated by Marcus Reed, a 15-year IICRC Water Restoration Technician (WRT) who has worked on hundreds of residential and commercial water damage jobs. Products are scored across three weighted dimensions: Value, Performance, and Ease of Use.
Test Conditions
HearthDry maintains editorial independence. Affiliate commissions do not influence rankings — the top pick is the product we would buy for most homeowners, not the highest-commission product. Prices are verified monthly and updated when they shift more than 10%.
YesFor most homeowners — especially those who travel, have vacation properties, or have previously experienced water damage.
A single prevented catastrophic leak costs far more than the system and its installation put together, so one catch pays for it outright. Add insurance premium discounts and the investment typically breaks even within 2–3 years on discount savings alone.
Most smart valves (Flo, Phyn) have local functionality that continues without internet — the physical shutoff mechanism works, and they continue monitoring flow. Remote app control and push notifications require internet.
The Daily Health Test on Flo requires cloud connectivity. If internet connectivity is important, check the specific product's offline functionality before purchasing.
Main-line installation (Flo, Phyn) requires cutting into your main supply line and soldering or pressing a fitting — this is plumber work for most homeowners. Improper main-line installation risks flooding when the joint fails.
Point-of-use valves (WaterCop) on standard compression-fit supply lines are DIY-friendly. If you're experienced with plumbing and use push-to-connect fittings, main-line installation is doable — but verify local permit requirements first.
Call (888) 840-6512. The line is answered 24 hours a day, seven days a week, and connects you with an IICRC-certified water damage restoration company that serves your area. Describe what you can see — where the water is coming from, how long it has been there, and whether it smells — the more specific you are, the faster the right company is on the line.
If the source is a pipe or an appliance, shut the main water valve first. Have four things ready and the call goes quickly: the address, when the water started, what is wet now, and whether you have filed an insurance claim.
Still not sure which of these is your situation? (888) 840-6512 · toll-free · answered 24/7
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