Water Leak Sensors · Head to head

eufy Security Flood & Freeze Sensor E20 vs Heiman Smart Water Leakage Sensor

Full Smart Water Leak Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Eufy and Heiman sites.
2026 verdict
For a self-contained leak alarm that does not need a base station, the Heiman Smart Water Leakage Sensor is the better of these two water leak sensors.
Heiman Smart Water Leakage Sensor
Winner
Heiman Smart Water Leakage Sensor
$16.99$19.9915% OFFPrime exclusive deal

Last recorded price

Buy on Amazon USA
It joins 2.4 GHz Wi-Fi on its own, is IP67 rated, sounds a 75 dB alarm with a status light, and runs about five years on a CR123A, costing less than the eufy Security Flood & Freeze Sensor E20. The eufy Security Flood & Freeze Sensor E20 answers with freeze detection below 4 C, five adjustable freeze thresholds and a 1.2 m probe that reaches under an appliance, on top of its own 75 dB buzzer and LED. Its limits are the eufy HomeBase it needs to report at all and its IP54 housing. Pick the Heiman Smart Water Leakage Sensor for a waterproof, hub-free alarm that works with Home Assistant and SmartThings; pick the eufy Security Flood & Freeze Sensor E20 when you already run a HomeBase and want freeze warnings and a probe.
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Featureeufy Security Flood & Freeze Sensor E20Heiman Smart Water Leakage SensorWinner
Price$39.99$16.99Heiman Smart Water Leakage Sensor
Weather ResistanceIP54IP67Heiman Smart Water Leakage Sensor
Battery Life5 years10 yearsHeiman Smart Water Leakage Sensor
Rating4.24.2Tie
Connectivity2.4 GHz WiFiOtherTie
IntegrationsHome AssistantNoneTie
SensorsWater Leak, TemperatureWater Leak, TemperatureTie
AlertsWater Leak Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak Alerts, Freeze Temperature Alerts, Low Battery AlertsTie
On Device Alert SoundYESYESTie
On Device Alert LightYESYESTie

What the differences mean

Freeze detection

The eufy Security Flood & Freeze Sensor E20 warns before pipes freeze, with a freeze alarm below 4 C and five thresholds you can set in the app. The Heiman Smart Water Leakage Sensor detects water only, with no temperature or freeze alerts.

Probe for tight spaces

The eufy Security Flood & Freeze Sensor E20 includes a 1.2 m probe that slips under an appliance where the round body will not fit. The Heiman Smart Water Leakage Sensor has no sensor cable, so it only detects water where the puck sits.

Base station or none

The Heiman Smart Water Leakage Sensor joins 2.4 GHz Wi-Fi directly and sounds its local alarm with nothing else attached, though app alerts need a Heiman gateway. The eufy Security Flood & Freeze Sensor E20 needs a compatible US eufy HomeBase before it reports anything.

Water resistance

The Heiman Smart Water Leakage Sensor is IP67 rated and survives a puddle or submersion. The eufy Security Flood & Freeze Sensor E20 is IP54, splash-resistant but not meant to be submerged.

Smart home reach

The Heiman Smart Water Leakage Sensor supports Home Assistant and partial SmartThings, but no Alexa, Google Home or Apple HomeKit. The eufy Security Flood & Freeze Sensor E20 reaches Home Assistant only through a community HACS integration, with no SmartThings, Alexa, Google Home, Apple HomeKit or Matter path.

Which one to buy if

What owners say

Owners of the Heiman Smart Water Leakage Sensor describe a simple, reliable stand-alone alarm: twist off the cover, drop in the battery, and it sounds the moment it gets wet, loud enough to hear without any app. Several bought it after a slow leak went unnoticed and use it purely as an early local warning, and they like the compact, durable housing in tight spots under a sink or behind a washer. The most repeated complaint is that a single-unit box does not include the gateway needed for app alerts, which was not always clear at purchase. Buyers connected through a gateway also mention the 2.4 GHz Wi-Fi link and Home Assistant compatibility as useful, and the five-year battery as a reason to forget about it.

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.

  • eufy Security Flood & Freeze Sensor E20
  • Heiman Smart Water Leakage Sensor

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Frequently Asked Questions

Which is better overall: eufy Security Flood & Freeze Sensor E20 or Heiman Smart Water Leakage Sensor?

The Heiman Smart Water Leakage Sensor wins overall on price, IP67 water resistance and integrations, with a hub-free install and a five-year battery. The eufy Security Flood & Freeze Sensor E20 keeps the edge on sensing, adding freeze alerts and a probe.

What is the biggest difference between the eufy Security Flood & Freeze Sensor E20 and the Heiman Smart Water Leakage Sensor?

The eufy Security Flood & Freeze Sensor E20 detects both leaks and freezing pipes below 4 C and includes a 1.2 m probe, but it needs a US eufy HomeBase. The Heiman Smart Water Leakage Sensor is a hub-free IP67 puck that detects water only.

Does the Heiman Smart Water Leakage Sensor need a hub?

No. It joins 2.4 GHz Wi-Fi directly and sounds its local alarm with nothing else attached, though app notifications need a separately sold Heiman gateway. The eufy Security Flood & Freeze Sensor E20 does need a compatible US eufy HomeBase.

Do both sensors detect freezing pipes?

Only the eufy Security Flood & Freeze Sensor E20 raises a freeze alert, below 4 C with five adjustable thresholds. The Heiman Smart Water Leakage Sensor reports water contact only.

Who should buy the Heiman Smart Water Leakage Sensor?

Buyers who want an IP67, hub-free leak alarm with a loud local sounder and light, a five-year battery, and Home Assistant support.

Who should buy the eufy Security Flood & Freeze Sensor E20?

Homes that already run a eufy HomeBase and want freeze alerts plus a probe for a tight spot under an appliance.

Full comparison table

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