Ring Alarm Flood & Freeze Sensor (Z-Wave)

Compiled by SmartHomeWorkflow Research · Ring · Water Protection & Plumbing · ~$35 ($34.99 still rendering on ring.com at time of research — but the page has no add-to-cart control, so this is a displayed price for a product that cannot be bought from Ring, not a live price.)

Present function is not in doubt; the SUPPORT HORIZON is. Ring has made no statement about whether existing Z-Wave flood sensors keep working after the transition to the Sidewalk line, which was the highest-value open question for existing owners and could not be answered. The only signal found is a journalist's characterisation (PCWorld) that the new sensors 'can coexist with Ring's older devices that operate on a Z-Wave mesh network' — that implies continuity but is not a Ring support commitment and says nothing about duration. Existing owners are documented neither as cut off nor as safe. You are buying a $34.99 sensor that is inert without a base station costing several hundred, silent on your phone without a subscription, and no longer sold by Ring. Without a plan, a leak that starts while you are out triggers a siren nobody hears and sends you nothing. The one feature that turns detection into prevention — Auto Close, which shuts a compatible Z-Wave valve automatically — is also subscription-gated and works only with Ring-approved valves. And the replacement may not carry that feature forward: Ring's successor is an Amazon Sidewalk sensor that explicitly does not use a base station, while Auto Close depends on a Z-Wave valve joined to that base station's network, and no source confirms or denies whether the new sensor can close a valve at all. A buyer replacing a dead sensor with the current one may quietly lose automatic shutoff.

Compatibility

Ecosystem	Support	The catch
Amazon Alexa	Not checkedWe have not verified this yet — this is not a claim about the product	Notable given both are Amazon, and genuinely unresolved. Ring Alarm as a system integrates with Alexa, but multiple Ring Community threads report that this specific sensor does not appear in the Alexa app as a routine trigger — one user describes it as the only sensor that does not show up. No Ring or Amazon staff confirmation was found in either direction, so this is recorded as unknown rather than published as a negative on user reports alone. If accurate, it means a flood event cannot drive arbitrary third-party devices through Alexa.
Google Home	Not checkedWe have not verified this yet — this is not a claim about the product	No statement from Ring or Google covering Ring ALARM SENSORS was found in either direction. Secondary sources describe Google Home working with Ring cameras and doorbells only, which is not the same claim and is not a basis for a negative on this device.
Apple Home	Not checkedWe have not verified this yet — this is not a claim about the product	No native HomeKit support is documented by Ring or Apple. Homebridge, a third-party community project, reportedly exposes Ring alarm accessories including water sensors — an unofficial path that depends on Ring's private API and can break without notice. Recorded as unknown rather than none because no vendor statement addresses it.
SmartThings	Not checkedWe have not verified this yet — this is not a claim about the product	SmartThings Community reports indicate Ring Alarm is not supported while cameras partially are, but no authoritative SmartThings documentation was located, so this rests on community forum posts rather than a counterparty statement.
Home Assistant	Not checkedWe have not verified this yet — this is not a claim about the product	The official Home Assistant Ring integration surfaces cameras rather than Ring Alarm devices. Two community projects claim coverage — a custom component advertising Flood/Freeze support, and ring-mqtt, which covers Ring Alarm — but both ride Ring's private API and their current maintenance status was not verified. Not publishable as working without checking commit recency.

? Not checked means we haven’t verified that ecosystem yet — it is a statement about our research, never a verdict on the product. A Setup Check can research it for you.

Protocols: ZWAVE

Needs before it works: A Ring Alarm or Ring Alarm Pro base station is mandatory — the sensor is inert without one, and Ring states it in two places, including 'The Flood & Freeze Sensor requires the Ring Alarm Base Station to send notifications in case of a flooding or freezing event.' Z-Wave range to the base station is up to 250 ft, and range extenders are supported.

Subscription reality

⚠ Works without a subscription: No — core features are paywalled.

Free: Base station siren sounds on a flood or freeze event, An audible chirp or spoken alert at the base station, Arm and disarm from the physical keypad only
Behind a plan: Push and email alerts when water or freezing temperatures are detected, Auto Close — automatically closing a compatible Z-Wave water valve, Optional automated calls from the monitoring centre for flood and freeze events (from $4.99/mo)
Estimated 5-year subscription cost: ~$299 at $4.99/mo — price verified 2026-07-19

Recorded as required rather than optional because for a leak sensor, being told is the product. Ring's own words for unsubscribed users are that the siren sounds but 'you and your Shared Users will not receive digital notifications' — so a leak that starts while you are at work produces a noise in an empty house and nothing on your phone. Ring's product page states alerts are 'subscription required, sold separately'. CURRENT TIER NAMES AND PRICES (Ring renamed its plans on 2026-01-14, so older reviews cite 'Ring Protect'): Ring Solo $4.99/mo or $49.99/yr, Ring Multi $9.99/mo or $99.99/yr, Ring Pro $19.99/mo or $199.99/yr including 24/7 professional monitoring, plus a $99/mo Virtual Security Guard add-on. Pricing recorded here is the entry tier. UNRESOLVED: Ring never names which tier unlocks basic flood and freeze alerts — four separate Ring support pages say only 'compatible Ring subscription' — so do not assume the cheapest tier suffices. A counterparty source (Zooz's support knowledge base) names 'Ring Protect Basic' for Auto Close, which maps to today's Solo tier, but that is pre-rename naming and may be stale.

Maintenance reality

Batteries: 3V lithium CR123A, non-rechargeable, included — expect roughly 36 months per set
Cloud dependence: Yes — a server shutdown would degrade or brick this device
Local annunciation survives a cloud or subscription lapse; remote awareness does not. The sensor can send an audible chirp or spoken alert to the base station, and the base station siren works with no subscription — but notifications, monitoring and Auto Close all route through Ring's service. Triggers on water contact or a temperature below 40 °F, and that threshold is not user-adjustable in the app. Operating range 32–120 °F. Battery life is Ring's 'up to 3 years' figure.

Who it's for

Existing Ring Alarm owners who already pay for a plan and can still find stock — for them this was a cheap, sensible add-on, particularly paired with a compatible Z-Wave valve for genuine automatic shutoff. It is a poor choice for anyone buying into Ring solely for leak detection, anyone unwilling to subscribe, anyone who wants local control or Home Assistant integration, and, given that Ring no longer sells it, anyone starting a new installation today. Those buyers should look at Ring's Sidewalk successor with the open questions below in hand, or at another ecosystem entirely.

Sources & method

ring.com/products/alarm-flood-and-freeze-sensor re-checked directly 2026-07-19: no add-to-cart control, showing 'Enter your email below to be notified when this product is available' and 'Thanks for signing up. You will be notified when the product launches.' shop.ring.com returned no availability string or cart control either way and was inconclusive. The 'discontinued' store string quoted by piunikaweb (2025-12-09) did not appear in our fetch — recorded as the difference between verified-unavailable and reported-discontinued. — vendor-page research (cart-state check), verified 2026-07-19 · Two Ring sources. Support article ndn0k: 'The Flood & Freeze Sensor requires the Ring Alarm Base Station to send notifications in case of a flooding or freezing event.' Product page: 'Requires Ring Alarm or Ring Alarm Pro Security Kit'. — vendor-support and vendor-page research, verified 2026-07-19 · Ring FAQ 95zzm carries the footnote 'Compatible Ring subscription required'; the product page says alerts are 'subscription required, sold separately'; support article 47t1b gives the unsubscribed behaviour — the siren sounds, but 'you and your Shared Users will not receive digital notifications' and arming is 'from the Ring Keypad only'. ring.com/plans gives Solo $4.99/$49.99, Multi $9.99/$99.99, Pro $19.99/$199.99 and Virtual Security Guard $99/mo. ring.com/support/plans/standard states 'Ring Home plans were renamed Ring Protect plans on January 14, 2026'. UNRESOLVED ACROSS FOUR RING PAGES (lw54x, 47t1b, 95zzm, ndn0k): which tier unlocks basic flood and freeze alerts — Ring only ever says 'compatible'. A secondary blog claiming a February 2026 price increase was checked against ring.com/plans and rejected. — vendor-support and vendor-page research, verified 2026-07-19 · Ring support article 3854k names the Zooz Titan Water Valve Actuator as 'the first Z-Wave water valve to be added to the list of Works With Ring devices' and describes Auto Close, '(Ring subscription required)', closing the valve automatically on a flood or freeze event detected by the Flood & Freeze Sensor. Ring article ap9ay lists Works With Ring manufacturers (Dome, EcoLink, First Alert, GE, Kidde, Leviton, Zooz) including water valve actuators, and states 'All Works with Ring products require a Ring Alarm Base Station.' Zooz's own support knowledge base adds the sharper limit — Auto Close 'will only work with Ring Flood & Freeze Sensors, which are the only leak sensors currently fully integrated in the Ring Alarm system' — and names 'Ring Protect Basic' as the required tier; that page 403'd on direct fetch and the text came from a search excerpt, so it is flagged as unconfirmed at source despite carrying two load-bearing facts. — vendor-support and counterparty-source research, verified 2026-07-19 · Ring announced a Sidewalk-based Flood & Freeze Sensor (B0DS6HSS9Z) at CES January 2026, shipping March 2026, 2×AA included rated up to 6 years, no base station required, about $39.99 US (press coverage; a Canadian Ring page verified $29.99 CAD reduced from $39.99 with a live add-to-cart). CRITICAL UNRESOLVED QUESTION: no source, Ring or Zooz, confirms or denies whether the Sidewalk sensor supports Auto Close. Architecturally it is doubtful — a Sidewalk sensor has no documented route to a Z-Wave valve joined to a base station the buyer may not own — but that is reasoning, not evidence, and it is recorded as an open risk rather than a finding. ALSO NOTE: Ring's 'no sign up fees or subscriptions to connect' line on the new sensor refers to SIDEWALK CONNECTIVITY, not to alerts, and must not be read as alerts being free; whether alerts are gated on the successor is unknown. Ring's own monitoring-eligibility list for the new line omits the Flood & Freeze Sensor, which is suggestive but not an affirmative statement. — vendor-page and counterparty research, verified 2026-07-19 · Ring support article b4lyi lists Amazon Sidewalk bridges (Echo 4th Gen, Echo Show 10/15/21, Echo Hub, Ring Bridge 2nd Gen, Ring Alarm Pro, several Floodlight/Spotlight/Outdoor cameras and the Wired Doorbell Pro) and states a bridge is not strictly mandatory — 'If your neighborhood already has good Amazon Sidewalk coverage, you only need the compatible device', while 'Having a bridge ensures a stronger connection.' So the buyer needs either a Sidewalk gateway they own or sufficient neighbour-provided coverage. RING PUBLISHES THREE DIFFERENT COVERAGE FIGURES ON THREE OF ITS OWN PAGES: approximately 95% (ring.com/ring-sensors), approximately 70% (ring.com/ca) and 90% (article b4lyi). The discrepancy is recorded rather than resolved into one number. — vendor-support research, verified 2026-07-19 · Ring product page (Z-Wave, up to 250 ft to the base station, 3V lithium up to 3 years, 2.95in × 1.06in, 32–120 °F) and support article ndn0k (CR123A; triggers below 40 °F, not adjustable in the app) — vendor-page and vendor-support research, verified 2026-07-19 · Ring support article ndn0k — with an eligible subscription and enrolment in Flood & Freeze Monitoring, you 'can now optionally receive an automatic call from the monitoring center'; article o80oz describes the primary contact being called, then the secondary. Coverage is all 50 US states excluding territories, and Canada excluding Quebec. Worth stating plainly because buyers likely assume parity with intrusion monitoring: intrusion escalates to emergency DISPATCH, while a water event produces an automated phone call — no source describes responder dispatch for a water event. — vendor-support research, verified 2026-07-19 · Deliberate and uniform: no vendor or counterparty statement was located establishing support or non-support for this specific sensor in any of the five ecosystems. Alexa rests on Ring Community user reports with no staff confirmation; Google on secondary sources describing cameras rather than alarm sensors; Apple on the absence of documentation plus an unofficial Homebridge path; SmartThings on community forum posts; Home Assistant on the official integration covering cameras plus two unverified community projects. Publishing any of these as 'none' would be inferring a negative from absence. — counterparty-source research, verified 2026-07-19 · 4SF1S8-0EN0 appears in a Home Depot listing title; the page returned HTTP 403 to direct fetch and the model number is not confirmed on any Ring page. Recorded because it is the only model identifier found, but it is the least-sourced field on this record. — retailer-listing title only, verified 2026-07-19 · Secondary analysis indicating no Ring device is Matter-certified as of 2026 and that Ring Alarm Pro cannot act as a Matter controller. This was NOT checked against the csa-iot.org certification database directly, so it is recorded at medium confidence as secondary rather than as a registry-verified absence. — secondary-source research, verified 2026-07-19. 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. 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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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