![Installing new 2-wire (Single Pole) Thermostats - how to install when there are 3 wires in wall? - Home Improvement Stack Exchange Installing new 2-wire (Single Pole) Thermostats - how to install when there are 3 wires in wall? - Home Improvement Stack Exchange](https://i.stack.imgur.com/JmTci.jpg)
Installing new 2-wire (Single Pole) Thermostats - how to install when there are 3 wires in wall? - Home Improvement Stack Exchange
![CM2S - 10(3)A 230 & 24Vac Mechanical Room Thermostat, 2 Wire c/w On/Of — BEE - The SMART Heating Merchants CM2S - 10(3)A 230 & 24Vac Mechanical Room Thermostat, 2 Wire c/w On/Of — BEE - The SMART Heating Merchants](https://beetbg.com/cdn/shop/files/CM2S_3Quarter-BW-1-300x300_300x300.jpg?v=1689935279)
CM2S - 10(3)A 230 & 24Vac Mechanical Room Thermostat, 2 Wire c/w On/Of — BEE - The SMART Heating Merchants
![Temperature Controller, 2 Wire Room Thermostat Heating Thermostat Digital Thermostat with Large Screen LCD Display Wall Hanging for Control Room Temperature (White) : Amazon.co.uk: DIY & Tools Temperature Controller, 2 Wire Room Thermostat Heating Thermostat Digital Thermostat with Large Screen LCD Display Wall Hanging for Control Room Temperature (White) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/51pHACGPxJL.jpg)
Temperature Controller, 2 Wire Room Thermostat Heating Thermostat Digital Thermostat with Large Screen LCD Display Wall Hanging for Control Room Temperature (White) : Amazon.co.uk: DIY & Tools
![My heat-only system only has two or three wires connected to the thermostat. Am I compatible with ecobee? My heat-only system only has two or three wires connected to the thermostat. Am I compatible with ecobee?](https://storage.googleapis.com/article_attachments/227874667/rwcdiagram.png)
My heat-only system only has two or three wires connected to the thermostat. Am I compatible with ecobee?
![I currently have 2 wires coming from furnace. Ecobee says: Based on your wiring selection of Rh and W or W1 your home is compatible with ecobee, but you will need to I currently have 2 wires coming from furnace. Ecobee says: Based on your wiring selection of Rh and W or W1 your home is compatible with ecobee, but you will need to](https://preview.redd.it/rfv8w700xryz.jpg?width=640&crop=smart&auto=webp&s=486a23a998541bc1db46f9057315455e3b5411e8)
I currently have 2 wires coming from furnace. Ecobee says: Based on your wiring selection of Rh and W or W1 your home is compatible with ecobee, but you will need to
![Thermostat basic 2-wire control | Thermostat wiring, Refrigeration and air conditioning, Digital thermostat Thermostat basic 2-wire control | Thermostat wiring, Refrigeration and air conditioning, Digital thermostat](https://i.pinimg.com/736x/27/31/0a/27310a14d9605a285bf1d3757ead7794.jpg)
Thermostat basic 2-wire control | Thermostat wiring, Refrigeration and air conditioning, Digital thermostat
![Temperature Controller, 2 Wire Room Thermostat Heating Thermostat Digital Thermostat with Large Screen LCD Display Wall Hanging for Control Room Temperature (White) : Amazon.co.uk: DIY & Tools Temperature Controller, 2 Wire Room Thermostat Heating Thermostat Digital Thermostat with Large Screen LCD Display Wall Hanging for Control Room Temperature (White) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/61unDW2N8zL._AC_UF894,1000_QL80_.jpg)