Refurbished Household Sensors & Alarms — 44 Deals

44 open-box and refurbished Household Sensors & Alarms deals are live for shoppers in the US right now, with discounts averaging 22% off retail. Prices range from $8 to $938, and every listing shows the seller's condition grade, current price, savings versus list price and stock status — so you can compare before you buy. Top brands on sale include Moen, TOPTES, YoLink and EG. Inventory syncs from Amazon and other partner stores throughout the day; open-box stock is usually one-of-a-kind, so the best deals sell out fast.

44 live US listings.

USA

BW Technologies

BW Technologies XT-XWHM-Y-NA GasAlertMax XT II 4-Gas Detector with Pump, Combustible, O2, H2S and CO, Yellow by BW Technologies

$760⁵⁶

Moen Flo 3/4-inch Smart Water Shut Off Valve, Smart Home Water Monitor Leak Detector, Wifi Connected, App Enabled Flow Meter and Shutoff, 900-001

$406⁹⁰

Moen Flo 1-inch Smart Water Shut Off Valve, Smart Home Water Monitor Leak Detector, Wifi Connected, App Enabled Flow Meter and Shutoff, 900-006

$480⁰⁰

SJE-Rhombus Tank Alert XT - Indoor/Outdoor Tank Alarm with Auto Reset

$89⁹⁴

Air Quality Monitor, Formaldehyde Detector, Temperature & Humidity Meter, Pollution Tester, Sensor; Detect PM2.5/PM10/PM1.0 Micron Dust, Test Indoor TVOC Volatile Organic Compound Gas; eBook

$80²⁶

Moen Flo 1-1/4-inch Smart Water Shut Off Valve, Smart Home Water Monitor Leak Detector, Wifi Connected, App Enabled Flow Meter and Shutoff, 900-002

$937¹⁷

RIDGID 36163 CD-100 Micro Combustible Gas Handheld Diagnostic Detector with 16" Flexible Probe and Visual, Audible, and Vibration Alarms

Used – Mint

$197⁹¹

$257.28

-24% Save $59.37

Update: 9 hours 21 mins

Buy at Amazon.com

USA

Phyn

Plus Smart Water Assistant & Shutoff (2nd Gen)

$533⁵⁹

Zoeller 771302 APak Control Enabled Indoor Alarm System with Reed Sensor

$99⁹⁹

LUCKYDUO WiFi Sump Pump Alarm, Built-in Backup Battery, High/Low

Used – Acceptable

$49¹³

$89.99

-46% Save $40.86

Update: 6 hours 31 mins

Buy at Amazon.com

USA

Watts

Watts A2C-SC Series Intelliflow 1/2" Washing Machine Smart Water Shutoff Valve with Leak Sensor, Inlet Adapters, Without Wall Box, Automated Flood Detection with Real-Time Text and E-Mail Alerts

$300⁴⁷

NSF Certified YoLink FlowSmart All-in-One Smart Water Meter & Auto Shutoff for ¾″ Pipes, LoRa Long-Range, Real-Time Leak Detection, 10-Year Battery, 80+ Device Ecosystem, Hub Included – YS5018

Used – Mint

$213³¹

$249.99

-15% Save $36.68

Update: 3 hours 50 mins

Buy at Amazon.com

USA

Moen

Moen White Flo Smart Water Leak Detector, Water Sensor Alarm for Home, 3-Pack, 920-005

$111⁸⁸

Klein Tools ET120 Gas Leak Detector, Combustible Gas Leak Tester with 18-Inch Gooseneck Has Range 50-10,000 ppm, Includes Pouch, Batteries

$102⁸⁹

TACO LB-075-H-2LF LeakBreaker 3/4"" NPT Water Heater Shut-Off Valve & Actuator

$149³⁹

AEGTEST HOUND-3786 Radon Detector for Home, 10-Min Update, 3.5" Large Display, Long-Term Radon Monitoring with Data Charts, PDF Export, Audible & Visual Alarm, pCi/L & Bq/m³ -Black

$74⁹⁹

Resideo RCHW3610WF1001/N Wi-Fi Water Leak Detector, 1.2, White

$84⁰⁰

X-Sense Wi-Fi Water Leak Detector for Home - Smart 2-in-1 Leak & Low-Temperature Sensor with App Alerts, Protection for Homes, Kitchens & Basements, Model SWS0B, 3 Packs

$29¹⁴

FNIRSI GD-02 Natural Gas Detector, Methane, Propane & Isobutane with 14-Inch Flexible Gooseneck, Combustible Gas Detector for Audible, Visual & Tactile Triple Alarm, Rechargeable Battery

$39⁷⁹

FloodStop Water Heater Motorized Ball Valve, 3/4" Compression

$102⁸⁶

Airthings 325 Corentium Home 2 Smart Digital Radon Detector - Portable and Easy-to-use Radon Testing with Bluetooth connectivity and Humidity & Temperature Sensors

Used – Mint

$164⁰¹

$179.99

-9% Save $15.98

Update: 20 hours 20 mins

Buy at Amazon.com

USA

Moen

Moen Flo Smart Water Leak Detector, Drip or Flood Sensor Alarm for Home, 1-Pack, White, 920-004

$39⁴⁷

Honeywell Home RWD42/A Water Defense Water Leak Alarm with Sensing Cable, Rwd42 , White

$17⁷¹

empowerDX Express Radon Test Kit, All Fees Included, EPA Listed, NPPR Certified, Check Radon Gas Levels in Your Home, Same Day Results, FedEx Return Included

Used – VeryGood

$27⁰²

$39.95

-33% Save $12.93

Update: 11 hours 58 mins

Buy at Amazon.com

Household Sensors & Alarms open-box FAQ

How much can I save on open-box Household Sensors & Alarms?

Discounts on Household Sensors & Alarms at OpenBoxFox currently average 22% off retail across 44 live listings, with prices from $8 to $938. Savings are measured against the manufacturer's list price.

Are open-box and refurbished Household Sensors & Alarms safe to buy?

Yes — every listing shows the seller's condition grade (from open-box "Like New" to certified refurbished) before you buy. You purchase directly from the seller, such as Amazon, and that seller's standard return policy applies to your order.

Which Household Sensors & Alarms brands are on sale open-box right now?

The most-listed brands in Household Sensors & Alarms at the moment are Moen, TOPTES, YoLink, EG and AEGTEST. New open-box inventory arrives daily, so brand availability changes often.

How often are Household Sensors & Alarms deals updated?

OpenBoxFox syncs Household Sensors & Alarms inventory from partner stores throughout the day. Sold-out listings are removed automatically and new deals appear shortly after we find them.