Smart Plugs Explained: Useful Ways to Upgrade Your Home

A smart plug sits between the outlet and an appliance and gives you a switch you can reach from a phone, a schedule or a voice assistant. That is all it does. It will not teach a lamp to dim or a fan to change speed; it cuts and restores mains power. Used for the right jobs, that is enough to be useful. Used for the wrong ones, such as an appliance that draws more than the plug is built for, it becomes a safety problem.

Jobs a smart plug does well

Natural Resources Canada notes that standby power can account for 5 to 10% of a household electricity bill, and that network-enabled devices can draw as much in standby as when fully active. That cuts both ways: a plug can cut the standby draw of a TV and console, but a smart plug is itself a connected device that stays powered to listen for commands. A simple timer power bar, which NRCan also mentions, can do the same job for fewer complications.

Heating appliances and high loads

Space heaters, kettles, toasters and similar heating appliances draw the most current, so they are where an under-rated smart plug is most likely to overheat. Treat them as a last resort for a smart plug rather than a first use, and read the maker’s guidance on both sides. Appliances that you would not want to run unattended should stay off a schedule altogether.

Setting one up, step by step

1. Choose a reputable seller and read the rating

   Electrical Safety First says to buy only from a reputable retailer or manufacturer, to avoid fake or substandard products. Look for the safety marking your region requires; Energy Safe Victoria, for example, says appliances in Australia must carry the regulatory compliance mark (RCM).

2. Plug it directly into a wall outlet

   Avoid stacking adaptors or chaining extension leads. Electrical Safety First says never to plug one extension lead into another, and Energy Safe Victoria advises against piggybacking adaptors in favour of a power board with a built-in safety device.

3. Connect it with the maker’s app

   Most Wi-Fi plugs join your home network through the maker’s app. Register the product so you can be reached about a safety recall, and keep the login details somewhere you can find them.

4. Change the defaults and turn on protection

   The UK’s National Cyber Security Centre (NCSC) advises changing any default password, using something hard to guess such as three random words, and turning on two-step verification if the app offers it.

5. Turn on automatic updates

   The NCSC says to switch on automatic updates or install them when prompted. It also suggests switching off remote access if you never use the plug away from home.

6. Test one low-risk device first

   Start with a lamp. Confirm the schedule works, then check what happens when power is cut and restored.

Wi-Fi, Thread, Matter: what the labels mean

Matter is an open smart-home standard from the Connectivity Standards Alliance. It runs over Wi-Fi, Ethernet or Thread, with Bluetooth Low Energy used for setup, and it is meant to work with more than one smart-home platform. The Alliance describes it as a local connectivity technology. A Matter-only device needs an internet-connected controller at home, such as a smart speaker or hub, if you want to control it when you are away, though some devices also connect straight to the manufacturer’s cloud. Devices using other protocols, such as Zigbee or Z-Wave, can join through bridges.

Thread, the low-power network some Matter devices use, is described by the Thread Group as an open, IPv6-based protocol based on the IEEE 802.15.4 radio. For a plug the practical points are simple: a Wi-Fi plug needs only your router; a Thread plug may rely on a compatible hub or router elsewhere in your home; and a Matter label is the easiest way to see that two brands can work together. Check which of your existing devices support it before you buy.

When things go wrong

• Support runs out. The NCSC suggests treating a product’s end-of-support date as a “use by” date. In the UK, products sold since 29 April 2024 must state it. Ask the same question wherever you live.
• The app or the internet fails. Electrical Safety First suggests working out how to operate a device without your phone. For a plug, that usually means the physical button on its side, or switching the appliance at its own control.
• Safety protection still matters. A smart plug is not a safety device. Electrical Safety First recommends residual current device (RCD) protection, and an RCD plug on the socket if your fuse board lacks one.
• Warning signs. Burn marks, buzzing or crackling, blown fuses, tripped breakers, or a plug too hot to touch mean unplug and contact the retailer, maker or a qualified technician.
• Selling or giving away. Do a factory reset first, as the NCSC advises, so your network details go with it.

Once the plug is working, it combines naturally with lighting. Better lighting for every room shows where a scheduled lamp earns its place, and if you are curious about other connected devices at home, Bluetooth trackers raise similar privacy and ecosystem questions. The rest of the Home Gadgets section covers more upgrades.