KINGK902-B Hoot WiFi Line Voltage Smart Programmable Thermostat, 120/208/240V, Double Pole, 4-Wire, Black

I can't rave about this smart thermostat enough. It is expensive, but works flawlessly. I was corresponding with tech support for another smart thermostat company for 2 months and still never got it to connect to my system, where this connect immediately, reconnects automatically whenever the need arises, stays connected, is easy to program, runs my heater perfectly, etc., etc.Just perfect. Flawless. I'm one extremely satisfied customer.