10 Best Line Voltage Thermostats 2025 in the United States

The Honeywell Home CT410B Manual 4 Wire Premium Baseboard/Line Volt Thermostat is a reliable choice for those seeking a straightforward and efficient heating control solution. This non-programmable thermostat is compatible with a variety of electric heating systems, including baseboards, convectors, and fan-forced heaters, making it versatile for different home heating applications. Its voltage compatibility ranges from 120 to 240 volts, accommodating different electrical setups easily.

One of the key features is its bimetal temperature sensor, which ensures stable and worry-free temperature control within a range of 40°F to 80°F. The mechanical knob offers simple manual adjustments, which can be a plus for those who prefer traditional controls over digital interfaces. Additionally, the CT410B supports double-line break, providing a positive off feature for safer operation and easy installation.

This model is suitable for controlling either a single heater or multiple heaters, as long as the combined load does not exceed 5280 watts. The Honeywell Home CT410B stands out for its simplicity, reliability, and ease of use, particularly for those who prefer a manual control setup without the need for complex programming.

The Mysa Smart Thermostat is designed specifically for high-voltage electric in-floor heating systems, supporting 120-240V and offering built-in Class A GFCI protection, which adds safety by reducing the risk of electrical faults. This makes it a good choice if you have a line-voltage system and want to upgrade to a smart thermostat. It is not compatible with water-based heating systems, so it’s important to ensure your heating matches this type.

The thermostat is fully programmable via a free mobile app, letting you control temperature remotely through Wi-Fi using Apple HomeKit, Alexa, or Google Home. This adds convenience and energy savings by allowing you to adjust settings anytime without manual intervention. The display is LED-backlit with touch controls on the unit itself, providing a modern look and easy interaction. Unlike some models, Mysa does not require a subscription for its smart features, which is a nice cost-saving bonus. It includes useful extras like vacation mode, daylight savings time adjustments, and lockable controls for safety.

Installation is relatively straightforward, with included mounting hardware and floor sensor. The product is somewhat specialized: it’s intended only for electric in-floor heating, so it won't fit other heating types or lower voltage requirements. If you are looking for a smart, reliable thermostat for electric floor heating with modern app integration and safety features, Mysa is a strong option. Just be sure your system voltage and heating type are compatible before choosing it.

The Honeywell TH1100DV1000 Pro-Digital 2-Wire Heat Only thermostat is a reliable choice for those needing a straightforward and efficient line-voltage thermostat. It operates on a 230-volt power source and features a single-pole design, making it suitable for basic heating systems like electric baseboard heaters.

This model is battery-powered, requiring two AAA batteries, which may need periodic replacement but offers the benefit of maintaining settings during power outages. The backlit digital display is easy to read and continuously shows the ambient temperature, providing clear visibility even in low light conditions. The temperature range of 40 to 90°F should be sufficient for most home heating needs, and the simple button controls make it user-friendly for those who prefer a non-programmable thermostat.

However, this thermostat may not meet the needs of users looking for advanced programmability or dual-pole functionality. Additionally, while the product is durable with its plastic build, the lack of included batteries might be a minor inconvenience. It is worth noting that this model is specifically designed for heat-only systems, which limits its versatility if cooling control is also required. The Honeywell TH1100DV1000 is best suited for users seeking a straightforward, easy-to-read, and dependable thermostat for basic heating applications.