Although the Rinnai 204000045 wall thermostat installation kit instructions show a 3-wire connection schematic, I am confused as wires to connect. First, what terminals in the Nest are used? Then, what wires from the WiFi module go where?
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None of the Nest thermostats will work via Wi-FI to that device.
Just follow the instruction provided in the installation manual that comes with the kit
Connect one of the black wires to the W1 terminal on the Nest
Connect the other black wire and one side of the 24VAC adapter to the C terminal on the Nest
And, connect the other side of the 24VAC adapter to the Rh terminal of the Nest