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Moen Flo Review 2026 — What the Smart Water Monitor and Shutoff Does, Which Size Fits Your Main, and a Better-Rated Alternative

Moen Flo Review 2026

What the Smart Water Monitor and Shutoff Does, Which Size Fits Your Main, and a Better-Rated Alternative

4 picks compared · prices, ratings and stock checked October 12, 2026

Our Top Pick

If buyer ratings weigh most, the Frizzlife LP365-P Smart Water Monitor and Automatic Shutoff, which fits 3/4 in and 1 in mains. If you want Moen Flo itself, the Moen Flo 3/4 in Smart Water Shutoff with 3 Flo Detectors, or the 1 in bundle for a larger main.

4.5 on Amazon · 363 ratings

Quick answer

Moen Flo is a smart water monitor and automatic shutoff fitted on your main line, usually by a plumber, where it tracks flow, pressure and temperature 24/7 and runs a daily MicroLeak test; but if you want the strongest buyer record among the main-line valves reviewed here, buy the Frizzlife LP365-P Smart Water Monitor and Automatic Shutoff, rated 4.5 stars across 363 Amazon ratings, which states 0.01 gpm leak detection and fits 3/4 in and 1 in pipe. If you want Moen's app and Flo Detectors, buy the Flo bundle that matches your main. Every valve here is a main-line install and needs power nearby.

Our Picks at a Glance

Every pick below is currently stocked — ratings and stock read from Amazon on 12 October 2026.

Best-Rated Main-Line Shutoff
Frizzlife LP365-P Smart Water Monitor and Automatic Shutoff (0.01 gpm Ultrasonic Leak Detection, Fits 3/4 in and 1 in)
Frizzlife LP365-P Smart Water Monitor and Automatic Shutoff (0.01 gpm Ultrasonic Leak Detection, Fits 3/4 in and 1 in)
4.5 from 363 Amazon ratings · checked 12 Oct

Best for: Homeowners who want main-line leak shutoff with the strongest buyer record in this group, on a 3/4 in or 1 in main

Pipe size (stated):
Fits 3/4 in and 1 in pipe; installation parts included; the unit has 1 in male NPT ends
Leak detection (stated):
Ultrasonic flow sensing down to 0.01 gpm

Listing verified 13 Oct 2026

How this page was made: we compare the current Amazon listings, the makers' published specs and what verified buyers report, then rank by fit for the job. Ratings, review counts and stock are read from Amazon and dated. We earn a commission on purchases through our links; it does not change the order. Reviewed by Marcus Reed, IICRC-certified Water Restoration Technician.

Full Reviews

Each pick in detail: what the listing states, what buyers report, and where it falls short.

#1
Best-Rated Main-Line Shutoff

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on Amazon ↗

Listing verified 13 Oct 2026

Frizzlife LP365-P Smart Water Monitor and Automatic Shutoff (0.01 gpm Ultrasonic Leak Detection, Fits 3/4 in and 1 in)See it on Amazon ↗

Quick Verdict

Frizzlife LP365-P Smart Water Monitor and Automatic Shutoff: main-line shutoff with stated 0.01 gpm detection and one body for 3/4 in and 1 in mains.

Key Specs

Pipe size (stated)

Fits 3/4 in and 1 in pipe; installation parts included; the unit has 1 in male NPT ends

Leak detection (stated)

Ultrasonic flow sensing down to 0.01 gpm

Display (stated)

LP365-P shows water pressure and flow rate; the LP365 shows temperature and flow

Alerts (stated)

App notifications, text messages and phone calls; the valve closes automatically

App (stated)

Smart Life app with remote control and daily and monthly usage reports

Certification (stated)

NSF/ANSI 61 and 372

Pros

  • States its smallest detectable flow, 0.01 gpm, a figure the Moen listings do not give
  • One unit fits 3/4 in and 1 in mains, with the installation parts included
  • NSF/ANSI 61 and 372 certified, the standards for drinking-water parts and low lead content
  • Alerts by app, text and phone call, so a leak reaches you even with app notifications off

Cons

  • Runs on the general-purpose Smart Life app rather than a dedicated water app like Moen's
  • Needs an outlet near the main to stay networked, and the listing does not say what happens in a power cut
  • A main-line install that the listing itself says should be done by a professional

Suited to

Homeowners who want main-line leak shutoff with the strongest buyer record in this group, on a 3/4 in or 1 in main

Our take

Frizzlife sits on the main line like Flo and does the same basic job: watch the water and close a valve when the pattern looks like a leak. The difference on paper is how it measures. The listing describes ultrasonic flow sensing that registers changes down to 0.01 gallons per minute, about 14 gallons a day, and the LP365-P version shows pressure and flow in the app where the plain LP365 shows temperature. It carries NSF/ANSI 61 and 372 certification, fits both common main sizes with the parts included, and alerts by app, text and phone call. The listing also says it must be plugged in to stay networked and recommends professional installation, so plan for a plumber and an outlet near the main.

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Compare elsewhere

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#2
Best Moen Flo for 3/4 in Mains

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on Amazon ↗

Listing verified 13 Oct 2026

Moen Flo 3/4 in Smart Water Shutoff with 3 Flo Detectors (900-001, 920-005)See it on Amazon ↗

Quick Verdict

Moen Flo 3/4 in Smart Water Shutoff with 3 Flo Detectors: Flo's flow monitoring and daily MicroLeak test plus floor sensors, for 3/4 in mains.

Key Specs

In the box (stated)

One Moen Flo 3/4 in Smart Water Shutoff and three Moen Flo Detectors

Install (stated)

On the main water line

Monitoring (stated)

Flow, pressure and temperature, 24/7

Leak checks (stated)

Daily MicroLeak test; FloSense learns the home's water-use patterns

Shutoff (stated)

Automatic on a detected leak, or from the Moen Flo app anywhere

Detectors (stated)

Wi-Fi moisture sensors for sinks and appliances that also track humidity and temperature

Pros

  • Covers both kinds of leak: unusual flow at the main and water on the floor at a fixture
  • A daily MicroLeak test checks the plumbing for small losses
  • Close the water from the app while you are away
  • Three detectors in the box for the water heater, the washer and a sink

Cons

  • Buyer ratings on the standalone Flo valve listings are mixed, and this bundle's own record is short
  • Main-line install means cutting the supply pipe, a plumber's job
  • Each Wi-Fi detector needs a good signal where it sits

Suited to

Homes with a 3/4 in main that want Moen's flow shutoff plus moisture sensors at the fixtures

Our take

For a 3/4 in main, this bundle is the Flo to buy: the 900-001 valve plus three Flo Detectors. The valve watches flow, pressure and temperature at the main, and its daily MicroLeak test looks for a slow loss of water. The detectors cover the other way a leak shows up, water pooling under a heater or a washer before the flow pattern looks wrong. Moen's listing cites its own device data, saying 60% of new Flo owners find a hidden leak within their first 30 days; that is the maker's figure, not an independent one. The bundle has a short buyer record of its own, and the standalone valve listings are more mixed, so read recent reviews on both before ordering.

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#3
Best Moen Flo for 1 in Mains

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on Amazon ↗

Listing verified 13 Oct 2026

Moen Flo 1 in Smart Water Shutoff with 3 Flo Detectors (900-006, 920-005)See it on Amazon ↗

Quick Verdict

Moen Flo 1 in Smart Water Shutoff with 3 Flo Detectors: the Flo kit for 1 in mains, with smart-home links named on the valve's own listing.

Key Specs

In the box (stated)

One Flo 1 in Smart Water Shutoff and three Moen Flo Detectors

Pipe size (stated)

1 in main

Monitoring (stated)

Flow, pressure and temperature, 24/7, with a daily MicroLeak test

Alerts (stated on the valve's own listing)

App, phone call and email

Smart home (stated on the valve's own listing)

Works with Alarm.com, Ring, Google Assistant and NICE

Install (stated on the valve's own listing)

Everything needed is in the box; professional installation recommended

Pros

  • Sized for a 1 in main, which a 3/4 in valve does not fit
  • Moen's own listing for this valve names app, phone call and email alerts
  • Links to Alarm.com, Ring, Google Assistant and NICE, per Moen's listing for the 1 in valve

Cons

  • Wrong size for a 3/4 in main, so measure at the meter before ordering
  • A short buyer record for the bundle itself
  • The same plumber's install and Wi-Fi needs as the 3/4 in kit

Suited to

Homes with a 1 in main, especially ones with a security panel that Flo can report to

Our take

A Flo valve has to match the pipe it goes into, and this bundle is the 1 in version: the 900-006 valve plus three Flo Detectors. Check the size where the main leaves the meter or the main shutoff; a plumber can confirm it in a minute, and the pipe's outside diameter is easy to mistake for its size. Moen's listing for the 1 in valve sold alone adds details this bundle leaves out: alerts by app, phone call and email, everything needed for installation in the box, and links to Alarm.com, Ring, Google Assistant and NICE, which matters if your home already has a security panel. That listing also says the 900-006 fits 1 to 1-1/4 in pipe and to consult a professional, so let the plumber settle the match.

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#4
Moen Sensors Without a Valve

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on Amazon ↗

Listing verified 13 Oct 2026

Moen Flo Smart Water Leak Detector (920-005, 4 Pack)See it on Amazon ↗

Moen Sensors Without a Valve

Moen Flo Smart Water Leak Detector (920-005, 4 Pack)

5(9 reviews)

Quick Verdict

Moen Flo Smart Water Leak Detector 4 Pack: Moen's floor sensors without the valve, on a thin listing with a very short buyer record.

Key Specs

Model

920-005, four detectors

Placement (stated)

Wherever water damage is a risk, such as a basement that floods, a washing machine or a water heater

Monitoring (stated)

24/7 leak detection

Network

Wi-Fi; Moen's single-detector listing calls for a 2.4 GHz network

Use (per Moen's detector listings)

On their own, or connected to a Flo Shutoff

Remote sensing disc

Not stated on this listing; Moen's 3-pack listing includes an extension cable with a disc reaching up to 48 in

Pros

  • Four sensors for the water heater, washer, dishwasher and a sink
  • Works alone or alongside an existing Flo Shutoff, per Moen's detector listings
  • No plumbing work: each detector sits on the floor where water would collect

Cons

  • Only a handful of buyer ratings on this pack, and Moen's 3-pack listing of the same 920-005 detector has a much more mixed record
  • The detectors alert you; they do not close the water themselves
  • A thin listing with no battery life or alarm volume

Suited to

Adding sensors to a Flo you already own, or Moen alerts at a few fixtures without a main-line install

Our take

Detectors are the half of the Flo system that needs no plumber. Each one sits on the floor where water would collect, under the water heater, behind the washer, beside the dishwasher, and sends an alert to the app when it gets wet. Moen's detector listings say they work alone or connected to a Flo Shutoff, and its bundle listings add that they track humidity and temperature too. This 4-pack listing says little beyond placement and round-the-clock monitoring, and its buyer record is very small. The 3-pack listing of the same 920-005 detector has far more ratings, and they are more mixed, so read those before counting on these. Check the Wi-Fi signal at each spot before you place them.

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Buyer's Guide

What to know before you buy.

What Moen Flo Does, Per Moen's Listings

Moen Flo is a valve with built-in sensors that a plumber fits into the main water line, so all the water for the house passes through it. Per Moen's listings, it watches flow, pressure and temperature around the clock, runs a daily MicroLeak test to look for small losses, and uses what Moen calls FloSense to learn the household's normal pattern so it can flag running water or a small leak. When it sees one, it alerts the Moen Flo app and closes the valve, and you can shut the water from the app while away. Moen's product page adds two needs the Amazon listings leave out: Wi-Fi and a nearby AC power outlet. The valve cannot feel water on a floor; the separate Flo Detectors do that job.

Which Size: 3/4, 1 or 1-1/4 Inch

Moen sells the Flo valve in three listings: the 900-001 for 3/4 in pipe, the 900-006 for 1 in pipe, and the 900-002 for 1-1/4 in pipe, which its listing says is designed for homes with main lines 1-1/2 in or smaller. The 900-006 listing also says it fits 1 to 1-1/4 in pipe and tells buyers to consult a professional, so have a plumber confirm the match. Measure where the main enters the house, near the meter or the main shutoff. Copper and plastic pipe are named by a nominal size that differs from the outside diameter, so a tape measure across the pipe can mislead you. The Frizzlife LP365-P covers 3/4 in and 1 in mains with one unit; for 1-1/4 in, Moen's 900-002 is the only valve among these listings.

Subscription, Warranty and Insurance

None of the Amazon listings on this page mentions a subscription. Moen's product page describes FloProtect as an optional plan that adds a 5-year extended warranty and deductible coverage for water damage that happens with the device installed; without it, Flo carries a one-year limited warranty. Plan terms change, so read the current FloProtect page before counting on either benefit. Insurance discounts are a separate question. Some insurers give one for an automatic water shutoff and some ask for proof of a professional install, so call yours before buying and ask which device types qualify and what paperwork they want. Keep the plumber's invoice and the device's serial number together with your policy papers.

Moen Flo vs Phyn vs Flume, Briefly

These three come up together, but they are not the same kind of device. Flo and Phyn Plus both sit in the main pipe, both can close the water automatically, and both are normally a plumber's install; Flo builds its picture from flow, pressure and temperature plus a daily MicroLeak test, while Phyn reads fast pressure changes in the plumbing. Flume is different: it straps around the water meter with no pipe cutting and reports usage and unusual flow to your phone, but it has no valve, so someone still has to close the main. Neither Phyn nor Flume was among the listings reviewed for this page, so neither appears as a pick. The Frizzlife LP365-P is the closer match to Flo: a main-line valve with flow sensing and automatic shutoff.

How Small a Leak Can a Monitor Catch?

EPA's WaterSense program says the average household's leaks can waste more than 9,300 gallons of water a year, and that a faucet dripping once a second can waste more than 3,000 gallons a year. That faucet works out to about 8 gallons a day. Frizzlife states detection down to 0.01 gallons per minute, about 14 gallons a day, while Moen gives no flow threshold on its Amazon listings and relies on its daily MicroLeak test and learned patterns instead. So the slowest drips sit near the edge of what a flow sensor reports, and a monitor is no substitute for fixing a dripping fixture you can see. You can test your own house first: EPA suggests reading the water meter before and after a two-hour period when no water is used, and says a change of any size probably means a leak.

Who Should Not Buy Moen Flo, and What to Use Instead

Skip a main-line monitor if you rent, since cutting the main is the landlord's decision, or if there is no outlet or Wi-Fi signal near where the pipe enters. Flo also guards only the supply side. A leak in the service line between the meter and the valve, a sewer backup, a failed sump pump, groundwater through a basement wall and a roof leak all happen without unusual flow through the valve, so it cannot stop them. For those, a battery water alarm on the floor or a sump pump alarm does the warning. For automatic shutoff without cutting pipe, a sensor-triggered controller that turns your existing valve is the do-it-yourself route. And if a pipe has already burst, close the main by hand first; a smart valve prevents damage, it does not dry a house.

Frequently Asked Questions

Does Moen Flo require a subscription?

NoAccording to Moen, which describes its FloProtect plan as optional. None of the Amazon listings on this page mentions a subscription.

Moen's product page says the plan adds a 5-year extended warranty and deductible coverage for water damage with the device installed, on top of the standard one-year limited warranty. Plan details change, so check Moen's current terms before you count on them.

Can you install Moen Flo yourself?

You can, but Moen recommends a licensed plumber, and for most homeowners that is the right call. Fitting Flo means shutting off and draining the main, cutting the pipe and making two watertight joints on the line that feeds the whole house, where a weak joint is itself a leak.

Moen's listing for the 1 in valve says everything needed is in the box. Insurers that offer a discount may also ask for a plumber's invoice.

What size Moen Flo do I need?

The size of the main where the valve will go: 3/4 in, 1 in or 1-1/4 in. Moen sells a separate valve for each, the 900-001, 900-006 and 900-002, and the bundles with Flo Detectors come in the same sizes.

Pipe is named by a nominal size rather than its outside diameter, so ask a plumber to confirm it at the meter rather than trusting a tape measure. Frizzlife's LP365-P covers both 3/4 in and 1 in mains.

Does Moen Flo work without Wi-Fi or power?

Moen does not say. Its product page lists Wi-Fi and a nearby AC power outlet as requirements, and none of the Amazon listings describes what the valve does when either drops out.

That matters most for a second home or a house left empty in winter. Ask Moen how the valve behaves offline before you rely on it, and keep a battery leak alarm by the water heater as a backup.

Is Moen Flo worth it?

It can be for a home that sits empty often, has finished space below the plumbing or has had a leak before, because a valve that closes on its own limits how long water runs.

Weigh that against a plumber's install and buyer ratings on the standalone Flo listings that are mixed. For alerts alone, floor sensors take far less effort. If you want automatic shutoff with a stronger buyer record, compare the Frizzlife LP365-P.

Does Moen Flo shut off water automatically?

YesMoen's listings say Flo closes the valve when its monitoring or daily MicroLeak test finds a problem, then alerts the app, and you can also close it remotely.

The Flo Detectors are listed as moisture sensors that alert you; the listings do not say whether a wet detector can close the Flo valve, so ask Moen how the two work together before relying on that. A manual main shutoff you can reach quickly is still worth knowing.

Who do I call right now for water damage?

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. A recorded menu picks up first: choose water damage or mold, key in your 5-digit ZIP code, and hold through the short silence while the call is passed to the company.

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

Sources

  1. EPA WaterSense — Fix a Leak Week

Methodology: How we source and verify data · Report an error

How we chose these picks

  • Every pick is a current listing. Stock, star ratings and rating counts are read from Amazon by script and carry the date they were read.
  • Nothing under 4.0 stars makes the list, and the top pick needs a large rating count, so one good week of reviews cannot put it there.
  • Specs are quoted from the listing or the maker, with the test condition behind the number where there is one, and sized against the job rather than the room on the box.
  • Each comparison is reviewed by Marcus Reed, an IICRC-certified Water Restoration Technician, against the IICRC drying standards and public guidance listed under Sources.

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