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This is fairly simple According to the ladder diagram for your system, the thermostat simply connects transformer R to the call-for-heat signal on your control board, so this is straightforward. You …

The red wire then lands on Rh, with the white on W, as you'd expect; this means that your boiler won't confuse your thermostat if it ever malfunctions and cuts out on low water, overtemperature, or such …

Wiring-wise: you have the correct idea Your proposed wiring scheme (R to R/Rc, G to W1, and C to C) is correct for the boiler you're working with; this can be deduced from the wiring diagram supplied on … require turning off automatic home/away detection to prevent it from causing daily recovery swings, as well as configuring the thermostat as described above to avoid uncomfortable "short cycling" of the boiler …

I'd strongly recommend getting a steam-boiler veteran out there to rearrange the controls on your boiler so that you can provide constant 24VAC to your thermostat. … This way, the Nest gets a constant 24VAC supply, yet breaks the thermostat circuit on the boiler in the place the boiler expects it to, to avoid interactions with the low-water cutoff and that aquastat …

As it turns out, C is staring you in the face As it turns out, the transformer is sitting right in the middle of your photos, and by matching the wiring diagrams from your boiler's installation manual …

Connect C to the wire-nutted bundle of yellow wires According to the manual for your unit, the C-wire coming off your transformer is a yellow wire (we know this because the manual has it connected to …

Since tenants are involved, you'll need to do this right If you were owner-occupying a zoned single-family dwelling, then taking shortcuts in the interest of expediency would be an acceptable way to …

You'll need a relay here Your boiler, in addition to using nonstandard wire nomenclature, does not provide 24VAC power directly to the thermostat. … One relay contact terminal (the COM terminal) jumpered to the Y terminal on your boiler The other relay contact terminal (the NO terminal) jumpered to the G terminal on your boiler And the red wire from …

Tap the white wire in the control harness If you look closely at the wiring diagram for your boiler -- there is a 9 pin connector with a harness connected to it that connects to the thermostat wiring … Install your Ecobee, turn the boiler back on, and enjoy! …

The relay contacts then simply go in parallel -- this means that a call for heat from either thermostat will fire the boiler. …

Running them at the same time won't cause breakage As Ed Beal indicates in his comments, running both systems simultaneously with the mini-split set for heating won't cause trouble -- in fact, your m …

Add a ground screw and land the ground wires there I'd use a self-tapping ground screw (Garvin GSST or equivalent -- these are different from regular sheet-metal screws in that they use a fine-pitch …

You have a short in your wiring Somewhere in the wiring for your HVAC system, Rc has shorted to Y. Find the short and fix it (using electrical tape to insulate the shorted wires will work for now gi …

Try switching the wire connecting the Nest's W output to the Nest's G output and seeing if turning the fan on causes the boiler to fire up. …

Putting the switching in the C wire, as the installers of your setup did, works, but has the undesirable side effect that grounding out the wiring from the zone valve to the thermostat or boiler control …