![KING K902-W Hoot WiFi Line Voltage Smart Programmable Thermostat, 120/208/240V, Double Pole, White : Amazon.ca: Tools & Home Improvement KING K902-W Hoot WiFi Line Voltage Smart Programmable Thermostat, 120/208/240V, Double Pole, White : Amazon.ca: Tools & Home Improvement](https://m.media-amazon.com/images/I/51jyK-fOTCL.jpg)
KING K902-W Hoot WiFi Line Voltage Smart Programmable Thermostat, 120/208/240V, Double Pole, White : Amazon.ca: Tools & Home Improvement
![electrical - Smart thermostat (high voltage) makes heater constantly on - Home Improvement Stack Exchange electrical - Smart thermostat (high voltage) makes heater constantly on - Home Improvement Stack Exchange](https://i.stack.imgur.com/vemtm.jpg)
electrical - Smart thermostat (high voltage) makes heater constantly on - Home Improvement Stack Exchange
![Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. : Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. :](https://i.redd.it/ab78rdsfeb9a1.jpg)
Do I have a high voltage system? The black and white wires are thicker. I couldn't find any other indication that it is high voltage. Just trying to add a smart thermostat. :
![Nuheat Signature Programmable Dual-Voltage Thermostat with WiFi and Touchscreen Interface, Works with NEST, Building Supplies - Amazon Canada Nuheat Signature Programmable Dual-Voltage Thermostat with WiFi and Touchscreen Interface, Works with NEST, Building Supplies - Amazon Canada](https://m.media-amazon.com/images/I/513-v2Tg+tL.jpg)