Sonoff Wi-Fi Smart In-Wall Outlet

Sonoff Wi-Fi Smart In-Wall Outlet

Launch Year: 2019

Model: IW100

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Our review

Sonoff Wi-Fi Smart In-Wall Outlet (IW100) Review: A 15 A Type B Socket With Energy Monitoring

Replaces a US wall outlet with a smart, metered one, working with Alexa, Google Home, SmartThings, IFTTT and Home Assistant.

The verdict

The Sonoff IW100 swaps a standard North American wall outlet for a smart one, rated at 15 A and 1800 W on 120 V, with energy monitoring built in and overvoltage, overcurrent and overpower protection. Its integration list is the broadest in this price bracket, covering Google Home, Alexa, Samsung SmartThings, Home Assistant and IFTTT, and it needs no hub since it connects straight to 2.4 GHz Wi-Fi. Apple HomeKit and Matter are the notable absences, along with power-off memory and an on-device button.

Best for
  • US Type B outlets
  • Energy usage tracking
  • Multi-platform smart homes
  • Permanent smart outlets

Pros

  • 15 A and 1800 W rating on 120 V
  • Energy monitoring on the connected appliance
  • Overvoltage, overcurrent and overpower protection
  • Works with Google Home, Alexa, SmartThings, Home Assistant and IFTTT
  • No hub required: direct 2.4 GHz Wi-Fi
  • Status LED for at-a-glance state
  • Two year warranty
  • Low price

Cons

  • No Apple HomeKit or Matter support
  • No physical on/off button, so no manual control without the network
  • No power-off memory after an outage
  • No overheating protection
  • Requires in-wall electrical installation
  • Type B format only, for North American outlets
  • Inductive and capacitive load support, child lock and LED adjustment are not documented
  • 2.4 GHz Wi-Fi only

Who is the Sonoff IW100 for?

It is for someone who wants a specific outlet to be smart permanently, without a plug-in adapter blocking the second socket or hanging out of the wall. Being an in-wall device it keeps the full 15 A rating available, which is what a US circuit expects, and it looks like a normal outlet once fitted. The unusually wide platform support means it works whichever ecosystem you use, and the IFTTT and Home Assistant options make it usable in scripted setups as well as voice-controlled ones.

What it handles

Resistive loads up to 1800 W at 15 A on 120 V, which covers standard North American household appliances. Energy monitoring reports what the connected device consumes, turning the outlet into a measurement point for a specific appliance rather than the whole house. Safety coverage is better documented than many competitors: overvoltage, overcurrent and overpower protection are all present, each cutting power when the outlet detects a fault. A status LED shows what it is doing, and automations run through any of the supported platforms.

What to know before you buy

Installation means wiring it into a back box on mains power, and the format is Type B, so it is for North American style outlets specifically. Apple HomeKit and Matter are not supported. There is no power-off memory, so the outlet does not restore its previous state after an outage, and there is no on-device on/off button, which means no manual control if Wi-Fi is unavailable, an important difference from models that keep a physical button. Overheating protection specifically is not included, though the other three protections are. Inductive and capacitive load support is not documented, and neither is child lock or the ability to dim the status LED. Wi-Fi is 2.4 GHz only. On the plus side, the warranty is two years.

Is the Sonoff IW100 worth it?

It is inexpensive for an in-wall smart outlet with metering, and the two year warranty and broad platform support give it an edge over cheaper alternatives. The missing physical button is the compromise worth thinking about: if the outlet controls something you might need to switch when the network is down, look for a model that keeps a manual control. Otherwise, for a US home on Alexa, Google Home, SmartThings or Home Assistant, it is a solid, cheap way to make one outlet permanently smart.

Frequently asked questions

What load can the Sonoff IW100 handle?

Up to 1800 W at 15 A on 120 V, for resistive loads. Inductive and capacitive load support is not documented.

Does it work with Apple HomeKit?

No. Google Home, Alexa, Samsung SmartThings, Home Assistant and IFTTT are supported. Apple HomeKit and Matter are not.

Can I switch it by hand?

No. There is no on-device on/off button, so control depends on the app, a voice assistant or an automation.

Does it measure energy use?

Yes. Energy monitoring is built in, so you can see the consumption of whatever is plugged into it.

Which outlet format is it?

Type B, the North American three-pin format, with a single AC outlet.

At a glance

Summary

Everything this wall outlet supports, grouped by category.

Size & Materials
4.6 × 2.8 × 1.4 in (116 × 70 × 35 mm)3.4 oz (97 g)
Safety
Overvoltage protectionOvercurrent protectionOverpower protection
Connectivity
2.4 GHz WiFi
Integrations
Google HomeAlexaSamsung SmartThingsHome Assistant
Features
Energy MonitoringStatus LED

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Company
Sonoff logo

Sonoff

4.3/ 5 avg ratingChina flagHeadquartered in China

Sonoff, a brand of ITEAD, makes affordable smart home devices including Wi-Fi and Zigbee switches, smart plugs, relays, sensors and the ZBBridge and Zigbee dongles. Its products work through the eWeLink app and integrate with Alexa and Google Home, and are popular with DIY users and Home Assistant fans for low-cost automation. Sonoff is well known for budget-friendly switches and Zigbee hardware.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Dimensions

4.6 × 2.8 × 1.4 in (116 × 70 × 35 mm)

Weight

3.4 oz (97 g)

Power
AC Load Voltage

120V

Resistive Load

YES

Max Resistive Load Power (Per Ouput)

1800W

Max Resistive Load Current (Per Ouput)

15A

Inductive Load

?

Max Inductive Load Power (Per Ouput)

?

Max Inductive Load Current (Per Ouput)

?

Capacitive Load

?

Max Capacitive Load Power (Per Ouput)

?

Max Capacitive Load Current (Per Ouput)

?

Outputs
Plug Format

Type B

AC Outlets

1

USB Ports

-

Safety
Overheating protection

NO

Overvoltage protection

YES

Overcurrent protection

YES

Overpower protection

YES

Connectivity
2.4 GHz WiFi

YES

5 GHz WiFi

NO

Bluetooth

NO

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Integrations
Google Home

YES

Alexa

YES

Apple HomeKit

NO

Samsung SmartThings

YES

Home Assistant

YES

Matter

NO

Features
Energy Monitoring

YES

Power Off Memory

NO

On/Off Button

NO

Status LED

YES

Adjust Status LED

?

Child Lock

?

Automations

YES

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