8 Best Smart Thermostat for High Voltage (2023)

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If you want to fully control your indoor home temperature, then getting a high-voltage smart thermostat might be the next step you need in your home improvement journey!

Whether you want to remotely control your fan/ceiling heating system or your electric baseboard, installing a smart thermostat for high voltage can be a great move. 

With an exhaustive list of smart home devices, 2023 is all about possibilities! Sometimes a lot of variety makes it difficult for us to choose the best product for our homes. 

Worry not, because in today’s article we will provide you with a list of the best smart thermostats for line voltage, which will make your decision a well-informed one!

Difference between a High Voltage Thermostat and a Low Voltage Thermostat?

High Voltage vs Low Voltage Thermostat

Electrical appliances and circuits that operate at voltage less than 50V are considered Low Voltage. On the other hand, High Voltage/Line Voltage appliances or circuits operate at 120V.

A High voltage/Line voltage thermostat is often used for baseboard heaters, electric space heaters, including a direct-wired electric furnace, or any other heater in general. These thermostats are simple to install as compared to the low voltage ones.

High Voltage Thermostats have lesser number of wires required for installation as compared to the Low Voltage thermostats. This makes installation simpler and reduces the overall complexity of the entire system.

What is the Best Smart Thermostat for High Voltage?

1. Stelpro Z-Wave Plus KI STZW402WB+ Thermostat (White) for Electric Baseboards and Convectors


First up on our list of smart thermostat for high voltage is the Stelpro KI, which works on Z-wave technology.

Efficient and Smart Heating

Since you can remotely control your convertor heaters and baseboard using your mobile device, this helps save a lot of energy. 

Efficiency is really great with Stelpro Z-Wave Plus KI! This is because you can set your own temperature schedules. 

Not only that, but this smart thermostat also has an Eco-Mode, which makes the smart device go into power-saving mode. This can reveal the true potential of this smart thermostat and save you a lot of bucks!

Works on Z-wave technology

There are very few Z-wave thermostats that work with line voltage. The Stelpro KI is one of them which works with a 2-wire connection to the heater! 

This makes integration with other devices easier and remote accessibility

Climate Control made simple

With this line voltage smart thermostat, you can move a step ahead and achieve advanced climate control. This can be done by integrating it with other Z-wave devices.

 For instance, you can turn the heating on or off based on the status given by another temperature/window/motion sensor, etc. This gives it an edge over others making it one of the best high-voltage smart thermostats

  • The backlight of the display can be controlled
  • Compatible with electric baseboard heaters and convectors up to 4000W for 240V and 2000W for 120V
  • Can be integrated with other Z wave devices through a Z wave gateway
  • Can be remotely controlled from anywhere
  • No need for batteries, it is wired directly to the power source
  • Not compatible with heaters that have fan-like fan-forced heaters
  • Does not work with Amazon Alexa
Check Price on Amazon


2. Honeywell Home 5-2 Day Programmable Thermostat for Electric Baseboard Heaters


Honeywell thermostats operate in a very simple manner. These thermostats can operate even without an active internet connection. I personally admire Honeywell due to its affordable price and lesser complexity. Honeywell manufactures numerous thermostats which are suitable for different applications.

If you are looking for the best high voltage thermostat,  then the Honeywell Home RLV4305A1000 smart thermostat can be the perfect one for you. If you are looking for an affordable choice, then this smart thermostat is the perfect one for you!

Electronic temperature control 

The built-in temperature control of this thermostat makes it easier for you to control precise temperature. Precision can be achieved up to ±1 F. 

This can save up to an additional 10% on heating bills.

7-day programmable feature

Another interesting feature of this smart line thermostat is that you can differently program it for all days of the week. This means that you can have different settings pre-set for different days.

You can modify the temperature according to your routine on different days, which can save a lot of energy.

Soundproofed for quiet operation

Interestingly, this smart thermostat is soundproofed, so its operation is less noisy as compared to conventional thermostats. 

On top of that, it can a reduce clicking noise commonly which is mostly heard in conventional thermostats.

Early start and quick operation

The Honeywell smart thermostat quickly maintains the set temperature within the time programmed inside it. This makes your home’s heating consistent and reliable. 

Moreover, the smart thermostat has a large backlit display, which makes it easier to operate by the user. The temperature values and other widgets are easily visible even from a distance. All these features make it the best Honeywell line voltage smart thermostat.

  • It is easy to program
  • The price is really affordable
  • Saves energy in a lot of ways
  • Has a one-year-long warranty
  • Does not support any voice assistants
Check Price on Amazon


3. ELV4 Lux Products Line Voltage Programmable

Lux is a leading brand in producing home-improvement products for a long time. The Lux ELV4 thermostat is one of the best smart thermostat for high voltage that is suitable for your home. Let’s explore how.

Dual Voltage; a necessity

You need it, Lux has got it! The dual-voltage (120V and 220V) feature ensures that the lux thermostat runs in regions where the home voltage is 120V and also where it is 220V.

This means that this smart line voltage thermostat will run both in North America as well as in the rest of the world. 

Programmable with different modes

The default heating mode of the Lux thermostat saves up to 33% of energy. However, it can be customized and even greater efficiency can be achieved by switching between different modes on different days of the week.

During the day, there can be 4 different program periods. At these periods, you can differently set values of temperature.

Moreover, you can set different settings for weekdays and weekends. This is truly helpful 

The Temporary temperature override

You can also extend the programming to another level; by making use of vacation hold mode. This helps further decrease electricity consumption, fulfilling your main goal.

You can also manually set the temperature at any time.   

The extended flexibility of programming includes a vacation hold setting and a temporary temperature override for manual adjustments.

  • 4 program periods per day
  • Dual voltage availability
  • Comes with a default program that can be used to save energy up to 33%
  • Separate programs for weekdays and weekends
  • The battery can be accessed and replaced from the front
  • The digital display is small
  • No backlight for the display
  • Loud relay clicking noise every time the thermostat goes on and off in a day
Check Price on Amazon


4. Sinopé Smart Wi-Fi Thermostat for Electric Heating

The next cool smart thermostat on our list is the Sinope Smart Wi-Fi thermostat. 

Compatibility is remarkable

It is not an exaggeration to say that this smart thermostat is made solely for electric heating; hence it works with baseboard heaters, radiant ceiling heaters, and fan-forced connectors. 

The amount of compatibility gives this smart thermostat a leading edge over others.

This smart thermostat is designed to work on 240-line voltage and is compatible with 2 or 4-wire connections. I personally believe that this smart thermostat shall be your choice if you have doubts about your heating system’s compatibility with other thermostats. 

Seamless Integration with Smart Home Assistants

Integration is another plus point of this smart thermostat. Not all line voltage smart thermostats provide integration with smart home assistants. 

However, the Sinope Smart wi-fi thermostat works with Google Home, Amazon Alexa, and with Apple Homekit. This feature carries immense importance in 2023, as we are living in the age of integration.

This gives you immense control over your home’s temperature, as you can turn your heating system by giving just a voice command. This feature makes Sinope one of the best smart thermostat for high voltage.


Remote access and great energy saving

The Sinope Smart Wi-fi smart thermostat can easily be controlled using the Neviweb app.
The app will allow you to pre-program an 8-day temperature schedule. Apart from that, the app also enables you to use the Geofencing feature of this smart thermostat. This will turn off the heating system automatically when you are not home. 

This feature itself saves a lot of energy, as heating is done only when required and turned off when you are away. On top of that, the app generates energy reports (tracking your consumption and savings in real-time). Overall, I would say that Sinope is a great smart thermostat for high voltage systems.

  • Perfect for up to 4000W heaters
  • Has a 3-year long warranty
  • Can easily be integrated with smart home assistants like 
  • Does not run on 120V

Check Price on Amazon


5. Mysa Smart Thermostat for Electric in-Floor Heating


Next up on our list is the branded Mysa Smart Thermostat. This is a remarkable smart thermostat for high voltage and here are the reasons why. 

A good range of high voltages

What’s remarkable about this smart thermostat is that it provides a range of high voltages. The Voltage ranges from 120V to 240V. 

This means that it is suitable for North America (with 120V) as well is for users from the rest of the world (240V).

Generally, this smart thermostat is designed for electric underfloor heating and is compatible with most of the electric heaters available in the market. However, it must be taken into consideration that Mysa smart thermostat does not work with water-based heating systems.

Quick Installation

Another reason why I have included Mysa in the list of best smart thermostats for line voltage is that it is really easy to install. 

The installation process takes around 20 minutes and there are a lot of online guides/videos available for the installation process. 

Another Integration Giant

Like the Sinope smart lock listed above, Mysa smart thermostat works with all popular smart home assistants including Google Assistant, Alexa, and Apple Homekit.

Such a feature will give you full control over your home temperature, as you can give voice commands to increase or decrease the temperature while sitting on your favorite couch!

Can Easily be connected to your Home Wi-Fi for remote access

Mysa smart thermostat is Wi-Fi enabled, and can easily be connected to your home wi-fi without any additional hub.

This means that you can control the smart thermostat remotely using the Mysa app. You can also set up heating schedules using the app and what’s cool about is the IFTTT features, through which you can program it on different triggers. 


This means that the Mysa smart thermostat creates a location boundary to determine whether you are in your home or not.
It shifts between home and away mode based on your phone’s location.  
Moreover, it also has a vacation mode for saving electricity while you are away on your vacation.

  • Can easily be connected to home wifi-no additional hubs required
  • Mysa smart app available for controlling and pre-programming
  • Compatible with all popular smart home assistants like Alexa, Google Assistant, and Apple HomeKit
  • Wiring might be a little tricky

Check Price on Amazon


6. King ESP230-R Electronic Line-Voltage Programmable Thermostat

In the realm of high-voltage smart thermostats, King thermostat certainly holds a spot as it is made especially for this purpose.

Accuracy is utmost

The King ESP230-R has a unique sensing technology that makes temperature readings extremely accurate.
Since it takes accurate temperature readings, it knows precisely when it has to switch the heating system on or off.

Apart from that, the King smart thermostat has OTA firmware updates which keep the thermostat updated with the latest improvements and bug fixes in the firmware. 

Smart app control 

The King smart app will let you pre-program the smart thermostat for 7 days. 

You can set the heating schedule for every day of the week and won’t have to even touch or worry about your thermostat or heating system for the entire week. 

You can manually set the temperature and check electrical savings as well. 

But here’s an issue

“With great power comes great responsibility”.

 Going by this quote, there lies an additional responsibility (on manufacturers) of integration with smart home assistants. 

Unfortunately, the King smart thermostat is not compatible with any smart home assistant. 

Therefore, if you don’t have to connect your smart thermostat to you voice assistant, King smart thermostat will be suitable for you. Otherwise, I would recommend you one of the other thermostats listed in this article.  

  • Has multi-zone support.
  • Accuracy is up to ±1 degree Fahrenheit.
  • Comes with over-the-air (OTA) software updates.
  • Doesn’t work with Smart Assistants like Google Assistant, Amazon Alexa, or Apple HomeKit.
  • A bit expensive

Check Price on Amazon


7. nVent NUHEAT SIGNATURE Programmable WiFi Dual-Voltage Thermostat


Has Dual Voltage

One of the major features required in a Smart thermostat for high voltage is the ability to operate on different voltages. 

The nVent NUHEAT thermostat has this feature. It is suitable for North America (where the home voltage is 120V), as well as for the rest of the world. 

Moreover, the smart thermostat comes with GFCI protection. This protects you from electrocution by detecting and preventing any possible current leakage.

Easily Programmable

This smart thermostat allows you to make your own schedule over the week. You can program it differently for all 7 days. 

This can reduce electricity costs as it can save a significant amount of energy.

Wifi enabled; provides remote access

The nVent NUHEAT SIGNATURE line voltage thermostat is fully wi-fi enabled. You can remotely control your heating system from anywhere using the Nuheat Android or iOS app.

You can change your thermostat’s temperature, and turn it on or off from anywhere in the world. This makes it one of the best smart thermostat for high voltage.

Integrates with Nest

Another cool thing is that it integrates with Google Nest learning thermostat. However, support for Alexa or Apple HomeKit is not available. 

Comes with a 3-year Warranty

Another thing I highly appreciate about this smart thermostat is that it comes with a 3-year warranty. This increases the customer’s trust level on the brand and adds to the reliability and durability of the product.

  • It is compact
  • Easy installation
  • Provides remote access via wifi and smartphone apps
  • Support for dual voltage (120V and 220V)
  • Slightly costly

Check Price on Amazon


8. Schluter DITRA-HEAT-E-WiFi Thermostat

Last, but not least, we have Schluter DITRA Heat E-Wifi smart thermostat for high voltage.

Wifi and remote access 

Just like some other line voltage thermostats in the list, the Schuler smart thermostat is wifi enabled which means it can be controlled remotely using the Schluter smartphone app. 

Floor warming done right

The Schluter DITRA-Heat WiFi thermostat is great for floor heating. You can set your temperature according to your custom requirements. 

A cool 3.5 inches display 

The display screen is a high-quality touch-enabled one, which displays local temperature and weather forecasts as well. 

Dual Voltage Support

The Schuler Smart thermostat provides dual voltage as it supports both 120 V and 240 V cables.

This is a must-have trait in all smart thermostat for high voltage.

Programmable and energy efficient

 Since energy saving is the main goal with all smart thermostats, it is no surprise that Schuler smart thermostat provides ways in which we can achieve it!

The smart thermostat is fully programmable with 6 programming periods per day. This gives you the ability to set different settings for different times of the day, saving a lot of energy. 

Apart from that, the Schluter smart thermostat also allows you to track energy consumption throughout the month. 

Check Price on Amazon


To sum it up, smart thermostat for high voltage are a great way to save electricity and decrease your electricity bills by a subsequent amount.

All the line/high voltage smart thermostats listed above can be installed in your homes taking into account the voltage requirement.  

I believe the dual voltage smart thermostats have an edge over others, but at the end of the day, if a smart thermostat fulfills your precise requirements, it is good to go. I hope you make an informed choice.

Thanks for reading!

Stefen Turner

Hey! My name is Stefen and I am the founder of Smart Home Hunt. Prior to starting this blog, I used to work as a Full-Stack Web Developer in the field of Internet of Things (IoT).

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