Controlling an ancient millivolt heater with a Nest

Looks simple right? It is :(
3rd Generation Nest Thermostat
I kept coming back and checking, but the answer never changed
I’ll use BOLD to reference this wiring diagram below
I keep a paint pen in my toolbox for marking, and it comes in handy all the time

Step one

Step two

If you squint your eyes you can make out the “HOT” and “NEU”

Step three

Close-up of the wires running to my old heater. My new control wires are just run in parallel to the old ones.

Step four

It works!

Step five

Step six

I shall be telling this with a sigh

Somewhere ages and ages hence:

Two roads diverged in a wood, and I —

I, well, I took the clearly marked trail that had lights, hand rails, and a 4.5 star rating with over 1,000 reviews on Yelp,

And I think of the Honeywell engineers who paved that trail for me with deference.

:)

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