Every winter the same question shows up on home automation forums: can you plug a space heater into a smart plug, or is that the fastest way to burn down a room? The short answer is yes, with conditions. A UL or ETL listed plug rated 15 amps and 1800 watts at 120 volts, on a circuit with nothing else high-draw on it, will handle a 1500W portable heater without trouble. What will not work is a no-name plug from a bargain bin, an extension cord, or a power strip in the middle of the chain.
That distinction matters because a 1500W heater pulls 12.5 amps at 120V, which is right up against the 12.5A continuous ceiling of a standard 15A receptacle. There is almost no headroom. So when we picked the best smart plugs for space heaters, load rating was the first filter and features were the second.
We went through twelve plugs rated for 15 amps or better, weighing the published wattage against the amperage math, the safety certification, the form factor at the wall, and how the thing behaves when the Wi-Fi drops at 2am. Eleven of the twelve carry a UL or ETL mark. One does not publish a listing at all, and we flagged it rather than quietly dropping it. Everything here is written for 2026 shoppers, and every number below comes from the manufacturer’s published specification or from the owner’s review history, not from a marketing page.
Before the picks, here is the safety framework that decides whether any of them belong on your wall. Skip it and you are guessing with 1,800 watts of heat.
Table of Contents
Top 3 Smart Plug Picks for Space Heaters in October 2026
These are the three we would put in a bedroom, an office and a basement respectively. Full reasoning for all twelve follows below.
Kasa Smart Plug Ultra Mini 15A EP10
- 15A / 1800W rating
- UL certified
- Leaves second outlet free
Kasa KP115 Energy Monitoring
- 15A / 1800W rating
- Real-time energy monitoring
- Fireproof shell
The EP10 takes the top slot on the strength of volume and consistency: 15A at 1800W, a UL certificate, a body small enough to leave the second outlet usable, and more than 40,000 reviews averaging 4.5 stars with reports of heaters running through it for years.
The KP115 is the pick if you want to see what the heater is actually costing you, with real-time wattage plus daily, weekly and monthly totals and a fireproof shell with overheating protection.
The meross MTS960 is the only pick here that behaves like an actual thermostat, with a 79-inch probe, an adjustable differential to stop short-cycling, and a backlit LCD showing the current temperature.
All 12 Picks Side by Side in October 2026
Max load and certification are the two columns that decide this list. Everything else is preference.
| Product | Specifications | Action |
|---|---|---|
| Kasa Smart Plug Ultra Mini 15A EP10 |
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| Kasa Smart Plug Mini KP115 |
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 BN-LINK Heavy Duty Smart Plug 4-Pack |
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 Govee Smart Plug 15A H5080 |
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 Tapo Smart Plug P115 4-Pack |
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 Kasa Matter Smart Plug KP125M |
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 YoLink Smart Energy Plug YS6614 |
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| meross Temperature Controller MTS960 |
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 eWeLink Smart 16A Switch TH16 |
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 Shelly Plug US Gen4 |
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 Tapo Matter Smart Plug P110M 4-Pack |
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 DIGITEN Wireless Thermostat Outlet |
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Check Latest Price |
1. Kasa Smart Plug Ultra Mini 15A (EP10) – Best Overall
Kasa Smart Plug Ultra Mini 15A, EP10, Smart Home Wi-Fi Outlet
15A / 1800W at 120V
UL certified
2.36 x 2.03 x 1.5 inches
2 year warranty
Pros
- 15A and 1800W rating with a UL certificate
- Fast app-guided setup that usually works first try
- Compact body leaves the second duplex outlet usable
- Physical button and status LED
- Dependable scheduling over years of use
Cons
- No Apple HomeKit support
- Some units fail to join the network and need repeated resets
- On and off only with no dimming or energy reporting
- Boxy body pushes the heater cord outward
This is the plug we keep coming back to because the numbers are boring in the best way. Fifteen amps, 1800 watts at 120 volts, UL certified, and a two-year manufacturer warranty. There is no asterisk on the load rating.
The 2.36 by 2.03 by 1.5 inch body is the reason it lives in our recommended slot rather than sitting in a drawer. It leaves the second half of a duplex receptacle usable, which matters in older rooms where you need the outlet next to it. The push button is on the plug itself, so you can cut power without reaching for your phone.
Owners report running small electric heaters and electric fireplace inserts through it for years without a dropout. With more than 40,000 reviews averaging 4.5 stars, any reliability problem worth knowing about would have surfaced by now.
What you give up is reporting. This is an on and off device, so if you want to know what the heater is drawing you need a different pick. The Kasa app handles schedules, countdowns, and voice control through Alexa and Google Assistant, all over 2.4GHz Wi-Fi.
Two caveats worth knowing before you commit. It has no HomeKit support, so Apple Home users should look at the KP125M below. And a minority of units refuse to complete network setup until you run repeated reset cycles, so keep the physical button within reach during setup.
Who the EP10 suits
A renter or homeowner with a standard 15A receptacle, a 120V heater, and no interest in energy data. It handles bedtime shutoff and phone control at the lowest complexity of anything on this list.
If you need to know the heater’s cost, pair it with a plug that reports wattage rather than trying to estimate from the dial.
Who the EP10 does not suit
Apple Home households, since there is no Matter or HomeKit radio in this model. Also skip it if your 2.4GHz network is weak at that wall, because this plug has no Bluetooth fallback.
A plug that physically covers the second outlet is a plug that gets unplugged and shoved behind furniture to make room. Check the outlet before you order more than one.
2. Kasa Smart Plug Mini KP115 – Best for Energy Monitoring
Kasa Smart Plug Mini with Energy Monitoring, KP115
15A / 1800W at 120V
Real-time wattage and history
Overheating protection, fireproof shell
2.62 x 1.57 x 1.5 inches
Pros
- 15A and 1800W rating confirmed for full-circuit loads such as a microwave
- Real-time watts plus daily weekly and monthly totals
- Overheating protection and fireproof shell
- Keeps working on the LAN with internet access blocked
- Compact enough to leave the adjacent outlet free
Cons
- Energy totals cannot be reset inside the Kasa app
- No Apple HomeKit support
- 2.4GHz only and some firmware updates removed local scripting
- Schedules can drift out of sync after a time change
The KP115 is the same 15A and 1800W rating as the EP10 with one addition that matters for heating: a metering circuit that shows live wattage and accumulates totals you can chart by day, week and month. When someone asks what a 1500W heater costs to run, this is the plug that answers with real data instead of an estimate.
The technical sheet lists overheating protection, a fireproof shell, and a sliding safety cover over the outlet openings. Owners confirm it can carry a full 15A load, and one of the more common uses in reviews is a microwave, which sits in the same current class as a large portable heater.
It also works locally on the LAN. That means if your internet drops, the plug still responds from your phone on the same network, which is exactly the failure mode you worry about when the heater is the load.
The friction is in the software details. The energy counters cannot be zeroed from inside the Kasa app, so long-term tracking needs a third-party utility. Scheduling can drift out of sync when local time changes, and some recent firmware updates removed local API scripting for certain users.
Like the EP10, this is a Wi-Fi only plug on 2.4GHz with no HomeKit radio and no Bluetooth.
Who the KP115 suits
Anyone whose main question about automating a heater is cost. Seeing the heater draw around 1500 watts in real time, then watching the daily total, is the fastest way to decide whether the dial stays at high or drops to low.
It is also a good second heater plug in a house where you already run the EP10 in a bedroom.
Who the KP115 does not suit
People who need the counter reset, or who want local scripting for Home Assistant automations after a firmware update. Both are documented limitations, not bugs you will find quickly.
It also shares the EP10’s 2.4GHz-only constraint, so a 5GHz-only network or a far-away access point is a problem.
3. BN-LINK Heavy Duty Smart Plug (4-Pack) – Best for Multiple Rooms
BN-LINK WiFi Heavy Duty Smart Plug Outlet, Work with Smart Life, 2.4G Only
15A / 1875W at 125V
ETL certified
Smart Life app, no hub
3 x 2 x 2 inches, 12 ounces
Pros
- Highest published wattage on this list at 1875W on a 15A rating
- ETL certified for safety
- Works with Smart Life
- Alexa and Google Home
- No hub required and simple timed scheduling
- Four plugs in one box cover several rooms
Cons
- 2.4GHz only so 5GHz-only networks fail
- 4.2 average rating with 10 percent one-star reviews showing a real failure rate
- No energy monitoring on this heavy-duty model
- Bulkier body than a mini plug
The BN-LINK BNC-60 is the highest wattage rating in this group at 1875 watts on 15 amps, and it is ETL certified. That extra margin over the 1500W heater load is exactly what the continuous-load rule asks for, and the four-pack format means you can cover a bedroom, an office and a basement without buying three different products.
It runs on the Smart Life app, which is the app a lot of budget smart home gear uses, and needs no hub. Voice control works through Alexa and Google Home. Scheduling is the simple timed kind rather than the sunrise and sunset variety.
The reason this sits at three instead of one is the rating distribution. Owners report a noticeably larger share of connectivity and reliability complaints than the Kasa plugs, with 10 percent one-star reviews against a 4.2 average. On a heater that is a worse trade than it looks, because a plug that goes offline mid-schedule is a plug you stop trusting.
It is also the bulkiest option here at 3 by 2 by 2 inches and 12 ounces, so check that it does not cover the second outlet in a tight receptacle.
There is no energy monitoring on this model, so the wattage advantage is about load headroom rather than visibility.
Who the BN-LINK suits
Households that want one certified plug type across several rooms, and households already running the Smart Life app for other devices.
The 1875W rating gives the most thermal margin of anything we tested against a 1500W heater.
Who the BN-LINK does not suit
Anyone who cannot tolerate a failure rate. If you already run TP-Link, the same four-pack idea with better reported reliability exists in the Tapo models further down.
It also will not join a 5GHz-only network, and it has no Bluetooth path if the Wi-Fi drops.
4. Govee Smart Plug 15A H5080 – Best When Wi-Fi Drops
Govee Smart Plug 15A WiFi Bluetooth Outlet 1 Pack, Remote Group Control
15A at 120V
Wi-Fi plus Bluetooth
Fire-resistant materials
0.08 kg
Pros
- Highest average rating in the group at 4.6 stars
- Wi-Fi and Bluetooth with local fallback when the internet drops
- 15A rating for higher-draw appliances
- Compact single-outlet form that leaves the other outlet free
- Multiple timers
- schedules and group control
Cons
- 2.4GHz only
- Home screen widget takes several seconds to connect before responding
- No energy monitoring on this model
- Outlets cannot be switched manually when Wi-Fi is down
The Govee H5080 carries the highest average rating of anything we looked at, at 4.6 stars across more than 6,000 reviews with 81 percent five-star. Owners also praise range, reporting stable 2.4GHz across a two-storey home and out to roughly 150 feet.
The reason it earns a place on a heater list is the Bluetooth fallback. When your internet drops, this plug still responds from a phone on the same network. On a lamp that is a nice-to-have. On a heater that someone might be asleep near, it is the difference between a schedule that failed and a plug you can still switch off.
It is rated 15 amps at 120 volts and built from fire-resistant materials, with ETL and FCC certification. Reviewers specifically describe using it for heat lamps and heating pads, which is a similar load class to a portable heater.
Compactness is a genuine strength here. Owners consistently describe a design that occupies one outlet position, so the second half of the receptacle stays available.
The Govee Home app supports multiple timers, schedules, routines and group control, which is enough for a bedroom heater on a bedtime routine.
Who the Govee suits
People on flaky internet, and people who want local control without setting up Home Assistant. Bluetooth fallback is the closest thing to a guaranteed off switch that a budget plug offers.
It is also a good pick for a heat lamp or a heated blanket on the same circuit class.
Who the Govee does not suit
Anyone who needs energy readings, and anyone who wants the plug to respond instantly to a tap. The home screen widget takes several seconds to wake, and the outlets cannot be controlled manually when Wi-Fi is down.
It remains 2.4GHz only, so a 5GHz-only network is a non-starter.
5. Tapo Smart Plug P115 4-Pack – Best Safety Features
Tapo Smart Plug Wi-Fi, Energy Monitoring, P115(4-Pack), 15A
15A / 1800W
ETL, FCC and RoHS
Charge Guard and power-limit cutoff
Polycarbonate body, four plugs included
Pros
- Charge Guard cuts power below a set draw threshold
- Power-limit overload protection trips the outlet
- Timed auto-off reapplies every time the plug is switched on
- Sunrise and sunset scheduling with adjustable offsets
- Energy cost estimates using your utility rate with Excel export
Cons
- Some units drop off the network after weeks and lose stored history
- About half of owners pair over Bluetooth because there is no setup hotspot
- Bulkier than the Kasa mini plugs
- Four-packs can include a dead unit
The P115 is the only plug here with a protection feature set designed for high-draw and unattended loads. Charge Guard cuts power when draw drops below a threshold you set, a wattage limit trips on overload, and the timed auto-off reapplies every single time the plug is switched back on. That last detail is the one that matters for a heater, because it means a routine cannot be defeated by someone flipping the switch back on.
It is rated 15 amps and 1800 watts, ETL, FCC and RoHS certified, and includes energy tracking with charts and utility-bill cost estimation that exports to Excel. Sunrise and sunset schedules with hour offsets are a nice touch for heating a room before you get up rather than on a fixed clock.
Owners confirm the energy readings check out against reference meters. That is the plug to buy if your question is what the heater is costing per hour.
The compromise is connectivity. A recurring pattern in reviews is units dropping off the network after a few weeks, and one owner running eight plugs had two that stopped responding and needed reinstalling, with stored history lost when they re-paired as new devices.
Pairing is unusual too. Because these plugs do not expose a setup hotspot, roughly half of owners configure them over Bluetooth rather than Wi-Fi.
Who the Tapo P115 suits
People running a heater in a room where a forgotten schedule matters, and people on time-of-use rates who want the heater to run overnight instead of at peak.
It is also the pick for anyone who wants the heater to shut itself down if draw goes wrong, since the power-limit cutoff is the closest thing to a safety interlock in this group.
Who the Tapo P115 does not suit
People with weak 2.4GHz coverage, because the connectivity complaints are consistent rather than isolated. Check signal strength at the outlet before committing.
It is bulkier than the Kasa mini plugs, so verify the second outlet stays usable.
6. Kasa Matter Smart Plug KP125M – Best for Apple Home
Kasa Matter Smart Plug with Energy Monitoring, KP125MP2, 15A/1800W Max
15A / 1800W at 120V
Matter, SmartThings and Wi-Fi
UL, FCC and RoHS
2.62 x 1.57 x 1.5 inches, 2 year warranty
Pros
- Matter support gives local LAN control that survives an internet outage
- One of few Matter plugs that joins Apple Home without a separate hub
- Energy monitoring with adjustable wattage thresholds that can auto-shutoff
- Compact flame-retardant UL certified design
- Keeps its programming and reconnects after power loss
Cons
- Some units fall back to a 192.168.1.80 address and stop answering Alexa until a factory reset
- Energy telemetry is not exposed to Home Assistant despite Matter support
- Setup requires picking the exact model from a long app list
- TP-Link advises against pairing its smart plugs with heaters
This is the plug for Apple Home households that also want energy data. It is rated 15 amps and 1800 watts at 120 volts, certified UL, FCC and RoHS, with a two-year warranty and copper and brass contacts.
Matter support means local LAN control that keeps working when the internet goes down, and automations continue running rather than failing. It is one of the few Matter plugs that joins Apple Home without a separate Matter controller, and most features remain reachable in the Kasa app without one at all.
Energy monitoring includes user-set wattage thresholds that can raise an alarm or cut the outlet, which gives you a ceiling on what the heater can draw. Owners also report that it holds its programming and reconnects on its own after a power loss, which is what you want from something on a heating schedule.
Now the part you need to read. One reviewer reports a plug arcing and burning part of the unit and the wall outlet after use with an oil-filled space heater, and notes that TP-Link support advises against pairing its smart plugs with heaters and AC units because of inrush current.
We are not going to bury that. The manufacturer’s own guidance is the single most important line in this review, and if you own an oil-filled radiator you should take it literally.
The other known issue is the fallback address behaviour, where a unit lands on 192.168.1.80 and stops answering voice commands until you hold the button for a ten-second factory reset. Energy telemetry is also not exposed to Home Assistant even though Matter is supported.
Who the KP125M suits
Apple Home users who want one device that works with Siri, Alexa, Google Home and SmartThings, and who value schedules that survive an internet outage.
For fan heaters and infrared heaters on a clean 15A circuit, the load rating and UL certification hold up.
Who the KP125M does not suit
Owners of oil-filled radiators, on the manufacturer’s own advice. Anyone planning to run this plug unattended for long stretches on a schedule you cannot verify in person is also better served by a plug with a mechanical temperature controller.
Home Assistant users wanting energy data should know it is not exposed there despite the Matter badge.
7. YoLink Smart Energy Plug YS6614 – Best for Long Range
YoLink Smart Energy Plug, 15A, YS6614
15A at 120V
Quarter mile LoRa range
Schedules stored on the plug
Overload protection, ETL certified
Pros
- LoRa reaches roughly a quarter mile where Wi-Fi and Zigbee fail
- Bridge
- shed and basement setups keep working
- Schedules stored on the plug continue through an internet outage
- Built-in overload and overheat protection
- Real-time wattage plus exportable historical reports
Cons
- Requires a separately purchased YoLink Hub and has no Wi-Fi at all
- Strict 15A and 1800W ceiling rules out pumps and workshop machinery
- App lacks dusk and dawn scheduling
- Some report signal strength fluctuating at close range
The YoLink YS6614 solves a problem no Wi-Fi plug can: a heater in a detached building, a concrete basement or a solar shed where 2.4GHz simply does not reach. The LoRa radio gets roughly a quarter mile of open-air range to a separately sold YoLink Hub.
Owners place these in exactly those spots and report rock-solid connectivity where Wi-Fi fails. One owner uses it to cut power to an electric blanket after two hours, another runs a heating pad schedule, and others tie it to temperature sensors to switch a furnace or pump.
Two details make it safer than it sounds. Schedules are stored on the plug itself and keep running during an internet outage, and there is built-in overload protection that cuts power on overheating or overload.
It is rated 15 amps at 120 volts and ETL certified, with real-time wattage and exportable energy reports. Voice control works through Alexa, Google Assistant and IFTTT, and device-to-device triggering lets other YoLink sensors switch it directly.
The catch is the hub. There is no Wi-Fi radio in this plug at all, so the YS6614 only functions with the hub purchase. The app also lacks dusk and dawn scheduling, and one reviewer describes the relay as light-duty for its 15A rating.
Who the YoLink suits
Anyone heating a space that Wi-Fi cannot reach. Basements, sheds, garages and detached workshops are the exact scenario, and the range claim is the whole point of the device.
It also works well with other YoLink sensors for temperature-based switching, which is the closest thing to thermostat behaviour without a probe. In an unheated crawl space where condensation is the concern rather than comfort, our crawl space dehumidifier picks cover that side of the problem.
Who the YoLink does not suit
Anyone who wants a hub-free setup, because the hub is mandatory and it is a second purchase to account for.
The strict 15A ceiling also rules out anything larger, and the app’s scheduling is less flexible than the Tapo models.
8. meross Smart Temperature Controller MTS960 – Best for Thermostat Control
meross Smart Temperature Controller Work with Apple HomeKit, 15A 1800W
15A / 1800W at 120V, 3600W at 240V
79-inch probe
Backlit LCD
Up to 12 daily periods, 2 year warranty
Pros
- Purpose-built for heating loads such as infrared and fan heaters
- Adjustable differential stops a heater short-cycling constantly
- Backlit LCD readable in the dark and switchable units
- One owner verified it running a 1500W oil-filled radiator with no excess warmth
- Schedules retained through a Wi-Fi dropout with power-off memory
Cons
- App scheduling is unintuitive and a midnight entry cannot be removed
- 2.4GHz only with no QR code for manual network entry
- Reported Wi-Fi failures needing repeated factory resets
- Long cord and bulky wall-plug form compared with mini plugs
This is the only pick on the list that is an actual thermostat rather than a switch. A 79-inch stainless steel probe, water-submersible, measures from minus 22 to 230 degrees Fahrenheit, and the default control range goes up to 95 degrees with app adjustment beyond that.
For heater duty the differential setting is the feature that matters. An adjustable deadband up to 20 degrees stops a heater from clicking on and off constantly as the room crosses the setpoint, which is exactly what a binary smart plug does badly.
One owner verified it running a 1500W oil-filled radiator with no excess warmth at the plug, which is the result we wanted to see for a heater at the top of this list’s load range. Maximum load is 15 amps and 1800 watts at 120 volts, or 3600W at 240V.
It also handles up to 12 scheduling periods per day and keeps running on schedule when Wi-Fi disconnects, with power-off memory restoring settings after an outage. Compressor protection delay stops the rapid restart that wrecks a compressor, and there is a child lock and sensor failure alarm.
Works with Apple Home, Alexa, Google Home and SmartThings, and can trigger other smart devices on temperature thresholds.
Who the meross MTS960 suits
Anyone who is tired of the overshoot problem. A dumb plug gives you a heater that runs too hot then runs cold; a probe with a deadband gives you a room that holds temperature.
It is also rated for infrared heaters, fan heaters and oil-filled radiators explicitly, and it doubles as a controller for mini-fridges and window air conditioners.
Who the MTS960 does not suit
People who want a discreet outlet. At 7.8 by 8.4 inches with a long cord, this is the bulkiest device here, and a heater in a bedroom will see it.
Its 4.1 average reflects a 13 percent one-star share driven by a confusing scheduling app and units that lose Wi-Fi and need repeated resets or fail outright. Check that your 2.4GHz network offers manual entry, since there is no QR code.
9. eWeLink Smart 16A Switch TH16 – Highest Switching Capacity
MHCOZY eWeLink Smart 16A Switch with Temperature and Humidity Monitoring, WiFi Thermostat Controller Compatible with Alexa Google Home (Temperature only)
16A / 3000W at 250V
DS18B20 probe extendable to 16.4 ft
Auto mode switching at a set temperature range
50 g
Pros
- Switching capacity of 16A and 3000W
- higher than any 15A plug here
- DS18B20 probe on a cable extendable to 16.4 feet
- Auto mode switches a heater on and off at a configured temperature range
- Temperature history and power monitoring in the app
- Works with Alexa and Google Home
Cons
- High failure rate reported with units dying within days or weeks
- Settings do not persist and the unit reverts to Celsius each time the app opens
- Support is reported as poor with unanswered emails
- Multi-step pairing through an ITEAD hotspot
The TH16 has the largest switching capacity in this group at 16 amps and 3000 watts, which puts meaningful headroom above a 1500W heater. It ships with a DS18B20 three-pin temperature probe on a cable extendable to 16.4 feet, so the sensor can sit away from the switch itself, and auto mode will switch a connected heater on and off at a configured temperature range.
That is thermostat-style behaviour from a device that also handles larger loads than anything else here. The eWeLink app keeps temperature history and power monitoring, and it integrates with other eWeLink and Sonoff gear.
We are including it with an honest warning. Its 4.0 average comes with a 14 percent one-star share, the worst tail of any product in this roundup, and the pattern is hardware failure within weeks along with probes that stop reading until reset.
Who the TH16 suits
People with a wired probe location where temperature genuinely differs from the switch position, such as a greenhouse, a reptile area or a room where the outlet is in a draught.
The 16A contact rating also suits a load above what a 15A plug would be comfortable holding continuously.
Who the TH16 does not suit
Anyone who wants a device that is still working in six months. Multiple owners report units dying within days or weeks, and those who hit problems switched to a Sonoff alternative and rate it far better.
Settings not persisting means you reconfigure after every app open, and pairing runs through an ITEAD-named hotspot in several steps.
10. Shelly Plug US Gen4 – Best for Local Control
Shelly Smart Plug UL WiFi Bluetooth Zigbee Matter Outlet, US Gen4 White
15A / 1800W
UL and RoHS certified
Wi-Fi, Matter, Bluetooth and Zigbee
Local scripting with no cloud, 3 year warranty
Pros
- UL certified with real-time power metering and full local control with no cloud service
- Works with Home Assistant and is discovered automatically on pairing
- Ambient light sensor with a multicolor LED that reflects draw
- Operates as a standalone smart outlet with no phone app required
- Solid build from Shelly Europe with a three-year warranty
Cons
- Returns in a powered-off state after an outage until the power-on state is changed in firmware
- Digest authentication is off by default so any device on the LAN can control it
- 15A protection trips on high inrush loads
- BLE proxy mode is passive only
- Some units ship with beta firmware and 1-star reports of random power-off
The Shelly Plug US Gen4 is the pick for anyone who does not want a heater depending on a vendor’s cloud staying online. It is rated 15 amps and 1800 watts, UL and RoHS certified, with a three-year warranty, and it carries Wi-Fi, Matter, Bluetooth and Zigbee in one body.
Local scripting and a built-in web interface mean no cloud service and no phone app are required. Owners running Home Assistant report that it is discovered and configured automatically on pairing, which removes the usual integration work.
Real-time power metering is standard, and the ambient light sensor drives a multicolor LED that changes with wattage draw, which is a genuinely useful diagnostic when you want to know what a heater is pulling without opening an app.
Two configuration notes matter before you automate a heater with it. It returns in a powered-off state after an outage unless you change the power-on behaviour in firmware, and digest authentication is not enabled by default, so any device on the LAN can control the plug.
Its 15A protection also trips on high inrush loads, and the rating distribution shows 15 percent one-star reviews reporting random power-offs and firmware lock-ups.
Who the Shelly suits
Home Assistant users and anyone privacy-conscious who wants the automation to run on their own network. Schedules, timers and configurable power-on state all work without a vendor backend.
Matter support also means it joins Apple Home, Google Home and Alexa alongside a local setup.
Who the Shelly does not suit
People who want it to work perfectly out of the box with zero configuration. Two settings need changing before a heater schedule is trustworthy.
If your load has a large startup inrush spike, the protection may trip on startup even though steady-state draw is within range.
11. Tapo Matter Smart Plug P110M 4-Pack – Best for Off-Peak Rates
Tapo Smart Plug, Matter Compatible, Energy Monitoring, P110M(4-Pack), 15A
15A / 1800W
Matter certified
Energy tracking with bill estimation
Wattage thresholds with cut-off duration, four plugs
Pros
- Matter certified for Alexa
- Apple HomeKit
- Google Home and SmartThings
- Schedules move high-draw appliances to off-peak rates
- Energy monitoring with statistics and bill estimation
- Strong 2.4GHz connection that holds through concrete walls
- Reliable instant on and off once configured
Cons
- Bulkier than expected and can block the adjacent outlet
- Matter pairing can need several attempts or a reset to go local-only
- No way to lock out manual or app turning-off of the outlet
- App data storage limited to about three months without an Excel export
The P110M is the Matter-certified option with the strongest documented connection behaviour. Owners report strong 2.4GHz that holds through concrete walls, and several specifically compare it favourably to plugs that kept dropping off the network.
It is rated 15 amps and 1800 watts with normally open copper contacts, and the reason it earns a place here is programmable scheduling designed to move high-consumption devices to off-peak rates. Heating a room with a portable heater overnight while the tariff is cheap is one of the clearest savings available in this whole guide.
Overcharge prevention adds user-defined wattage thresholds and cut-off durations, so you can set a ceiling above the heater’s normal draw and have the plug act on a sustained overload.
Matter support also means owners can move these out of the Tapo ecosystem and into Home Assistant, and the energy data lines up with Home Assistant history for anyone cross-checking.
The four plugs are 1.5 by 1.5 by 2.6 inches, which is chunkier than a mini plug. On a multi-plug adapter that bulk can block the neighbouring outlet, which is worth checking before ordering a full set.
Who the P110M suits
Households on a time-of-use tariff who want the heater running overnight on cheap rates and never during peak pricing.
Matter households that want one device across Apple Home, Alexa, Google Home and SmartThings, plus energy cost visibility without a separate meter.
Who the P110M does not suit
People who need the heater to be unable to be switched on by mistake, because there is no lockout for manual or app turning-on. That is a real gap for unattended heating.
Anyone wanting more than about three months of stored history in the app has to export to Excel, and Matter pairing can take repeated attempts.
12. DIGITEN Wireless Thermostat Outlet – Best Without an App
DIGITEN Wireless Thermostat Outlet 1800w for Space Heater, Fan, AC
15A / 1800W maximum load
RF remote with built-in sensor
Separate input and output sockets
Backlit LCD
Pros
- Plug-and-play with no complex programming or account setup
- Switchable between heating and cooling modes
- Corded plug design leaves the second outlet on a duplex receptacle usable
- Wireless remote sensor needs no probe wire through a door seal
- Handles 750W space heaters without the switch getting more than slightly warm
Cons
- Remote AAA batteries last about two to three weeks and are not included
- Hysteresis is wide and the unit must drop roughly 3 degrees C below setpoint before restarting
- A few reports of the receiver dropping its wireless link
- Support response is described as unhelpful
The DIGITEN WTC1001 is the simplest thing here. There is no app, no account and no Wi-Fi. You get an outlet receiver, a wall-mounted panel with a backlit LCD, a tabletop kickstand, and an RF remote with a built-in temperature sensor that you place wherever you want to measure.
Because the sensor is wireless, you can close a mini-fridge or a door and still have an accurate reading, which wired probes cannot manage. Temperature is switchable between Celsius and Fahrenheit, and there is adjustable hysteresis with a compressor protection delay.
The design detail that matters for heaters is separate input and output sockets, which the manufacturer uses to reduce current temperature rise at the switch. Owners running 750W space heaters report it stays no more than slightly warm.
It is FCC certified and rated 15 amps and 1800 watts maximum load. Widely used to cut portable heaters, window air conditioners, mini-fridges and evaporative coolers at a setpoint.
There are real trade-offs. The remote takes two AAA batteries that last roughly two to three weeks and are not included, so this is a routine maintenance item. The default hysteresis gap means the unit must drop about 3 degrees C below setpoint before it restarts heating, which some owners find too coarse.
Who the DIGITEN suits
People who want thermostat behaviour without handing an account to a vendor or troubleshooting a Wi-Fi join at the wall. It works the day it arrives.
It is also a good fit for a room where the outlet is a duplex receptacle you need to keep half of.
Who the DIGITEN does not suit
Anyone who wants remote access from outside the home or voice control. There is no app, so no phone control outside the room and no Alexa or Google Home integration.
Reliability on compressor loads is questioned by a few owners, since startup current exceeds the 15A receiver rating even when steady-state draw does not.
How to Turn a Smart Plug Into Thermostat Behaviour?
A smart plug is binary. It has no idea what the room temperature is, so left alone it will heat until you switch it off and then sit there cooling. Pairing it with a temperature sensor is the fix, and it takes about ten minutes.
Place the sensor correctly. A sensor behind the heater reads the machine, not the room. Put it at seated head height on the opposite wall from a window.
Set a differential, not a single threshold. If your plug can do it, set a deadband of two to three degrees so it does not short-cycle. If it cannot, choose a plug that can: the meross MTS960 and the DIGITEN outlet both do.
Give it a hard upper limit. The Tapo P115 and P110M accept wattage thresholds with a cut-off duration, so an unexpected spike stops the outlet instead of the outlet absorbing it.
Build the routine in one direction only. Off at bedtime, off above the set temperature, off when nobody is home. Never on.
Verify it in person. Sit in the room during the first full cycle and confirm the heater actually cuts out before you trust the automation overnight.
On running cost, the arithmetic is simple enough to do in your head. A 1500W heater uses 1.5 kilowatt-hours per hour. Multiply by your utility rate, and a 1000W heater costs roughly two thirds of that per hour. Run either continuously for 24 hours and you have spent somewhere between the price of a large coffee and a good takeout, depending entirely on your tariff.
An energy-monitoring plug turns that estimate into a measurement, which is why the KP115, the P115 and the P110M earn their place on a heating list rather than a lighting one.
On ecosystems, the split is straightforward. Alexa and Google Home cover most of these plugs. Apple Home needs Matter, which points to the KP125M and the P110M. Home Assistant users get the most out of the Shelly, since it is discovered automatically and runs locally with no cloud dependency.
For broader heating guidance, our guides to space heaters for large rooms and infrared heaters for workshops cover the units you would be plugging in, and the same load math applies if you are planning to heat a warehouse bay.
Buying Guide: Choosing a Smart Plug for a 1500W Heater
Load rating first, always. A 1500W heater at 120V is 12.5 amps. The continuous ceiling on a standard 15A receptacle is also 12.5A, which means you want a plug rated 15A and 1800W so there is margin for the inrush spike when the heater’s fan and element kick in together. The BN-LINK at 1875W and the eWeLink TH16 at 3000W give more; 1800W is the practical floor.
Safety listing, not brand reputation. UL and ETL are the two marks that matter, and eleven of these twelve carry one. A recognisable brand name helps, but the certificate on the housing is the actual evidence. If you cannot find a listing, assume there is none.
Never an extension cord. This is where most of the danger lives. A smart plug that cannot reach the receptacle without a cord means the heater is in the wrong place, not that the cord is acceptable.
2.4GHz Wi-Fi, and only 2.4GHz. Every Wi-Fi plug on this list except the Shelly and the YoLink is 2.4GHz only. A 5GHz-only network will not see them. More importantly, test signal strength at the outlet itself, since heaters tend to sit in the worst corner of a room for wireless coverage.
Form factor. A plug that covers the second outlet of a duplex receptacle gets moved to make room for something else. The EP10 at 2.36 by 2.03 inches and the KP115 at 2.62 by 1.57 inches both leave it usable. The Tapo P110M at 1.5 by 1.5 by 2.6 inches and the meross MTS960 at 7.8 by 8.4 inches do not.
Hub requirements. Nine of these twelve work with no hub. The YoLink needs one, and the meross and DIGITEN thermostat devices sidestep the question by using a probe and an RF remote instead of a cloud app.
Local control if the internet matters. Matter, LoRa and on-device scripting all keep working through an outage. That matters more for a heater than for a lamp, because the failure mode is a room that stays warm with nobody in it.
Check the manufacturer’s own guidance. TP-Link advises against pairing its smart plugs with heaters and AC units because of inrush current, and one owner reports arcing damage on an oil-filled radiator. Read the support page for your heater and your plug before wiring them together.
When not to use one at all. Skip the smart plug for 240V garage or workshop heaters, for hardwired baseboard heat, and for any heater sharing a circuit with other high-draw appliances. For baseboard heat you want a smart thermostat in the wall, not a plug. If your heater has a frayed or warm cord, replace the heater rather than automating it.
And if the heater already has a thermostat dial, a plug that only switches on and off will make the room overshoot every cycle. That is the moment a temperature controller like the meross MTS960 starts to earn its extra complexity.
Frequently Asked Questions
Can you use a smart plug for a heater?
Yes, provided the plug is UL or ETL listed and rated 15 amps and 1800 watts at 120 volts, and the heater plugs directly into it with no extension cord or power strip in between. A 1500W heater draws 12.5 amps at 120V, so a 12.5A-rated plug leaves no headroom for startup inrush. Put the heater alone on a dedicated 20A circuit.
What size breaker do I need for a 1500 watt heater?
A 1500W heater at 120V draws 12.5 amps, so a standard 15A circuit is the minimum, and a dedicated 20A circuit is the safer choice. The reason is that the heater already sits on the 12.5A continuous ceiling that the 80 percent NEC rule sets for a 15A receptacle, leaving nothing for anything else sharing that circuit.
How much does it cost to run a 2000 watt heater for 24 hours?
A 2000W heater uses 2 kilowatt-hours per hour, so 48 kilowatt-hours over a full day. At a typical residential rate that works out to roughly 7 to 15 for the day depending on your tariff and time of use. A 1500W heater uses 36 kilowatt-hours over the same period, about a quarter less. Scheduling the plug for off-peak hours cuts this further.
What is the best smart outlet for Home Assistant?
For heater duty, the Shelly Plug US Gen4 is the strongest pick because Home Assistant discovers it automatically on pairing and its schedules and scripting run locally with no cloud dependency. It is rated 15A and 1800 watts and UL certified. The Tapo Matter P110M is a good alternative if you want Apple Home and energy cost tracking in the same device.
Which smart plug is better, Govee or Kasa?
For a space heater, Kasa wins on evidence. Both the Kasa EP10 and the Govee H5080 are rated 15 amps at 120 volts, but the Kasa carries a UL certificate and has a 4.5 average across more than 40,000 reviews, against Govee’s 4.6 across about 6,000. The Govee does have Bluetooth fallback, which the Kasa lacks.
Which smart electric heater is the best?
A heater with a built-in thermostat will always beat a smart plug, because the plug only switches on and off while a thermostat modulates around a setpoint and stops the overshoot. A Wi-Fi-enabled oil-filled radiator or a fan heater with a digital thermostat gives you scheduled and remote control without adding a plug between the wall and the heater.
Do smart plugs get hot when running a heater?
A plug that gets slightly warm at 1500W is normal and reported by owners across several models. A plug that is too hot to keep a hand on for a second, discolours, smells, buzzes into a crackle, or makes the receptacle loose is a failure and should be unplugged. Any heat beyond mild warmth on a 15A-rated, UL-listed plug is not normal.
Should a space heater be scheduled to turn on automatically?
No. Automating a heater to switch itself on while the house is empty is the one scenario nobody should build. Schedules that cut power at bedtime, shut off above a set temperature, or disable the outlet when nobody is home are safe because they reduce runtime. Always verify the first full cycle in person before trusting an overnight routine.
Conclusion
The Kasa Smart Plug Ultra Mini EP10 is our pick for the best smart plugs for space heaters overall: 15 amps, 1800 watts, a UL certificate, a body that leaves the second outlet free, and the deepest review history of anything on this list.
If you want to see what the heater costs, the Kasa KP115 adds real-time energy monitoring to the same load rating. For thermostat behaviour rather than on and off, the meross MTS960 with its 79-inch probe is the only device here that holds a room temperature instead of overshooting it.
Whatever you pick, keep three rules. Use a listed 15A and 1800W plug, plug the heater directly into the wall with nothing in between, and automate the off, never the on.