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Resideo RWD21 Reusable Water Leak Alarm

4.4 4.4 out of 5 stars 2,295 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Water Detectors & Alarms by Honeywell

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Purchase options and add-ons

Color White
Brand Honeywell
Power Source Battery Powered
Product Dimensions 3.25"L x 3.25"W x 1.13"H
Number of Batteries 1 9V batteries required.

About this item

  • Unlimited use spot detector
  • Economical way to defend against water leaks in multiple locations throughout the home
  • Water sensor and alarm in one
  • Audible alert when water is detected
  • Detects water only 1/16" deep
See more product details

Customer ratings by feature

Battery life
4.7 4.7
Easy to install
4.5 4.5
Value for money
4.0 4.0
Easy to use
4.0 4.0

Frequently bought together

$12.05
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Resideo RWD21 Reusable Water Leak Alarm
Honeywell Resideo RWD21 Reusable Water Leak Alarm
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Price$12.05-12% $26.99
List:$30.59
$14.99-50% $29.99
List:$59.99
$89.99$49.99
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Battery life
4.7
5.0
4.6
4.7
4.8
Tech Support
3.5
5.0
4.6
4.6
5.0
Easy to install
4.5
5.0
4.8
4.6
Value for money
4.0
5.0
4.6
4.6
Easy to use
4.0
4.8
4.6
Sold By
Amazon.com
Povlen Direct
Amazon.com
GoveeLife US Direct
GoveeLife US Direct
X-Sense US

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Resideo RWD21 Reusable Water Leak Alarm


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From the manufacturer

RWD21 Resideo Reusable Water Leak Alarm

Defend against water damage

Help protect the things — and people — that matter most from leaks and water damage. Place a Water Leak Alarm near the usual suspects — water heaters, sinks, bathrooms — to help stay ahead of water leaks.

Resideo Water Leak Alarm
RWD21 Dimensions

Actual Size

3.25"W x 3.25"H x 1.125"D (in.)

Find the Water Leak Detector for You

RWD21 Reusable Water Leak Alarm

Reusable Detector

Resideo Wi-Fi Water Leak Detector

Wi-Fi Detector with Cable

RWD42 water sensor and cable

Reusable Detector w/Cable

RWD11 Single Use Water Leak Alarm

Single-Use Detector

Customer Reviews
4.4 out of 5 stars
2,295
4.2 out of 5 stars
1,330
4.0 out of 5 stars
100
4.5 out of 5 stars
311
Wi-Fi Compatibility
Add-On Cable Extensions
Reusable After Detection
Replaceable Batteries
Detects water 1/16 inch deep
Number of Detectors
1 1 + Cable 1 + Cable 4

Looking for specific info?

Product Description

Product Description

Help protect the things — and people — that matter most from leaks and water damage. Place a Water Leak Alarm near the usual suspects — water heaters, sinks, bathrooms — to help stay ahead of water leaks. This water sensor and alarm can detect water only 1/16" deep. Upon sensing a potential leak, the alarm will sound for up to 24 hours (depending on battery life) on a volume of 85db so you will be alerted before a leak can become a costly problem.

Amazon.com






Re-Useable Water Leak Alarm — RWD21

• Sensor and alarm all-in-one
• Loud audible alarm
• Economical way to defend against water leaks

Never be surprised by a leak or flood again! The Honeywell RWD21 Single Use Water Leak Alarm automatically goes off when water comes into contact with it allowing you to respond to leaks and floods quickly and prevent disastrous damage caused by unknown water exposure. Great for placing around water prone areas such as sump pumps, water tanks, burst prone pipes, or even under the sink. Honeywell's water defense system and water-sensing alarm offers superior protection against leaks and water damage in your home and office. Add peace of mind with a water leak alarm.

Features:
  • Unlimited use spot detector; easily re-sets for re-use
  • Easy to use near water heaters, sump pumps, under sinks, dishwashwers
  • Water sensor and alarm all in one
  • Economical way to defend against water leaks in multiple locations throughout the home
  • Loud audible alarm
  • Alarm sounds for up to 24 hours (dependent upon battery life)
  • Low battery chirp
  • Requires 9V battery (sold separately)

Customer reviews

4.4 out of 5 stars
4.4 out of 5
2,295 global ratings

Customers say

Customers like the ease of installation of the alarm. For example, they mention it's simple and easy to screw in all the way. That said, some are happy with size and value. That being said, opinions are mixed on quality, battery, performance, leak detection, and sound.

AI-generated from the text of customer reviews

69 customers mention54 positive15 negative

Customers like the value of the alarm. They say it's easy worth the cost, cheap, and an inexpensive insurance policy. Some customers also mention that it saves them money and headaches.

"Unit works as designed. Were pleased with its capabilities and price." Read more

"...These are inexpensive insurance that might save hundreds or thousands of dollars in repairs. Been there..." Read more

"...Small, super simple and affordable. We have one under anything that can leak...." Read more

"pretty basic but it works great. I setup a govee smart sensor and this Honeywell sensor. Honeywell worked one night and govee did not!" Read more

45 customers mention40 positive5 negative

Customers like the ease of installation of the alarm. They say it's easy to install, use, and screw in all the way. They also mention that it takes seconds to set and test.

"...It is easy to screw in all the way if you use a quarter in the slot to turn the base cover...." Read more

"This has alerted us a few times already and are so great. Small, super simple and affordable. We have one under anything that can leak...." Read more

"Reliable and easy. Bought four of them. Will need to purchase another two as well...." Read more

"Easy to set up. I purchased this after installing an under sink water filtration unit for added security...." Read more

28 customers mention21 positive7 negative

Customers like the size of the alarm. They say it is small enough not to be an issue and loud enough to hear. They also say it takes up little space and provides a much greater peace of mind. Customers also mention that it fits easily into tight places and has a nice compact construction. Overall, customers are satisfied with the size and portability of the product.

"The product is great, just what you would expect from Honeywell. Small, simple, and with a low battery warning like a smoke detector...." Read more

"This has alerted us a few times already and are so great. Small, super simple and affordable. We have one under anything that can leak...." Read more

"I hate when things dont have batteries come with it, also little big for tight places, but should work okay for my use" Read more

"...This compact alarm uses a 9-volt battery and is about the size of a small tuna can, and is completely portable...." Read more

150 customers mention100 positive50 negative

Customers are mixed about the performance of the alarm. Some mention that it works well, is useful, and is still working strong, while others say that it stopped working after about six years.

"Unit works as designed. Were pleased with its capabilities and price." Read more

"The product is great, just what you would expect from Honeywell. Small, simple, and with a low battery warning like a smoke detector...." Read more

"...Basically this renders it pretty useless for most applications where water may exceed 1/4 of an inch at a moderate pace...." Read more

"...One of them appears to continue to work fine, but the other one chirped every 30 seconds (which is stated as the low battery signal), even after..." Read more

104 customers mention43 positive61 negative

Customers are mixed about the sound of the alarm. Some mention it works perfect and is loud, while others say that the noise it makes is not very loud, the siren is low volume, and the alarm is not loud enough. Some say that it is hard to hear on the main floor and that it makes noise when it gets wet.

"...The alarm isn't super loud but is fine for me...." Read more

"...It will detect even the slightest water and is loud...." Read more

"Works but is not loud enough depending on how far away you need to put it." Read more

"...Buzzer is loud enough to hear anywhere in the house.4>Buzzer chirp when battery is low.5>Cheap.6>Small but not to small...." Read more

82 customers mention42 positive40 negative

Customers are mixed about the quality of the alarm. Some mention it's reliable, well built, and a good alarm. However, others say that it alarms intermittently for no reason, emits an ear-splitting alarm when wet, and starts constantly beeping after less than a month.

"...Rainproof/waterproof and will float and continue to alarm in rising water: - has a rubber o-ring on battery compartment door and a..." Read more

"...They emit an ear-splitting alarm when wet all the way through submersion...." Read more

"Reliable and easy. Bought four of them. Will need to purchase another two as well...." Read more

"...It is a great idea, must be a very poor design." Read more

52 customers mention35 positive17 negative

Customers are mixed about the leak detection of the alarm. Some mention it's an effective solution to detect early water leaks that can rack up thousands of dollars in bills. They say it has helped save them from several types of leaks. Some say that it'll alarm with very little moisture, while others say it detected a leak in the tub under the sink.

"...It will detect even the slightest water and is loud...." Read more

"Pros:1>Rainproof/waterproof and will float and continue to alarm in rising water: - has a..." Read more

"...upstairs after returning from the grocery store, my other water heater had started leaking!..." Read more

"...The Honeywell Water Damage Prevention Alarm is perfect!..." Read more

22 customers mention8 positive14 negative

Customers are mixed about the battery of the alarm. Some mention that it was still good after 4.5 months, has a low battery warning, and has very low battery consumption. However, others say that the unit beeps constantly, indicating the battery is low.

"...be user error, but on two of my three alarms, I cannot get the 'low battery' to stop chirping - even with brand new Amazon 9v batteries...." Read more

"...Small, simple, and with a low battery warning like a smoke detector...." Read more

"...These have a low battery chirp, so if you can't find a smoke alarm with a low battery, don't forget to check under your sink!" Read more

"...Water damage is expensive. These are reasonably priced." Read more

Waterproof and will float - excellent design.
5 Stars
Waterproof and will float - excellent design.
Pros:1>Rainproof/waterproof and will float and continue to alarm in rising water: - has a rubber o-ring on battery compartment door and a screwdown mechanism to ensure a good seal. - has a rubber o-ring on top cover. - buzzer hole on top does not seem to allow water penetartion into compartment - I disassembled it after it went for a swim.2>Honeywell is a trusted American company with real engineering going into the design.3>Buzzer is loud enough to hear anywhere in the house.4>Buzzer chirp when battery is low.5>Cheap.6>Small but not to small.7>Won't tip over.8>Wont crush if stood on.Cons:1>None yet.I have only had one of these running for a couple of months so can't report on battery life but being a trusted brand I have high hopes for excellent battey life.
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Top reviews from other countries

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Ricardo M. A
5.0 out of 5 stars Simples e Funciona
Reviewed in Brazil on December 14, 2023
C.Man
5.0 out of 5 stars Better safe than sorry
Reviewed in Canada on October 7, 2023
hcastro
5.0 out of 5 stars buen articulo. cumple con su función
Reviewed in Mexico on November 1, 2022
Harry C
5.0 out of 5 stars Reliable protection against water leaks
Reviewed in Canada on September 25, 2022
3 people found this helpful
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wendel
1.0 out of 5 stars Me arrependi da compra
Reviewed in Brazil on September 9, 2022