does nest need a c wire

Only if you want it to work for more than a year. The instructions and folks here will tell you the c wire isn't required, but I have found that that is not really true. Sure, it will work for 6 to 12 months, but then the battery will die. You can then try charging it with a USB cable but the first time you do that you will get a couple days more use from it. After that, it won't last long enough to work. And, if you try to replace the battery there's a good chance that won't work, either and, if you are lucky enough to still be under warranty, it voids your warranty. My 2nd nest has just failed and rather than buy a 3rd, or pay an electrician to add a c wire, I am going to replace it with a much less expensive honeywell.

does this work with 220v

NO, a not. Google Nest is not designed for 220v electrical-baseboard heating systems, and attempting to connect it to such a system will destroy the unit. However, if your baseboard system is boiler/steam-heated, it WILL work with those, since those are still a low-voltage system that simply opens & closes a valve to regulate temperature. On a side note, it is utterly dreadful just how poor the quality other answers here are. Do people honestly not know what 220v is in relation to heating? Folks, simply enough, if you don't know the answer, then DON'T respond.

How does it detect when you're home? If we're gone and kids are home with a babysitter, will it know someone's home? Or is it based on cell location?

If you add Nest Protect smoke/CO detectors, the system will also use their motion detectors to sense if you're home. This can be useful if the thermostat is located somewhere that doesn't get much foot traffic or if you spend long hours in another room.

Can the Nest replace my current Nexia thermostat ?

You will have to get a wiring diagram to see if nest is compatible.

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Description

🌡️ Stay ahead of the curve with smart, stylish comfort!

BATTERY POWERED FREEDOM - No wiring hassles—runs on included CR2 battery for easy wall mounting.
VOICE ACTIVATED COMFORT - Compatible with Google Assistant for hands-free temperature adjustments.
SMART WI FI CONNECTIVITY - Control your home's climate from anywhere with reliable Wi-Fi integration.
EFFORTLESS PROGRAMMABILITY - Set custom temperature schedules that adapt to your lifestyle and save energy.
SLEEK MATTE FINISH COMPACT DESIGN - Modern round shape with a 2.1-inch backlit display fits any stylish home.

The Google Nest 3rd Gen Universal Programmable WiFi Thermostat (T3017US) offers precise temperature control through Wi-Fi and Google Assistant compatibility. Featuring a sleek matte finish, a 2.1-inch backlit LCD display, and flexible programmable settings, it runs on a single CR2 battery for easy installation. Designed for modern homes, it combines energy efficiency with smart convenience.

Specifications

Brand	Google
Controller Type	Google Assistant, WiFi
Special Feature	Programmable
Colour	as shown in the image
Temperature Control Type	programmable
Connectivity Technology	Wi-Fi
Power Source	Battery Powered
Item Weight	1 Pounds
Voltage	24 Volts
Shape	Round
Display Type	lcd or led
Finish Type	Matte
Screen Size	2.1 Inches
Control Type	Button Control
Control Method	App
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	Classic
Backlight	Yes
Number of Batteries	1 CR2 batteries required. (included)
UPC	642892801039 813917020203
Global Trade Identification Number	00813917020203, 08907758011116
Item model number	T3017US
ASIN	B01MXC366M

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