How To Differentiate Between Three Generations Of Nest Thermostats?

The Nest is a connected thermostat with an Android app that lets you remotely control the temperature. There are three generations of the Nest Learning Thermostat—the first generation, the second generation, and third generation. In terms of looks they are quite similar. They also use similar software but have some basic differences. Let’s take a look at three generations of thermostat and know how to tell one from the other-


The color of metal ring of a third generation Nest Learning thermostat is of colors such as copper, white, or black, but not stainless steel. If you have a unit of stainless steel-colored metal ring, then it is a first or second generation thermostat. .

Now how to demarcate between a first generation and second generation unit through their display? They have the same diameter of 2.75 inch. However, the second generation thermostats have slimmer profile whereas the first generations have a thicker one. The second generation has a seamless ring. The first generation has a visible seam between ring and display

Nest apps

The generation of the Nest thermostat can be traced from their mobile app. On the screen of the smart phone, tap your thermostat. Now hit the settings icon in the top right corner of the screen. Next go to Technical info. You will see the model no. displayed there, such as -1.xx or 2.xx or 3.xx. The first digit in the model no, stands for the generation of the Nest thermostat.


There is a difference between second and third generation thermostats can be seen in terms of compatibility too. The 2nd-generation Nest Learning Thermostat is compatible with:

• Combi boilers
• Hydronic underfloor systems
• Air-source and ground-source heat pumps
• Biomass boilers
• System and heat-only boilers
• High-voltage (switched live) systems, low current (≤3 A)
• Volt-free (dry contacts) systems, low current (≤3 A)
• Zoned systems
• District and collective heating systems with accessible individual electric valve

The 3rd-generation Nest Learning Thermostat is compatible with all above mentioned systems. Additionally it is also compatible with

• Domestic hot water tank
• OpenTherm-enabled heating systems




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