5 Best Line Voltage Wifi Thermostat for Heating Control [Tips and Shopping GUIDE]

In Home Automation Devices by Christy

Our Top Pick:

Best Overall: Mysa Smart Thermostat

Mysa

We chose Mysa Smart Thermostat as the overall best line voltage wifi thermostat because of its ease-of-use and compatibility with smart home devices. It comes with a modern and sleek design that can fit to any part of your home!

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Winter is coming soon and you might start to worry about your high heating bills. If you’re using multiple thermostats to control the climate in every room in your house, why not make them smarter to save on your energy cost?

No need to spend hours researching or looking for the right products. We’ve summarized the best line voltage wifi thermostats.

Compare the Best Line Voltage WiFi Thermostat

Best for Electric Baseboard Heaters
Best for Z-wave Devices
Best for Accurate Temperature Control
Best for Geofencing Feature
Best for Home Automation
Product
door strike plate
Mysa Smart Thermostat for Electric Baseboard Heaters
door strike plate
Stelpro Z-Wave Plus KI STZW402WB+ Thermostat (White) for...
door strike plate
KING K902-B Hoot WiFi Line Voltage Smart Programmable...
door strike plate
Stelpro ASMC402 Smart Home Wi-Fi Controller Thermostat Adds...
door strike plate
Sinopé Smart Wi-Fi Thermostat for Electric Heating TH1124WF...
Smart home integration
Yes
Limited
Limited
Yes
Yes
Thermostat wiring
Single pole
Single and double pole
Double pole
Double pole
Single and double pole
Voice control
Yes
No
No
No
Yes
Warranty
2 years
3 years
1 year
3 years
3 years
Best for Electric Baseboard Heaters
Product
door strike plate
Mysa Smart Thermostat for Electric Baseboard Heaters
Smart home integration
Yes
Thermostat wiring
Single pole
Voice control
Yes
Warranty
2 years
Best for Z-wave Devices
Product
door strike plate
Stelpro Z-Wave Plus KI STZW402WB+ Thermostat (White) for...
Smart home integration
Limited
Thermostat wiring
Single and double pole
Voice control
No
Warranty
3 years
Best for Accurate Temperature Control
Product
door strike plate
KING K902-B Hoot WiFi Line Voltage Smart Programmable...
Smart home integration
Limited
Thermostat wiring
Double pole
Voice control
No
Warranty
1 year
Best for Geofencing Feature
Product
door strike plate
Stelpro ASMC402 Smart Home Wi-Fi Controller Thermostat Adds...
Smart home integration
Yes
Thermostat wiring
Double pole
Voice control
No
Warranty
3 years
Best for Home Automation
Product
door strike plate
Sinopé Smart Wi-Fi Thermostat for Electric Heating TH1124WF...
Smart home integration
Yes
Thermostat wiring
Single and double pole
Voice control
Yes
Warranty
3 years

Single Pole vs Double Pole - Which is Better?

When you look at the back of your line voltage thermostat, you will see some wires which are intended to connect it with your heating system. You will see that a line voltage thermostat can have two different wiring configurations - the single pole and double pole. Although both of these thermostats work great in regulating your home temperature, they function in a slightly different way when connected to your heating system.

Single Pole

Single pole thermostats only require two wires to connect to your heating system’s service line. Although it can control your heating system, it cannot completely turn it off when not in use. Thermostats connected in single pole wiring can only turn your heater on the lowest setting to conserve energy.

Double Pole

Unlike single pole thermostats, double pole thermostats have four wires to connect to your primary circuit breaker. This wiring configuration can work on two different circuits and can turn off the power line from either of the circuits. This means that it can act like a switch button so you can turn off your heater when not in use.  

So if you’re looking for a smart thermostat that can help you conserve more energy in the long run, then the double pole thermostats work best for you.

How We Choose and Must-Have Features

Line voltage wifi thermostats can be more expensive than the traditional ones. But they offer a lot of features that could be beneficial to your home in the long run.

Choosing the best line voltage wifi thermostats can be daunting, especially if you don’t know what features to look for.

So before you scroll down our list and make a decision, here’s a summary of the must-have features we considered for the best line voltage wifi thermostat:

Energy Efficient

We all want smart devices in our homes for one common reason - to save energy. Smart thermostats provide features that allow you to customize the heating levels in your room to keep you warm and cozy without wasting energy. So when reviewing a line voltage wifi thermostat, consider how much energy savings you can get since not all smart thermostats are made equal. 

Scheduling Features

Line voltage wifi thermostats generally work in multi-zone systems so you can control each of your thermostats installed in different rooms. You can change the settings and schedule adjustments in one go instead of adjusting each of the thermostats every time.

Remote Access

Most line voltage wifi thermostats come with an app so that you can access your device right on your mobile phone. Whether you’re still in the office on your way home or on a long vacation, you can adjust and monitor your home climate anytime and anywhere you are.

Zoning Settings

The great thing about having line voltage wifi thermostats is that you can easily regulate the climate in every room with different preferences. This feature can even lower the heating level in rooms that are not used. Zoning provides flexibility and convenience while helping you save on energy cost.

Best for Electric Baseboard Heaters: Mysa WiFi Smart Thermostat

Mysa is your best choice if you want to integrate a voice control. Comes with extensive guides for easier installation!

Pros

  • Easy to install with extensive guides
  • Minimalist and modern look
  • Supports IFTTT
  • Works well with Alexa, Google Assistant, and Apple HomeKit

Cons

  • Needs a manual reset when cut during a power shortage
  • Incompatible with 12-24 V systems

Customer Reviews

“Finally, the smart device I've been looking for — honestly! Just about every (if not all) other smart thermostats are for heat pumps, HVAC, furnaces, etc — not for baseboard heaters. The design's really simple and elegant — it looks great on the wall. My Mysas were super easy to install and set up, and I've never replaced a thermostat before in my life."
Zippo

Planning to ditch your old thermostat and switch to a smart line voltage thermostat for the first time? Then you will love the Mysa wifi thermostat for your smart home. It’s easy to install with loads of support online (in case you get lost somewhere) so you don’t need extra help from a professional. 

This smart device is enclosed in a sleek and minimalist design so if you’re a little worried about whether the device fits well to your wall decor, then you’ll find Mysa blends well.

A lot of smart home devices like Alexa, Apple HomeKit, and Google Assistant work well with Mysa. The device also works well with IFTTT to cater to your preferred routines. You can even set it on vacation mode to further save on your energy bills. Or activate the geolocation feature to let the device know if you’re home or not and avoid wasting energy in an empty house.

Best for Z-Wave Devices: Stelpro Z-Wave Plus KI STZW402WB+

Stelpro offers compatibility for most z-wave devices. One of the downsides - it doesn't support Alexa.

Pros

  • Compact and stylish design
  • Compatible with Z-wave devices
  • Comes with a clear LCD display and backlight display
  • Works well with most electric baseboard heaters and convectors

Cons

  • Does not support Alexa
  • You can’t completely turn off the heater
  • Not compatible with fan-forced heaters

Customer Reviews

“This thermostat is AWESOME! It's the first 220v thermostat to support z-wave (4/2016). I am using 3 of them with my Nexia system, which supports z-wave devices. For you Nexia users, I think you will be very pleased. I haven't tested it with other z-wave systems, but comments on the Nexia support site indicate that users of other systems are pleased as well.”
SavvyShopper

Love to integrate your smart thermostat with Z-wave devices? Then look no more - the Stelpro Ki is the only popular Z-wave line voltage thermostat you can find for your home automation system.

It may not come with a lot of fancy features like the other thermostats but it works reliably and follows your commands. So if you love home automation devices, then this simple device could be the best fit.

Aside from the Z-wave, Stelpro Ki is also available in a Zigbee version. Choose whichever protocol will work best with your network.

Another interesting bonus you can get with Stelpro Ki is that it is designed with carbon monoxide and smoke detectors. Stelpro wants to ensure not just a comfortable climate for your home but your health and safety too! So when harmful gases are detected, it turns the HVAC system on to remove the gases. 

Other features include a minimalist design to suit your interior and the Eco mode to maximize your energy savings. 

Best for Accurate Temperature Control: KING K902-B Hoot WiFi Thermostat

Want precise control on your home temperature? Then King Hoot is your best bet. But be prepared to pay a higher price!

Pros

  • Highly accurate thermostat at ±1 degree Fahrenheit
  • Multi-zone support
  • OTA (over-the-air) software update feature
  • Large LCD touchscreen display

Cons

  • Not compatible with Google Assistant, Amazon Alexa, and Apple HomeKit
  • Expensive

Customer Reviews

No reviews available

Looking for a highly reliable line voltage thermostat with accurate temperature readings? Then you should consider the KING K902-B Hoot wifi thermostat.

King Hoot is based in the US and has been popular for their electric heating devices since the 1950s. With the wifi-based King K902-B, you can be assured of a well-built thermostat to keep your home climate at the most comfortable level.

No need to worry about wiring configurations - King Hoot works both as a single or double pole connection. It can even support most convectors, baseboards, and fan-driven heaters.

The multi-volt rated thermostat also comes with a large LCD touchscreen display to check your current settings in real-time. If you love devices with convenient large displays, then King Hoot is your best bet.

Best for Geofencing Feature: Stelpro ASMC402 Smart Home WiFi Controller Thermostat

The Stelpro ASMC402 helps you save energy through its geofencing feature. It works perfectly with Alexa and Google Assistant, too!

Pros

  • Geofencing feature to save energy
  • Supports up to 19 Stelpro devices
  • Works well with IFTTT
  • Can be connected via Zigbee
  • Compatible with Google Assistant and Amazon Alexa

Cons

  • Inaccurate temperature readings
  • Misconnection of wires can cause heating of the device

Customer Reviews

“This is the ideal thermostat to remotely control the electric baseboards in our backyard gazebo. From the inside of our house … we setup the heater temperature of our gazebo … which extends the usage of it late fall an early spring. 🙂 🙂 ”
Jean-Claude Larochelle

How many times have you wished your devices could automatically adjust your home temperature the moment your home? When you arrive at your doorstep, just go relax after a long day instead of worrying about manually setting your devices. 

The Stelpro ASMC402 can do the job for you thanks to its geofencing feature. When you’re not home, your heaters are automatically shut off, or when you are heading home, your devices are turning your heaters on to prepare a comfortable temperature before you arrive. Aside from automatically adjusting your home temperature, the geofencing feature also helps you save energy by turning off your heating system when you’re not home.

And if you have a large house with multiple rooms, then you can add up to 19 Stelpro thermostats for room-by-room adjustments.

However, the Stelpro ASMC402 doesn’t work with voice control. So if you’re a fan of voice-enabled devices, then this heater may not be for you.

Best for Home Automation: Sinopé TH1124WF Smart WiFi Thermostat

Want to integrate a smart thermostat into your home automation system? Then the Sinopé is a good choice. 

Pros

  • Highly reliable high-voltage smart thermostat
  • Works with 2 or 4 wire connections
  • Compatible with Amazon Alexa, Apple HomeKit, Google Home, and Neviweb
  • Compatible with most baseboard heaters, radiant ceiling heaters, fan-forced convectors, and convectors

Cons

  • Inaccurate temperature readings
  • Some customers complained of overheating of the device

Customer Reviews

“I have four Sinopé thermostats in my house now, two TH1124WF and two TH1123WF. They were easy to install, they work great with Google and Smartthings (Alex too) so you can control the temperature remotely.”
thesohoguy

Are you a big fan of home automation? Then you should consider adding the Sinopé TH1124WF thermostat to your ecosystem. The Sinopé TH1124WF works with most of the smart home devices such as Google Home, Apple HomeKit, Amazon Alexa, and Neviweb so won’t have any issues with smart home integration.

Aside from being a highly reliable line voltage wifi thermostat, the Sinopé TH1124WF device works well with convectors, fan-forced convectors, baseboard, and radiant ceiling heaters. You can even use it as a 2 or 4-wire connected device.

Other features available include scheduling, energy reports, geofencing, and personalized scenes. With all these features present in one product, the Sinopé TH1124WF is surely the smart way to control your heating system while saving on energy cost.

Our Key Takeaways

Line voltage wifi thermostats are great add-ons to your smart home system to save energy while maintaining a comfortable temperature. There are many line voltage thermostats available in the market and choosing the best one can be tricky. 

We hope you find this list helpful before clicking that add to cart button! 

Last update on 2021-11-28 / Affiliate links / Images from Amazon Product Advertising API