![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) :
![Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 Wires), White - Amazon.com Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 Wires), White - Amazon.com](https://m.media-amazon.com/images/I/713fr+sviVL.jpg)
Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 Wires), White - Amazon.com
![Venstar ACC0410 Add-A-Wire Accessory for 24 VAC Thermostats (4 to 5 Wires), White: Amazon.com: Tools & Home Improvement Venstar ACC0410 Add-A-Wire Accessory for 24 VAC Thermostats (4 to 5 Wires), White: Amazon.com: Tools & Home Improvement](https://m.media-amazon.com/images/I/81NniHWiJnL.jpg)
Venstar ACC0410 Add-A-Wire Accessory for 24 VAC Thermostats (4 to 5 Wires), White: Amazon.com: Tools & Home Improvement
![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)