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The short answer
Check the current rating against what you will plug in, since a 10A plug will not run a heater. Prefer Matter or a brand with local control, so the plug still works if the manufacturer’s servers go down. Energy monitoring is worth having and its accuracy is approximate, so treat the readings as comparative rather than exact.
A smart plug is the cheapest way to find out whether you want a smart home at all. It also causes more frustration than its price suggests, because the cheap ones depend entirely on a manufacturer’s cloud, are 2.4GHz only in ways that complicate setup, and occasionally stop working when the company loses interest.
What to check before buying
Current rating
Plugs are rated in amps, commonly 10A, 13A, 15A or 16A depending on the region. A heater, a kettle or a tumble dryer draws a lot, and a plug rated below what the appliance needs is a fire risk rather than an inconvenience. Check the appliance’s rating and buy a plug comfortably above it, or keep smart plugs for lamps, chargers, televisions and other low-draw devices.
Local control
Cloud-only plugs stop working when the internet goes down or the manufacturer’s service has an outage. Plugs supporting Matter, or brands with a documented local API, keep working on your own network. This also makes them much faster to respond, since the command no longer travels to a server and back.
Energy monitoring
Useful for identifying what is actually costing you money, and typically accurate to within a few percent, which is fine for comparison and not for billing. Note that monitoring is not available on the cheapest plugs, and where it is present it is usually the difference between two otherwise identical models.
Physical size
A bulky plug blocks the adjacent socket on a double outlet, which is a daily irritation. Mini or compact versions exist for exactly this reason and are worth the small premium.
Almost all smart plugs are 2.4GHz only. If your router broadcasts one name for both bands, setup often fails because the app needs your phone on the 2.4GHz network. Temporarily disabling 5GHz, or splitting the bands, is the standard fix and takes two minutes.
Plugs worth considering
Kasa Smart Plug Ultra Mini 15A, four pack
Kasa plugs are the ones most people end up recommending, because the app is straightforward, setup rarely fails, and the units are small enough to use in pairs on a double socket. The 15A rating covers most household appliances rather than only lamps, which widens what you can do with them.
TP-Link Tapo Matter smart plug mini, 15A
Matter is the reason to choose this one. It works with Apple Home, Google Home, Alexa and SmartThings without a bridge, and local control means responses are near-instant and survive an internet outage. If you are starting a smart home now, buying Matter devices avoids being locked to one company.
Linkind Matter smart plug, works with Apple Home and others
A cheaper route to the same cross-platform benefit. The app experience is less polished than the bigger brands, and because Matter devices are controlled through your platform of choice, the manufacturer’s own app matters less than it would otherwise.
Govee smart plug, four pack
If you want four plugs for lamps and chargers and do not need energy data or local control, this is the practical choice. Check the current rating against anything with a heating element, and treat these as convenience devices rather than infrastructure.
Kasa Smart Plug HS103P2, two pack
A sensible way to try smart plugs without committing. These have been sold for years, which means the app support is mature and the failure modes are documented. Two is enough to discover whether you will use them before buying four more.
What we liked
- The cheapest way to start a smart home
- Energy monitoring identifies expensive appliances
- Matter models work across every major platform
- Schedules make lamps and chargers genuinely useful
What we didn't
- Most are 2.4GHz only, complicating setup
- Cloud-only models fail during outages
- Current ratings vary and matter for heaters
- Bulky units block the adjacent socket
What to actually do with them
Find what is costing you money
Put a monitoring plug on a suspect appliance for a week. Old fridges, dehumidifiers and desktop computers left on are the usual surprises.
Kill standby loads
A media cabinet full of devices on standby costs a modest but real amount. One plug switching the lot at night handles it, with the caveat below about devices that dislike being cut.
Schedule lamps while away
More convincing than a timer because you can vary it and control it remotely.
Restart awkward equipment remotely
A smart plug on a router or a modem lets you power cycle it from your phone, which is useful if you are ever away and something locks up.
Automate a heater or a fan with care
Only with a plug rated well above the appliance, and only with appliances designed to be switched at the mains.
Do not put a smart plug on anything that must not lose power unexpectedly, or anything with a heating element that relies on its own controls for safety. Medical equipment, aquarium heaters, fridges and freezers should stay on ordinary sockets. Never daisy-chain a smart plug into an extension lead carrying a high load.
Do smart plugs use electricity themselves?
Yes, typically under one watt each. Across a house that is a few pounds a year, and it is more than offset if they turn off genuinely wasteful standby loads.
Can I use a smart plug with a heater?
Only with a plug rated comfortably above the heater’s draw, and only with a heater designed to be switched at the mains. Many heaters and all oil-filled radiators draw close to the maximum a socket supplies.
Why will my smart plug not connect during setup?
Almost always because your phone is on the 5GHz network while the plug only sees 2.4GHz. Temporarily disable 5GHz on the router, complete setup, then turn it back on.
Is Matter worth waiting for?
It is available now and worth choosing. It gives local control, faster response and compatibility with every major platform, which removes the main long-term risk of buying into one manufacturer.
How accurate is the energy monitoring?
Usually within a few percent, which is fine for comparing appliances and identifying waste. It is not accurate enough to reconcile against a bill.
How to choose
Check the current rating against what you will plug in, and prefer Matter for local control and cross-platform support. Buy compact bodies so they do not block adjacent sockets, and get energy monitoring on at least one so you can go hunting for what is costing you money. Keep them away from anything that must never lose power.
