Can Nest's new thermostat save you £350 a year?Which? looks at the figures to reveal the truth

17 November 2015


Could you really save £350 a year with the new 3rd Generation Nest Learning thermostat?

Nest has launched the third generation of its Nest Learning thermostat, which it says could save you as much as £350 a year on your energy bills. But is that really true?

As always, at Which? we delve into grand claims rather than taking them at face value. And Nest's claimed saving of £350 is based on the assumption that your home is set at a constant temperature of 20°C throughout the week. 

Do you know anyone that has their heating on all week for 24 hours a day? Unless you do, adding the Nest thermostat is very unlikely to save you £350 on your bills. But that doesn't mean you won't save anything with a smart thermostat. 

If you're thinking about getting a smart thermostat, take a look at our smart thermostat reviews, where we have 11 tested thermostats in the Which? lab, including the second-generation Nest Learning thermostat and the Hive Active Heating. 

Nest thermostat - is it worth it?

There are a number of factors that will affect how much you could save with a smart thermostat. In our guide, Are smart thermostats worth it?, we've outlined the types of households that could benefit, and those that are better spending their money elsewhere. Here are the key factors to think about:

  • Is your lifestyle busy and are you away from home a lot, especially at the last minute? 
  • Do you have a smartphone and will you make full use of the away-from-home features that allow you to adjust your heating when you're out?
  • Is your home energy efficient? If it's not, it might be better to spend money on insulating your home first. 
  • Will you be moving in the next year or so or will you be staying for the foreseeable future?

You can also visit our guide to buying the best smart thermostat to help you decide what's right for you.

Smart thermostat features

As well as being able to be controlled from your phone or computer, smart thermostats have a number of other potentially useful features, including:

  • the ability to learn your routine and adjust the heating accordingly; 
  • motion sensors and GPS tracking, so it knows when you've left the house and how near you are to home;
  • the ability to alter the temperature based on the weather outside.

The new third-generation Nest Learning thermostat can now control your hot water tank, as well as central heating. It also has OpenTherm technology, which according to Nest means it can work with compatible boilers to decide on the amount of gas to burn to reach the right temperature, potentially saving you energy. 

See our review of the second-generation Nest Learning thermostat to find out whether it's worth the money.

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