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Nest and other such thermostats, 2 wire system

450 Views 6 Replies 5 Participants Last post by  More Power!
I have a traditional cold start boiler with a 2 wire system. I do have one internet thermostat, but it's a beast, ethernet cable, big module on the boiler, etc. and a hideous outdated app and website, so I'd like to go wi-fi and put "nest like" tstats throughout (I have 3 zones). I've heard that Nest tstats can "rob" power from the boiler (electricity) for charging its battery, and that this "robbing" can interfere with the firing of the boiler from time to time. I believe my electrician says we can fix this by running a separate "c" or "power" wire, which adds a little to the labor but not too onerous.

Does anyone know of some other alternative "simpler" solutions with other WiFi thermostats?

Thank you!
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They just covered this problem in a recent Ask This Old House episode: S18 E13: Loose Railing, Smart Thermostat. (It's in the latter part of that episode.)

This is what he used: Invita™ WiFi Thermostat 564

Looked like a pretty neat solution.
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