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Nest is finally selling its Thermostat in the UK. Centre is the main unit, on its left is the new 'Heat Link' and an iPhone running the Nest app.

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For £29 ($50), you can buy a stand that lets you plug the Thermostat in anywhere, removing the need to wire it in to a wall.

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The Heat Link box needs to be wired into a boiler, replacing the existing programmer.

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The Thermostat sends commands to the Heat Link box wirelessly, telling the boiler when to turn off and on.

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You can use an iPhone or Android app to change the temperature of your house.

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The app gives you information about your energy usage, showing the temperature at various times and when the auto-away feature activated.

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The sensors in the Thermostat measure temperature and humidity, amongst other things.

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The Thermostat works with the Nest Protect. The app reassures you that there's no fire or deadly carbon monoxide.

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Turn the temperature down and you will see a green leaf on the screen that lets you know you're saving energy.

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Help messages appear on the screen to help you use the Thermostat.

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The Thermostat knows how long it takes your heating system to warm your house and adjusts the turn-on and shut-off times accordingly.

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You can make sure that the auto-away feature that turns your boiler off when everyone leaves the house is enabled here.

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Turn the dial and push the screen inwards to select the menus options at the edge of the screen.

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You can manually set the boiler schedule if you wish.

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When you increase the target temperature, the Thermostat tells you how long it will take your heating system to reach it.

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You can change the readout to show Fahrenheit or Celsius.

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The UK Nest Thermostat is on sale today for £249 ($420) including installation.

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