Water Leak Sensors · Head to head

Shelly Flood vs Tapo T300

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Shelly and TP-Link sites.
2026 verdict
Shelly or Tapo for a leak sensor? The Tapo T300 comes out ahead, mainly for its own siren and a battery rated to last twice as long.
Tapo T300
Winner
Tapo T300
$19.99

Last recorded price

Buy on Amazon USA
It sounds an alarm and flashes a light on the unit itself, runs about 3 years on two AAA cells, is sealed to IP67 and is the more affordable and better reviewed of the two. The Shelly Flood wins on everything around the leak: it adds a temperature sensor with temperature and freeze alerts, joins Wi-Fi directly with no hub, works with Google Home, SmartThings and Home Assistant, and carries a 2 year warranty. The catch on the Tapo is that it needs a Tapo Hub and reaches Home Assistant only partially. Pick the Tapo T300 if you already run Tapo devices and want a loud local alarm, and the Shelly Flood for a hub-free sensor that also watches for freezing pipes.
Shelly Flood
Shelly

Shelly Flood

Prime exclusive deal
Lowest price of the last 6 months
13% above its lowest price of the last 6 months (€23.90)

Last recorded priceFeb 6, 2026$24.99

Currently unavailable on Amazon USA
See on Amazon USA
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FeatureShelly FloodTapo T300Winner
Rating3.84.6Tapo T300
Warranty2 years1 yearShelly Flood
Battery Life1.5 years3 yearsTapo T300
IntegrationsGoogle Home, Samsung SmartThings, Home AssistantGoogle Home, Home AssistantShelly Flood
SensorsWater Leak, TemperatureWater LeakShelly Flood
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak Alerts, Low Battery AlertsShelly Flood
On Device Alert SoundNOYESTapo T300
On Device Alert LightNOYESTapo T300
Connectivity2.4 GHz WiFiOtherTie

What the differences mean

Hub or no hub

The Shelly Flood joins 2.4 GHz Wi-Fi on its own. The Tapo T300 talks to a Tapo Hub over a Sub-1G radio, so it cannot work without one, but that low power link is what stretches its battery.

Alarm on the device

The Tapo T300 sounds a siren and lights up when it gets wet, so someone in the house hears it even with the phone in another room. The Shelly Flood has neither and relies on notifications and automations.

Temperature and freeze alerts

Only the Shelly Flood measures temperature, and it can alert on temperature changes and on freezing. The Tapo T300 is a leak sensor only.

Battery

About 3 years on two AAA cells for the Tapo T300, against about 1.5 years on a CR123A for the Shelly Flood, whose battery is not included and whose Wi-Fi radio is the reason it drains faster.

Smart home reach

Both work with Google Home and neither with Alexa, Apple Home or Matter. The Shelly Flood adds SmartThings and full Home Assistant support; the Tapo T300 reaches Home Assistant only partially.

Which one to buy if

  • you already have a Tapo Hub or Tapo cameras
    Tapo T300

    The Tapo T300 pairs into the same app, and the hub it needs is already on your shelf.

  • you want someone at home to hear the leak
    Tapo T300

    The Tapo T300 has its own siren and light; the Shelly Flood stays silent.

  • pipes in a basement or garage could freeze
    Shelly Flood

    The Shelly Flood has a temperature sensor and freeze alerts, which the Tapo T300 lacks.

  • you run Home Assistant or SmartThings without a vendor hub
    Shelly Flood

    The Shelly Flood joins Wi-Fi directly and is fully supported by both.

Shelly

Shelly Flood

Prime exclusive deal

Last recorded priceFeb 6, 2026$24.99

Currently unavailable on Amazon USA
See on Amazon USA
  • + Warranty: 2 years
  • + Integrations: Google Home, Samsung SmartThings, Home Assistant
  • + Sensors: Water Leak, Temperature
  • - Rating: 3.8 vs 4.6
  • - Battery Life: 1.5 years vs 3 years
Winner
TP-Link

Tapo T300

Prime exclusive deal
$19.99

Last recorded price

Buy on Amazon USA
  • + Rating: 4.6
  • + Battery Life: 3 years
  • + On Device Alert Sound: YES
  • - Warranty: 1 year vs 2 years
  • - Integrations: Google Home, Home Assistant vs Google Home, Samsung SmartThings, Home Assistant

What owners say

Owners of both sensors describe a setup that works reliably once it is done and cheap enough to put one by every water source. Beyond that, they notice different things. Shelly Flood owners like configuring it from a phone browser with no app, and Home Assistant users say it appears on its own with both leak and temperature readings, but the complaint they repeat is Wi-Fi: pairing that takes a few attempts and units that drop off the network and need reconnecting, plus a CR123A cell that is not in the box. Tapo T300 owners single out the loud alarm on the unit and phone alerts that caught real leaks at water heaters and washing machines, and their frustration is with the hub: buyers who did not know one was needed, and sensor and hub models that did not match outside the US.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Shelly Flood
  • Tapo T300

Loading price history...

Frequently Asked Questions

Shelly vs Tapo: is the Shelly Flood or the Tapo T300 better?

The Tapo T300 for most buyers. It has an on-device siren and light, about 3 years of battery life and IP67 sealing, and it is the more affordable. The Shelly Flood is the better pick when you want no hub, freeze alerts from its temperature sensor, or SmartThings and full Home Assistant support.

What is the biggest difference between the Shelly Flood and the Tapo T300?

How they connect. The Shelly Flood connects straight to 2.4 GHz Wi-Fi, while the Tapo T300 needs a Tapo Hub and connects to it over a Sub-1G radio, which gives it the longer battery life.

Does the Tapo T300 need a hub?

Yes. The Tapo T300 only works through a Tapo Hub. The Shelly Flood needs no hub, since it connects to your Wi-Fi directly.

Which works better with Home Assistant, the Shelly Flood or the Tapo T300?

The Shelly Flood. It is fully supported in Home Assistant with leak and temperature readings, while the Tapo T300 is only partially supported and goes through its Tapo Hub.

Who should buy the Tapo T300?

Tapo households, or anyone happy to add a Tapo Hub, who want a sensor that sounds its own alarm, lasts years on a set of AAA batteries and works with Google Home.

Who should buy the Shelly Flood?

DIY builders on Home Assistant, SmartThings or Google Home who want a hub-free Wi-Fi sensor that also reports temperature and warns before pipes freeze, backed by a 2 year warranty.

Full comparison table

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