Best High Voltage Smart Thermostat [Top 10 line voltage thermostat]

We’ve spent a lot of time reviewing the best programmable thermostats as well as the best thermostats with remote sensors for larger homes, but recently something dawned on us.

One out of five homes in North America (a complete 20%!) has high voltage or line voltage HVAC systems that won’t work with the household names like Nest and Ecobee.

So we’re here to help anyone with baseboard heaters or other high voltage systems. Below we review the best line voltage smart thermostat so that you can bring your home into the 21st century.

High Voltage Smart Thermostat: Amazon Best Sellers

If you’re in a hurry, take a look at these Amazon Best Sellers. Otherwise, keep reading!

As an Amazon Associate I earn from qualifying purchases. Last update on 2022-08-09 from Amazon / Images from Amazon Product Advertising API


Mysa high voltage thermostat – The best line voltage smart thermostat?

In Swedish, Mysa means “comfortable” or “content.” And, this high voltage thermostat was designed to make your content and make your home temperature comfortable. Mysa is a smart thermostat meant to be used in homes that use electric baseboards or fan-forced heaters.

Baseboard heaters are, as their name suggests, installed on the baseboards of rooms. Usually, they are installed under windows to warm cool air and keep the room temperature cozy.

As an Amazon Associate I earn from qualifying purchases. Last update on 2022-08-09 from Amazon / Images from Amazon Product Advertising API

They work by transmitting electric currents through wires encased in piping. To be more precise, this means that a baseboard heater pulls cool air in, warms it with electricity, and then pushes hot air out.

One great benefit of using baseboard heaters is that this allows you to heat only the rooms in use, meaning that you will reduce heating costs. However, these heaters aren’t the best choice for homes that require high heating loads.

So, where does the Mysa high voltage thermostat come in? Its role is to connect all baseboard heaters to central control and allow you to manage the home temperature in every room.

Whom Is This Product Designed For?

  • Mysa smart thermostat can be used in homes with high voltage electric baseboard heaters and electric fan-forced heaters.
  • Thanks to its simple interface, users of all ages can adjust the temperature in their homes with the Mysa thermostat.

High-Quality Design

What impresses many users once they unbox the Mysa high voltage thermostat is its build quality. Even though the unit features a clean, modern design, it feels quite durable. And, when compared to a traditional thermostat, this one is noticeably larger. The size is justified by a giant heat sink used for cooling the controller and can be seen once the faceplate is removed.

The thermostat is composed of two parts – the power board and the faceplate. The power board is mounted to the wall, and the faceplate contains the controller board. One nice touch is that the manufacturer made sure to include mounting screws and wire nuts necessary for mounting the thermostat.

Simple Installation

Installing a Mysa high voltage thermostat is relatively simple if you have any experience in electrical work. For example, if you can establish a smart switch, you should have no problems with installing this thermostat.

Just like many other smart devices, this one also requires a neutral wire. So, you should make sure you have one available before even making the purchase. The thermostat comes with an instruction manual that covers the installation, and every step is explained clearly. In addition, the manufacturer made sure to provide an installation video on YouTube.

Easy to Use

Using a Mysa thermostat is very simple. The thermostat comes with two touch buttons that allow you to easily increase or decrease the room’s temperature. And, one great thing about it is that you can adjust this thermostat manually and remotely.

When it comes to remote control, this high voltage thermostat comes with an app compatible with Android and iOS smartphones.

The Mysa App

The Mysa app is straightforward to use, and it is quite convenient since it allows you to set the temperature in your home remotely. However, before you get started, you will need to create a Mysa account.

Besides being able to adjust your home temperature from anywhere in the world (literally), the app has a few more features. You can use it to view current temperature and humidity, create zones, and set schedules. The schedules can be made for different days of the week, and they can be set through a wizard or manually.

Another excellent part of the Mysa app is the ability to check out your energy usage by zone. This will help you stay comfortable while also keeping costs under control during those long, chilly stretches of winter.


  • The only HomeKit compatible line voltage programmable thermostat available.
  • Very easy to install and use.
  • Features sturdy build and appealing design.
  • The manufacturer is constantly releasing updates to improve functionality.
  • Compatible with smart home systems such as Google, Amazon Alexa, and Apple HomeKit.


  • This thermostat is expensive when compared to standard, programmable thermostats.
  • Some users stated that the touch buttons could be more responsive.
  • Some users have experienced long wait times before shipment.

As an Amazon Associate I earn from qualifying purchases. Last update on 2022-08-09 from Amazon / Images from Amazon Product Advertising API


How Many Amps Is Mysa Smart Thermostat Rated For?

The Mysa thermostat is rated at 16 Amps.

Does This Thermostat Work With Hydroponic Baseboards?

It does, as long as the hydroponic baseboard is self-contained. For the thermostat to work correctly with such baseboards, it should be set to the “fan-forced” setting.

What is the Lowest Temperature Setting?

The lowest temperature setting is 41 degrees Fahrenheit. There is also a complete off mode if you don’t want the heaters to turn on at all.

As an Amazon Associate I earn from qualifying purchases. Last update on 2022-08-09 from Amazon / Images from Amazon Product Advertising API

What is the best line voltage thermostat for you?

Mysa is a high voltage thermostat perfect for homes that use electric baseboards or fan-forced heaters. Like every other smart thermostat, it comes with an app that allows the user to remotely control the temperature in his home. In addition, the manufacturer is constantly releasing updates that improve the app’s functionality and the thermostat.

Homeowners with high voltage heating will love this thermostat because it doesn’t only add smart home functionality to their heating system. It is an excellent solution for those who would like to lower their energy consumption and heating costs. According to the manufacturers, all Mysa owners can save at least 15% on their energy bills.

As an Amazon Associate I earn from qualifying purchases. Last update on 2022-08-09 from Amazon / Images from Amazon Product Advertising API

High Voltage Smart Thermostat: Today’s Best Deal!

Save 22%Bestseller 1
King K101 Single Pole Line Voltage Thermostat, 120-277V, White
  • Clean, beveled style suits any decor Sits flush against wall Includes °C and °F Bi-metal sensing element Mounts directly to a 2x4 inch vertical electrical outlet box Fully vented cover allows air...
Save 11%Bestseller 2
Honeywell TL8230A1003 Line Volt Thermostat 240/208 VAC 7 Day Programmble
  • 7 day programmable - maintain the pre-set program schedule for up to 20% energy savings, or modify the schedule to fit your lifestyle. 208/240V
  • Electronic temperature control - precision of ±1 F saves up to an additional 10% on heating bills; 15 A (Resistive), 50/60 Hz, 4 Wires, Double Pole, 15 minute heating cycles, Battery Free
  • Soundproofed for quiet operation - reduces the clicking noise commonly heard with conventional thermostats
Save 9%Bestseller 3
Honeywell Home CT410B Manual 4 Wire Premium Baseboard/Line Volt Thermostat CT410B1017
  • Mechanical operation, non-programmable thermostat
  • Bi-Metal Temperature Sensor
  • 120 - 240 volt, 4 wire. Easy to install and use.Compatible with baseboards. Can control up to 5,280 Watts.
Save 8%Bestseller 4
Honeywell Home RLV3150A1004 Non-programmable Digital Electric Heat Thermostat for Electric baseboards and convectors
  • Easy to use - digital, push-button operation
  • High-capacity electronic thermostat (up to 3000W @ 240V)
  • Compatible with line volt heating only (240V) including electric baseboards, convectors, radiant ceilings and fan-forced heaters
Save 7%Bestseller 5
Honeywell TL7235A1003 Line Volt Pro Non-Programmable Digital Thermostat with Electronic Temperature Control, 240-Volt
  • On-Demand Backlight - Easy to read in various lighting conditions
  • Soundproof Operation - Reduces "clicking" noise heard with conventional thermostats
  • Heating Indicator - At-a-glance confirmation that the heat is on
Save 6%Bestseller 6
Robertshaw 803A Thermostat Line Voltage | SPST (Cooling)
  • Application: Cool Only
  • Programmability: Non-Programmable
  • Voltage: 120v 240v 277v
Bestseller 7
Honeywell Home RLV3120A1005 Digital Non-Programmable Thermostat for Electric Heat Only
  • Easy to use and install for home temperature control of electric heating systems
  • TRIAC switching for accurate temperature control of +/- 1 degrees Fahrenheit
  • Silent operation with no annoying clicking noise, making it ideal for all rooms including bedrooms
Bestseller 8
Line Voltage Thermostat, Heat Only, White
  • Programmability: Non-Programmable
  • Voltage: 120v 240v 277v
  • Temperature Range (F): 50°-90°F
Bestseller 9
Mysa Smart Thermostats (Electric Baseboard Heaters V2)
389 Reviews
Mysa Smart Thermostats (Electric Baseboard Heaters V2)
  • For High/Line Voltage Systems — Mysa works with 120-240V electric baseboards and electric fan-forced heaters and requires one neutral or second live wire.
  • 40% Smaller + New Features, Including Adaptive Display Technology.
  • Adaptive Brightness Technology - Use Sleep and Wake on Approach to Set Your Preferred Display Brightness

As an Amazon Associate I earn from qualifying purchases. Last update on 2022-08-09 from Amazon / Images from Amazon Product Advertising API