Product Library / Water Protection & Plumbing

Phyn Plus Smart Water Assistant + Shutoff (2nd Gen)

Compiled by SmartHomeWorkflow Research · Phyn · Water Protection & Plumbing · ~$579.99 ($579.99 direct from phyn.com, re-read 2026-08-13: in stock, with no crossed-out original price, so this is the list price rather than a promotion. Unchanged since the 2026-07-19 reading. Worth noting the drift against launch: the 2nd gen launched at $499 in November 2021, so the street price still sits above where it started, and the 1st gen launched in 2018 at $850. The $539.98 Home Depot figure recorded in July was NOT re-checked and should be read as a July observation. Amazon, Lowe's and Best Buy all block automated readers, which is not evidence that the product is unavailable there. Never treated as a live price.)

Compatibility

? Inconclusive means we researched that ecosystem and the evidence doesn’t settle it — the catch says why, and the sources are listed below. It is a statement about the available evidence, never a verdict on the product. A Setup Check researches your exact setup where the official sources don’t answer.

Protocols: WIFI^[13][23]

What it can do^[25]

Listed capabilities are what we could establish from vendor documentation. An ability missing here is unestablished — not necessarily absent.

Subscription reality^[2][18]

✓ Works without a subscription: Yes.

Vendor account required: Not established — we have not sourced this yet.

Unusually, this is an AFFIRMATIVE vendor claim rather than an absence argument. Phyn states 'No subscription fees. At Phyn, we believe that your data is yours. We don't charge you a fee to access your water use data' and 'We think you shouldn't have to pay a monthly subscription to help save our water.' The app carries no in-app purchases, and the auto-shutoff help article documents the feature end to end with no fee or plan language anywhere. No plan names, tiers or prices exist on phyn.com, the help centre or either app store. One precision caveat: the verbatim no-subscription clause is scoped in its own explanatory sentence to DATA ACCESS — but nothing anywhere gates shutoff, and there is no plan structure with which to gate it.

Maintenance reality^[1][20]

• Works without the internet: Inconclusive — we read the vendor's own material and it does not answer this either way. It does not mean the product fails without the internet.
• Mains powered from a standard outlet, not hardwired, and the outlet must be close — Phyn's product page says within 12 ft while its help centre says 11 ft, so plan for the conservative figure. BACKUP BATTERY: Phyn is silent, and published third-party testing states there is none; recorded as unestablished rather than asserted, because the vendor never says so. On a power cut the valve holds whatever position it was in, and a manual shutoff tool is provided on the mounting bracket. The unmitigated risk is that no battery means a power outage disables protection entirely, and outages correlate with exactly the freeze and storm events that burst pipes. Rated 125 psi, 25 GPM, max 50 °C, with under 7 psi pressure drop at full flow; fits mains up to 1¼ inch via 1 inch NPSM male threads, adapters not included. Plumbing Check closes the main on its own overnight schedule for 3–5 minutes (extended runs 10–13) and alerts on a 4 psi drop over 3 minutes. No consumables or maintenance article was located — recorded as unestablished, not as 'none'.
• Security updates: No security-update support date is on record for this model yet. We haven't yet checked whether Phyn publishes one, so this is a gap in our research — not a statement about the manufacturer.

The catch

The price is not the cost, and the protection has gaps you would not guess. Add unquoted licensed-plumber labour to cut into your main, possible thread adapters that are not included, and an outlet within about eleven feet. There is no battery backup, so a power cut disables protection entirely and freezes the valve where it stands — during exactly the storms that burst pipes. Auto-shutoff is disabled by default for up to 21 days while the system learns your home, and published testing reports false alarms clustering in those first weeks. It only sees plumbing downstream of itself, so irrigation teed off ahead of it, outbuildings and split service lines are invisible. And third-party leak sensors are second-class citizens: Phyn's own pucks trigger the valve natively in-app, while everything else goes through IFTTT polling or an unofficial component.

Who it's for

Homeowners with an accessible main, a nearby outlet and a willingness to pay a plumber, who want whole-home leak detection without scattering point sensors, and who value the absence of a subscription — over five to ten years that is a real cost advantage against subscription-tied competitors. It fits Alexa and Google households, and Home Assistant users comfortable running a community integration. It is a poor fit for Apple Home households, SmartThings-centric setups, renters, homes on well or non-potable supply, homes with branch plumbing ahead of the install point, and anyone unwilling to add a UPS to cover the power-outage gap.

Sources & method

Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →

Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.

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