![Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) : Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) :](https://preview.redd.it/rx53me8zs8z71.jpg?width=640&crop=smart&auto=webp&s=ac89cd0dbc4fb66351ef8e71110a553c069509a4)
Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) :
![Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection) FSCM00 - The Home Depot Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection) FSCM00 - The Home Depot](https://images.thdstatic.com/productImages/bff2c7f8-d99a-4032-966a-4655aa12b5ad/svn/fast-stat-thermostat-sensors-fscm00-4f_600.jpg)
Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection) FSCM00 - The Home Depot
![Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection) FSCM00 - The Home Depot Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection) FSCM00 - The Home Depot](https://images.thdstatic.com/productImages/f1cef802-6ed6-4706-a71c-cf29e3bdf4aa/svn/fast-stat-thermostat-sensors-fscm00-64_1000.jpg)
Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection) FSCM00 - The Home Depot
![Venstar ACC0410 Add-A-Wire Kit: Household Thermostat Accessories: Amazon.com: Tools & Home Improvement Venstar ACC0410 Add-A-Wire Kit: Household Thermostat Accessories: Amazon.com: Tools & Home Improvement](https://m.media-amazon.com/images/I/41ee9nEplHL._AC_UF1000,1000_QL80_.jpg)