theres no C terminal on my boiler

luckyguy

in the thermostat i have black hooked up to W and red hooked up to the R and white wire is unused

in the tekmar the red wire from the thermostat goes to the 24v transformer on the R. the black wire from the thermostat goes to the boiler demand terminal 1 on the tekmar. the white wire from the stat is snipped off in the tekmar box..mighty short too i may add

the white wire coming from the 24V transformer goes to both terminal 2 and 4 on the tekmar

the green wire that runs next to the other transformer wires is not hooked up at either end.

the red wire from the transformer is also twisted with a wire that goes to my indirect HW heater

so now is it possible to determine what my C wire really is?