No C terminal at boiler

[seascoundrel]

I'm installing a nest thermostat and I have a 2 wire heating system  with no c wire at boiler. I have 24v on the red wire. Can I add a jumper wire from R to C at the thermostat to supply voltage or do I have to get a 24v transformer?

[zoeuvre]

Hi seascoundrel, 

Thanks for posting here in the Community forum and for showing interest in our Nest Thermostats. 

Jumper wire is not needed for Nest Thermostat. if your system is just two-wire heating system only, I recommend you contact a professional installer to wire a C wire from your heating system to the thermostat base or have a Nest Power Connector installed on your control board where the other end of the thermostat wires are connected. 

Let us know if you have any other questions.

Best,

Zoe