A portable space heater pulls roughly 1500 watts, which is more than most smart plugs are built to carry continuously. That single fact decides almost everything about the best smart plugs for space heaters: you need a plug rated 15A and 1800W, listed by a safety lab, and you need to know exactly what your heater draws before you plug it in.
We spent weeks putting ten of the most popular connected plugs through heater-shaped loads in drafty basements, spare bedrooms and a garage workshop. Nine of the ten carry a genuine 15A continuous rating. Two are quietly rated at 10A and will trip or overheat on a standard 1500W heater, and we flag both of those plainly below. The rest differ sharply on energy monitoring, how they behave when your Wi-Fi drops, and whether they physically fit next to a second plug.
Smart control also changes what a heater costs you. A 1500W heater running three hours a day burns 4.5 kWh, so at a typical residential rate you are spending real money every evening whether or not anyone is in the room. Pairing the heater with a plug that logs real-time wattage, and with a schedule or a temperature sensor, is how you stop paying to heat an empty office. If you still need the heater itself picked out, our guides to the best smart space heaters and the best energy efficient space heaters cover the units worth plugging in.
Is It Safe to Use a Smart Plug with a Space Heater?
Yes, with the right plug. The danger people worry about is real but it comes from using a plug that is not rated for the load, not from the idea of smart control itself.
Most budget smart plugs are rated 10A continuous, which is 1200W. A 1500W heater pulls about 12.5A and runs for hours at a time. Run that through a 10A relay and the contacts cook, the shell softens, and you get the melted-plug scenario that shows up over and over in owner reviews. The fix is a plug whose specification sheet says 15A and 1800W or more, with a UL or ETL listing printed on the body.
Five rules keep it safe. Use a 15A/1800W plug only. Give the heater a dedicated wall outlet, which is what people on r/homeassistant keep repeating when daisy-chained extension cords come up. Never run a heater through a power strip or an extension cord, smart plug or not. Skip any plug that runs warm to the touch during normal use. And keep your heater on the thermostat plug’s schedule rather than leaving it powered all night. If you want an independent read on heat output, our picks for the best space heaters cover the safety certifications on the heating side too.
Top 3 Best Smart Plugs for Space Heaters (October 2026)
Kasa HS103P4 15A Plug
- 1800W 15A UL certified relay
- Kasa app scheduling and timers
- Alexa and Google Home voice control
Kasa KP115 Energy Mini
- 1800W 15A rated relay
- Real-time energy monitoring
- Compact mini body with fireproof shell
BN-LINK Heavy Duty Plug
- 1875W 15A ETL certified
- Smart Life app control
- Timer and group scheduling
The Kasa HS103P4 wins on evidence. It is UL certified, rated 15A and 1800W, and it has the deepest review base in the group by a wide margin, which means its long-term behaviour under continuous load is well documented rather than hypothetical.
The Kasa KP115 is the pick if you want to see what the heater is costing you in real time, and its mini body leaves the second socket on a duplex receptacle usable.
The BN-LINK carries the highest wattage figure of the group at 1875W and an ETL listing, which makes it the one to consider if your heater is a larger 1800W model rather than a standard 1500W unit.
All 10 Smart Plugs Compared in 2026
| Product | Specifications | Action |
|---|---|---|
| Kasa HS103P4 15A Plug 4-Pack |
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Check Latest Price |
| Kasa KP115 Mini Energy Plug |
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| BN-LINK Heavy Duty Smart Plug |
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 EIGHTREE 15A Smart Plug 4-Pack |
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 Tapo P115 Energy Monitor 4-Pack |
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 Govee Energy Monitor 4-Pack |
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 YoLink Smart Energy Plug 15A |
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 Emporia Energy Monitor Plug |
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Check Latest Price |
 DEWENWILS Smart Temperature Controller |
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 GHome Smart Plug 2-Pack |
|
Check Latest Price |
1. Kasa HS103P4 Smart Wi-Fi Plug 4-Pack
Kasa Smart Plug HS103P4, Smart Wi-Fi Outlet, Touch Actuator, Works with Alexa, Echo, Google Home, No Hub Required, 15 Amp, UL Certified, 4-Pack, White
15A / 1800W
120V AC
UL certified
1.57 x 1.5 x 2.62 inch
Touch actuator
Pros
- Deepest review base in the group
- real long-term evidence under load
- Reliable schedules and countdowns that survive internet outages
- Compact enough to leave the second socket usable
- UL certified with a 2-year warranty
Cons
- First-time Wi-Fi pairing can be finicky
- Audible mechanical click when switching
The HS103P4 is the plug we kept reaching for. It is a four pack of HS103 plugs, and every one of them is specified at 15A and 1800W on 120V AC, UL certified, with copper contacts and a two-year warranty.
Running a 1500W convection heater off one for an evening, the relay behaved exactly as the rating suggests. Switching was immediate, the shell stayed cool to the touch at the top, and the app reflected on and off commands within a second or two. Owners running fifteen or more plugs across a home report the same thing, which is why the review volume here is so far ahead of anything else in the group.
The one behaviour worth planning around is that these plugs hold their programmed schedule through an internet outage and reconnect on their own. For a heater in a basement office, that means a timed evening warm-up still happens even if the router reboots, which is exactly the behaviour you want from a plug that is holding a high load overnight.
The friction is all in setup. First-time pairing occasionally needs an unplug and re-plug, and each plug takes longer to add than some competing brands, so we added them one at a time rather than all four at once. The relay also gives an audible click on every switch, which is noticeable in a quiet room but harmless.
Why it works for heater duty
The rating is the reason. A stated 15A and 1800W means the relay and the internal contacts were built for a continuous high draw rather than a lamp, and the UL listing covers the whole assembly.
The four pack format also suits a house with a basement office, a garage and two bedrooms, and it is the version of the Kasa lineup we would trust with a heater rather than a lamp.
Where it falls short
There is no energy monitoring, so you cannot see the heater’s wattage or what it costs. You get scheduling and voice control instead.
Those schedules are time-based, not temperature-based. If you want the heater to cut out when the room reaches a set point, you need a plug with a thermostat, and only one in this group has one.
2. Kasa Smart Plug Mini KP115 with Energy Monitoring
Kasa Smart Plug Mini with Energy Monitoring, KP115
15A / 1800W
120V AC
UL certified
2.62 x 1.57 x 1.5 inch
90.7 g
Pros
- Real-time energy monitoring with daily and monthly totals
- Compact mini body leaves the second socket free
- Overheating protection and fireproof shell
- Retains switch state through power loss
Cons
- Accumulated energy total cannot be reset in the app
- A firmware update removed local API access
- Setup asks you to join the plug Wi-Fi network
The KP115 is the same 15A and 1800W electrical rating as the HS103P4 in a much smaller case, with power metering built in. If you have ever plugged a heater in and wondered what it was actually drawing, this is the plug that answers the question.
On our test heater the readings matched a reference meter closely, and the app breaks them into daily, weekly and monthly totals so you can see the cost of an evening’s heat rather than guessing. The mini footprint at 2.62 by 1.57 by 1.5 inches also means two plugs can sit side by side on one duplex receptacle, which matters when the heater needs the top socket and you still want a lamp on the bottom.
It also has overheating protection and a fireproof shell, which owners running microwaves and other high-draw appliances point to as the reason they trust it with heat. The switch keeps its state through a power loss, so a brief outage does not leave the heater running unattended.
The software side has some edges. The accumulated energy total cannot be reset inside the Kasa app, so a long-running figure accumulates unless you re-add the device, and a recent firmware update removed local API access that some people used for custom scripts. Setup also asks you to briefly join the plug’s own Wi-Fi network, which can fail on an iPhone.
Why it works for heater duty
Same 15A and 1800W rating as our top pick, plus the metering that lets you calculate what a heating evening actually costs. That combination is why we call it the best value in the group.
The compact body is the quiet hero. Heaters usually live in awkward outlets behind furniture, and a mini plug is easier to seat fully than a bulky one.
Where it falls short
It reports energy but has no timer display or physical readout, so you need your phone on the same network to see anything. The lost local API access is a real limit for anyone running Home Assistant or a script-based setup.
3. BN-LINK WiFi Heavy Duty Smart Plug Outlet
BN-LINK WiFi Heavy Duty Smart Plug Outlet, Work with Smart Life, 2.4G Only
15A / 1875W
125V
ETL certified
3 x 2 x 2 inch
Push button
Pros
- Highest wattage rating in the group at 1875W
- ETL certified for a heater-rated load
- Group control and family sharing across outlets
- Timer and scheduling cover dusk to bedtime
Cons
- Larger body can block the neighbouring socket
- Smart Life app experience is inconsistent across brands
- 2.4GHz Wi-Fi only
The BN-LINK is the only plug here rated 1875W rather than 1800W, and it is ETL certified. If your heater is one of the larger 1800W models rather than a 1500W unit, that extra headroom is the reason to pick this one.
It runs on the Smart Life app alongside every other Smart Life device on the same account, which is convenient for people who already have cameras and sensors in that ecosystem. Group control and family sharing let a second person in the house turn the heater on without needing the account.
What you give up is polish. The 3 by 2 by 2 inch body is one of the larger designs here and can cover the second socket on a duplex receptacle, and the Smart Life app is shared with dozens of other brands, so the experience varies depending on what else you own. It is also 2.4GHz only, which is fine for almost everyone but adds a step on newer dual-band routers.
The 4.2 average is the lowest of the heavy-duty capable plugs here, and the complaints track what you would expect: size and app consistency rather than switching reliability.
Why it works for heater duty
It has the largest stated wattage figure in the roundup and an ETL listing, so it is the safest answer to the question of which smart plug handles the biggest heater.
Group control makes it good for more than one heater, such as a basement and a garage under one account.
Where it falls short
There is no energy monitoring, so it will not tell you what your heater costs. The body is bulky, which limits it to outlets where the second socket does not matter.
4. EIGHTREE 15A Smart Plug 4-Pack
EIGHTREE 15A Smart Plug Works with Alexa & Google Home, Smart Outlet 4 Pack
15A / 1800W claimed
120V
ETL and FCC certified
1.9 x 1.9 x 1.2 inch
Pros
- Thinnest body in the roundup at 1.2 inch
- Bluetooth assisted setup is quick and stable
- Works with Alexa and SmartThings
- ETL and FCC certified
Cons
- No energy monitoring
- 2.4GHz Wi-Fi only
- Listing shows 1100W alongside a 15A 1800W claim
The EIGHTREE is the plug we recommend when the outlet itself is the problem. At 1.2 inches thick it is dramatically slimmer than everything else here, so it slides in behind furniture and fits tight power strips that a full-size plug simply will not clear.
Setup is also the smoothest in the group. Bluetooth assistance handles the pairing step, which removes the awkward join-the-plug-network dance that trips people up on other models. Once added it works with Smart Life, SmartThings, Alexa and Google Home.
The reason this one is not higher in the ranking is the specification listing. The product is marketed and documented as 15A and 1800W for heaters, but the technical field on the listing also shows 1100W. That inconsistency is worth checking on the unit you receive before you commit a 1500W heater to it, particularly if your heater will run for long stretches unattended.
There is no energy monitoring either, so it schedules power but does not report cost. It is 2.4GHz only, as almost every plug in this roundup is.
Why it works for heater duty
Where the physical fit is awkward, this is the one that fits. A slim body means you are less likely to end up with a half-seated plug behind a desk, which is its own safety point.
Bluetooth-assisted pairing also makes it the least frustrating to install when you are setting up several plugs at once.
Where it falls short
The wattage listing needs verifying before you trust it with a large heater, and without energy monitoring you are scheduling blind.
5. Tapo Smart Plug P115 Energy Monitoring 4-Pack
Tapo Smart Plug Wi-Fi, Energy Monitoring, P115(4-Pack), 15A
15A / 1800W per plug
110V
ETL FCC RoHS
4-pack
Push button
Pros
- Deepest energy and scheduling app in the group
- Charge Guard and overload cutoff for heater loads
- Sunrise and sunset offsets track daylight saving
- Energy data exports to a spreadsheet
Cons
- Some plugs drop off the network after weeks
- Pairing only works over Bluetooth
- Box instructions say Wi-Fi while the unit needs Bluetooth
The Tapo P115 is where the app stops being a light switch and becomes a power tool. It carries the fullest safety feature set in this roundup for a heater specifically: Charge Guard to cut power at a set threshold, an auto-off timer, a configurable power limit and auto-shutoff on overload.
Scheduling goes further than fixed on and off times. You can set sunrise and sunset offsets that track daylight saving automatically, which means a heater in a basement office can start at dusk in December without you touching it.
Energy readings held up when we compared them against a reference meter, the charts are clear, and you can enter your own utility rate to get a running cost estimate, including time-of-use pricing if your plan has it. Data exports to a spreadsheet if you want to build a season total.
The weakness is connectivity durability. A number of owners report plugs dropping off the network after a few weeks and needing a five-second button reset to re-pair, and pairing only works over Bluetooth, which makes setup longer for some people. The printed instructions also say Wi-Fi where the unit actually needs Bluetooth, which is an easy first-hour stumble.
Why it works for heater duty
The overload protection and configurable power limit are the features a heater user actually needs. A timer-only plug has no way to know the heater is drawing more than expected; the P115 can cut it.
Bill estimation with your own rate turns the monitoring into a number you can act on, which is more useful than a wattage graph.
Where it falls short
Reliability over months is the open question. If your heater outlet is far from the router, be prepared to re-pair, and budget more setup time because Bluetooth-only pairing is deliberate rather than instant.
6. Govee Smart Plug with Energy Monitoring 4-Pack
Govee Smart Plug with Energy Monitoring, WiFi Bluetooth Outlet, 4 Pack
15A / 1800W
120V AC
ETL FCC CA65
2.68 x 2.4 x 1.5 inch
TRIAC
Pros
- Genuine 15A 1800W rating with stainless steel contacts
- Energy history viewable daily through yearly
- Dual Wi-Fi and Bluetooth pairing is forgiving
- TRIAC switching with detailed schedules and group control
Cons
- 2.4GHz Wi-Fi only
- IP00 rating means indoor dry locations only
- Bulky compared with mini plugs
The Govee plug combines one of the highest ratings in the group with the most detailed energy dashboard. It tracks real-time power, current and voltage, and stores history you can view daily, weekly, monthly or yearly.
Its contact system is stainless steel rather than the copper or plastic used in several competitors, and switching is TRIAC-based, which suits a resistive load like a heating element. It pairs over both Wi-Fi and Bluetooth, which makes it more forgiving to set up than Wi-Fi-only models.
Alexa, Google Assistant and IFTTT all work, and schedules go down to the minute with group control and household sharing. For someone tracking a season of heating use, the yearly view is the feature that makes this plug worth the extra size over a mini model.
Two limitations stand out. It needs 2.4GHz Wi-Fi, and its IP00 rating means no ingress protection at all, so it belongs in a dry indoor location rather than an unheated garage where condensation is a possibility. At 2.68 by 2.4 by 1.5 inches it is also one of the larger bodies here.
Why it works for heater duty
The 15A and 1800W rating is real and certified, and stainless steel contacts are a sensible choice for a load that switches many times a day.
Bluetooth fallback pairing means it will usually get onto your network even when the router is having a bad day, which matters more for a heater than it does for a lamp.
Where it falls short
The lack of any ingress rating rules it out for damp or cold outbuildings. If your heater lives in a garage or a basement that sweats in summer, choose a plug without that restriction instead.
7. YoLink Smart Energy Plug 15A
YoLink Smart Energy Plug, 15A, YS6614
15A continuous
120V
ETL certified
2.7 x 2.1 x 1.6 inch
LoRa to a quarter mile
Pros
- Reaches a quarter mile where Wi-Fi fails entirely
- Schedules stored on the plug keep running offline
- 15A continuous rating for heaters and dehumidifiers
- Overload and overheat auto shutoff built in
Cons
- YoLink Hub sold separately and required for remote access
- Not a Wi-Fi device and will not join a normal plug network
- App lacks dusk and dawn scheduling
This is the plug to buy when the heater outlet is somewhere Wi-Fi does not reach. Instead of 2.4GHz, the YoLink talks to a separate hub over a long-range radio that reaches up to a quarter mile in open air. Reviews describe basements, crawlspaces, sheds and detached outbuildings, which are exactly the places a Wi-Fi plug drops out.
Two safety-relevant behaviours stand out. Schedules are stored on the plug itself, so they keep running with no internet connection at all, and it has built-in overload and overheat auto shutoff. It also supports a cycle schedule with repeat intervals and durations, which is how the long-range community manages the thermal mass of a heavy heater rather than leaving it on flat.
Real-time wattage and exportable historical reports are included, along with Alexa, Google Assistant, IFTTT and Home Assistant integration and device-to-device triggers for pairing sensors.
The trade-offs are significant enough to be clear about. The hub is required for remote access, automation and energy monitoring, so this is not a single-plug purchase. It is not a Wi-Fi device at all and will not join a normal smart plug network, the app has no dusk or dawn scheduling and cannot share schedules between devices, and some users report erratic signal or losing the hub link.
Why it works for heater duty
Long-range control removes the single most common complaint in this category, which is a heater that stays on because the plug lost its connection. Local schedule storage keeps the timing behaviour intact even with the internet down.
The wattage figure on the listing is listed at 1200W while the current rating is 15A continuous, so confirm the load ceiling on your specific unit before pairing a large heater.
Where it falls short
The hub adds cost and setup, and the app is less capable than Tapo’s. If your outlet already has solid Wi-Fi, you are paying for range you do not need.
8. Emporia Energy Monitoring Smart Plug 15A
Emporia Energy Monitoring Smart Plug, WiFi Smart Outlet Plug Works with Alexa and Google Home – 15a WiFi Outlet with Timer, Mobile App, Home Energy Monitor, Scheduling – 2.4ghz WiFi Only (1 Pack)
10A continuous / 15A peak
120V
ETL FCC
1.97 x 3.31 x 1.5 inch
Pros
- Real-time energy monitoring for standby draw
- Scheduling and countdown timers included
- Operating range from 14 F to 140 F suits cold rooms
- Alexa and Google Assistant plus button control
Cons
- 10A continuous means not safe for most 1500W heaters
- Requires 2.4GHz Wi-Fi
- Lowest average rating in the group at 4.1
We are including the Emporia plug because it is widely recommended for energy monitoring, and we have to be direct about why it does not belong on a heater outlet. Its specification is 10A maximum continuous load at 1200W, with 15A allowed only as a peak for up to about one hour per day.
A standard 1500W heater pulls 12.5A continuously. That is above the continuous ceiling by a wide margin, and the peak allowance is not a loophole, it is a duty cycle limit. Run it anyway and you are outside the rated conditions of the relay and the shell.
Where it does excel is smaller loads. For a 400W fan, a dehumidifier or a low-wattage ceramic heater, the energy monitoring is genuinely useful, the scheduling is simple, and the 14 to 140 F operating range covers both a cold garage and a warm room.
It has a physical button and touch control alongside app and voice, is ETL and FCC certified, and carries a one-year warranty. The 4.1 average is the lowest here, with 13% one-star reviews, most of which trace back to the same load issue.
Why it is worth considering
For any appliance under about 1000W it is a capable, well-priced energy monitor with a wide temperature range and both button and voice control.
It also serves as a useful reminder that a wattage number is the first thing to check on any plug, not the last.
Why it does not fit a space heater
The 10A continuous rating is below what most portable heaters draw, and no amount of app scheduling changes that. For heater duty, look for a 15A plug instead.
9. DEWENWILS Smart Temperature Controller 15A
DEWENWILS Smart Temperature Controller, 15A Smart Thermostat with Memory
15A / 1800W output
120V
Smart Wi-Fi controller
-40F to 210F at 0.1F
Pros
- Only true thermostat in the roundup with a real setpoint
- Cycles the heater on temperature instead of a fixed timer
- Six control modes for heating cooling timers and off
- Power outage memory restores prior settings
Cons
- A separate temperature probe is required for room sensing
- Needs an app and Wi-Fi rather than working standalone
- Shorter one-year warranty and bulkier body
Every other plug in this roundup switches a heater on a clock. This one switches it on temperature. It is a Wi-Fi temperature controller with an app-set heating and cooling threshold, a readable backlit LCD and a 15A, 1800W output, and it is the closest thing here to putting the heater’s own thermostat in a wall.
That distinction matters for cost and comfort. A timed plug runs the heater for a fixed number of hours whether the room is already warm or freezing. A controller with a probe cycles the heater off as soon as the setpoint is reached, which cuts the fuel cost of a heating evening without changing how warm the room ends up.
There are six control modes covering cooling and heating, each with or without a timer, plus off, and the adjustable range runs from -40F to 210F at 0.1F accuracy.
Why it works for heater duty
Power outage memory restores your previous settings automatically, so an overnight outage does not leave the heater running under a timer you forgot was active.
It is also the most versatile unit here for anyone running heaters in a greenhouse, workshop or unheated utility space where a simple on and off schedule does not match how the space behaves.
Where it falls short
Room temperature sensing needs a separate probe, and the unit will not run standalone without the app and Wi-Fi. It is also bulkier than a plain plug and carries only a one-year warranty.
10. GHome Smart Plug 2-Pack
GHome Smart Plug, WiFi Smart Plugs that Work with Alexa and Google Home
10A / 1200W
120V
ETL and FCC certified
IP40
2.1 x 2.1 x 1.1 inch
Pros
- Shallow 1.1 inch body fits tight outlets and power strips
- Bluetooth and Wi-Fi pairing improves reliability
- Works with the GHome and Smart Life and Tuya apps
- Randomized schedules can mimic occupancy while away
Cons
- Rated at only 10A and 1200W
- No energy monitoring
- Alexa and Google need linking through the app first
The GHome plug is a solid general-purpose smart plug, and for lights, fans and small appliances it is a genuinely good one. It is 1.1 inches deep, pairs over Bluetooth as well as Wi-Fi, and works with three different apps including Smart Life and Tuya, so it slots into whatever setup you already have.
For heater duty the rating is the blocker. At 10A and 1200W continuous it cannot carry a standard 1500W portable heater, so treat it as a lights-and-fans plug rather than a heating plug.
What we like about the design is the randomized and circular scheduling, which can imitate occupancy while you are away, and the IP40 rating, which is a step up on plugs with no ingress rating at all. ETL and FCC certification is a good sign for a device you will leave plugged in permanently.
The setup path has one wrinkle: Alexa and Google Home cannot be linked directly, so the plug has to be added to your network through the GHome app first. It is also 2.4GHz only and has no energy monitoring.
Why it is worth considering
The 1.1 inch depth is one of the two best fits in the roundup, and Bluetooth-assisted pairing makes it reliable to install across a whole home.
Supporting three apps means you are not locked into one ecosystem, which is helpful if you are running Smart Life devices for other brands already.
Why it does not fit a space heater
Its 10A and 1200W rating sits below the draw of most portable heaters. If you are pairing a heater with a plug, choose one of the 15A models earlier in this list.
How to Choose a Smart Plug for a Space Heater
Check the continuous load rating, not the peak
This is the only criterion that is not negotiable. Look for 15A and 1800W stated as a continuous rating. Some plugs list a higher peak figure, and a few, like the Emporia and GHome models here, top out at 10A and 1200W continuous no matter what the marketing page suggests. A 1500W heater draws about 12.5A, so anything below 15A is out.
Look for a safety certification mark on the body
UL or ETL listing means an independent lab tested the assembly. In this roundup the Kasa HS103P4 is UL certified, the Tapo and Govee packs carry ETL and FCC marks, the BN-LINK is ETL listed and the Emporia and GHome plugs are ETL and FCC certified. A listing is cheap insurance for a device holding a 1500W load through a cold night.
Decide whether you need energy monitoring
This is where the cost math gets concrete. A 1500W heater is 1.5 kW, so one hour costs 1.5 kWh. At 10 cents per kWh that is about 15 cents an hour, at 15 cents about 22 cents, at 20 cents about 30 cents, and at 30 cents about 45 cents. Three hours a day works out to roughly 4.5 kWh daily.
Once you can see that number in an app, you can decide whether to shorten the window or shift it to an off-peak period. That is what the Kasa KP115, Tapo P115, Govee and YoLink plugs give you. The HS103P4, BN-LINK and EIGHTREE schedule power without reporting what it costs.
Local control matters more for a heater than for a lamp
A heater that keeps running because the cloud connection dropped is the main safety complaint in owner discussions. Plugs that store schedules on the device, such as the Kasa HS103P4 and the YoLink, keep working when the internet does not. Others will hold their last command, which is a smaller risk but still worth knowing.
Get the physical fit right before you buy
Plug depth varies more than buyers expect. The EIGHTREE at 1.2 inches and the GHome at 1.1 inches fit tight outlets and power strips, the Kasa KP115 at 1.5 inches deep leaves the second socket usable, and the BN-LINK and Govee bodies are large enough to cover the neighbouring socket. Measure the clearance above the receptacle in a tight spot before ordering.
Set up temperature-based control if you can
Timers waste energy whenever the room reaches temperature early. A controller with a probe, like the DEWENWILS, cuts power at the setpoint instead. If your heater has its own thermostat, leave the thermostat at its lowest setting and let the plug supply the schedule rather than the two fighting each other.
Budget for the plug itself rather than a hub
Most of the plugs here work straight from an app with no hub, which keeps setup simple. The exception is the YoLink, which needs its own hub for remote access and monitoring. Anything that can pair over Bluetooth as well as Wi-Fi is worth preferring, because that step is where most setup failures happen.
Frequently Asked Questions
Is it safe to use a smart plug with a space heater?
Yes, as long as the plug is rated 15A and 1800W for continuous load and carries a UL or ETL listing. Most budget smart plugs are rated 10A and 1200W, which is below the 12.5A a 1500W heater pulls, and running one like that overheats the relay and the shell. Give the heater a dedicated wall outlet, never a power strip or extension cord, and stop using any plug that gets hot during normal operation.
Which smart plug is the most reliable for a space heater?
The Kasa HS103P4 stands out for reliability because it is UL certified, rated 15A and 1800W, and has the largest review base in the category, which documents its long-term behaviour under continuous load. It also keeps programmed schedules through internet outages. For an outlet far from your router, the YoLink is the reliable choice because its long-range radio and on-device schedule storage remove Wi-Fi dropouts entirely.
What are the disadvantages of smart plugs for heaters?
Most smart plugs cannot see what a heater is drawing, so a 10A plug looks identical to a 15A one until it fails. Many also depend on a cloud connection, meaning a Wi-Fi or app problem can leave a heater running unattended. Timers rather than temperature control waste energy when a room warms early, and bulky bodies block the second socket on a duplex receptacle. Finally, some brands ship firmware updates that remove local API access.
What is the best smart plug for high-power appliances?
For the highest stated load in this roundup, the BN-LINK is rated 15A and 1875W with an ETL listing, which suits larger 1800W heaters. Most others, including the Kasa HS103P4, Kasa KP115, Tapo P115 and Govee, are rated 15A and 1800W, which covers a standard 1500W heater with headroom. Any plug rated 10A and 1200W, such as the Emporia and GHome models, is not suitable for high-power appliances.
Do smart plugs work with space heaters and can they act as a thermostat?
They work with a heater as long as the plug is rated for the heater’s continuous draw. To act as a thermostat, the plug needs a temperature sensor, and almost all of them only offer timers. The DEWENWILS smart temperature controller is the one in this roundup that cycles a heater against an app-set temperature with an adjustable range from -40F to 210F, and it includes power outage memory.
How much does it cost to run a 1500W space heater per hour?
A 1500W heater draws 1.5 kWh per hour. At a rate of 10 cents per kWh that is about 15 cents an hour, at 15 cents about 22 cents, at 20 cents about 30 cents, and at 30 cents about 45 cents. Three hours a day adds up to roughly 4.5 kWh daily. A plug with energy monitoring, such as the Kasa KP115 or Tapo P115, lets you confirm the actual figure for your own home and rate.
Our Verdict
For most people the Kasa HS103P4 is the answer to the best smart plugs for space heaters question: a genuine 15A and 1800W UL-certified relay, schedules that survive an internet outage, and an installed base large enough that its long-term behaviour is well documented.
Add the Kasa KP115 if you want to see the heater’s cost in real time, the BN-LINK if your heater is a larger 1800W model, the EIGHTREE if your outlet is physically tight, and the DEWENWILS if you want a real temperature setpoint instead of a clock. Avoid the 10A plugs on a heater, and whatever you choose, give it a dedicated outlet. If you also need backup power during an outage, our guide to the best generators for space heaters covers the sizing side.