I would like to put a smart thermostat for my heating system in my house, but the one I’d like requires a C wire. I have hot water heat having a Weil McLain boiler with two zones. The two thermostats in the house right now only run off of two wires each. They run down to a control panel located above the boiler. I will attach pictures of them. There appears to be no place in the panel where I can pick up a C wire in I’m wondering if I can just pick up power from a low-voltage transformer. If I can, can I run it off the same transformer that feeds my doorbells or should I put a new transformer in. And how would I wire the transformer, just a C wire to one of the transformer’s screws or how would I do this? Appreciate anyone’s help on this.