Moen Flo Smart Water Monitor and Shutoff

Quick verdict

The Moen Flo is the most comprehensive whole-home water protection system available. It monitors pressure, flow, and temperature, runs daily health tests, and can automatically shut off your water when it detects a leak. The trade-offs are significant: the Home Assistant path is cloud-only, plus a main-line plumbing install and premium pricing. Its Local Mode does keep leak detection and automatic shutoff working with no internet at all, which matters for a device whose job is damage prevention. But if preventing water damage is the goal, nothing else comes close.

Standout: Whole-home water monitoring with automatic shutoff and daily plumbing health tests that can detect micro-leaks before they become disasters.

Notes last checked May 31, 2026.

Compatibility snapshot

Why it stands out

• monitors whole-home water pressure, flow rate, and temperature to detect leaks before they cause damage
• automatic shutoff can close the valve when a leak is detected, potentially saving thousands in water damage
• daily health tests check your plumbing system integrity automatically

Reasons to hesitate

• no local API for Home Assistant - the official integration is cloud polling, so HA control and alerts stop if Moen's cloud is unreachable
• it installs directly on your main water line, which for most homes means hiring a plumber
• premium price point plus the cost of professional installation

Best for

• homeowners worried about catastrophic water leaks or burst pipes while away
• anyone with a history of plumbing problems who wants automatic shutoff protection

Avoid if

• you need Home Assistant to control the valve locally - HA reaches it only through Moen's cloud
• you are not prepared for plumbing work on your main water line

Privacy and local-control notes

Day-to-day usage data, analytics, alerts and remote valve control all go through Moen's servers, and the Home Assistant integration is cloud polling. The valve itself is not helpless offline: Moen's Local Mode runs leak detection and automatic shutoff entirely on-device, needing only pressurized pipes and AC power, and even in normal mode the unit can still close on a catastrophic leak while disconnected.

Home Assistant support: supported · integration path: flo (official core integration, cloud polling).

Buying reality check

Price notes: Sold by pipe size. The 3/4 inch model (900-001) linked here read $559.00 on Amazon, verified 2026-09-02; the 1-1/4 inch model (900-002) read $999.99 the same day, so check your main's diameter before ordering. Professional plumbing installation typically adds $200-400 on top. No subscription is required for core monitoring and shutoff.

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