User interface: 3 LEDs – status, manual heating, manual hot water, Nest button used for manual heating mode or to reset.

Heating System Connectivity: On/Off (heating and hot water), Works with OpenTherm (heating and hot water) Class IV when Installed in an On/Off Heating System & Class VI when Installed in an OpenTherm Heating System

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Multitude of sensors available; Temperature, Humidity, Near/Far-field activity and Ambient Light sensors.

Not only can the Nest Thermostat help save your money, it can keep your home safe from deadly carbon monoxide leaks with the Nest Protect (sold separately). If the Protect detects the gas, it can tell the Thermostat to turn off the boiler – a leading cause of CO leaks. Control it from anywhere using your phone, tablet or computer. The Nest Learning Thermostat should be installed by a professional. Includes Nest Heat Link which works with your boiler to control the temperature of your home. The Heat Link connects to your boiler wirelessly or with existing thermostat wires. Then it communicates with the Nest Thermostat to turn on and off, or modulate the heat. This cunning bit of kit automatically adjusts energy use to your routine. As you turn the temperature up and down, it gradually learns your schedule and creates one for you. Furthermore, the Auto-Away function tinkers with the temperature after you’ve left the house. It even automatically turns off the hot water if you’re away for a few days. Smart heating controls can make it easier to manage heating and hot water to suit your home. This can help reduce your home's energy consumption.

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Relays: 2 relays supporting 3 (1) A load @ 230 V AC, on both satisfied and call-for heat connectors, Input power 100-240 V AC, 50/60 Hz, Output power provides 12 V DC to thermostat The Nest Thermostat learns from you and gets to know the temperature you like when you’re at home. It turns itself down when you’re away. It even learns how your home warms up or how draughty it is, so it only uses the energy it needs. That’s how the Nest Thermostat saves energy. Nest’s sleeker and thinner Learning Thermostat will slash your energy bill and boost your Smart Home credentials. Since 2011, Nest has helped save over 4 billion kWh of energy in homes around the world, and this supremely sophisticated Thermostat can work wonders for you too. This device gets to know you, and adjusts energy usage accordingly, so you only use what you need and get a stylish home accessory to boot. All the features, such as the new Farsight display, will stun you with their bill-busting, hyper-intuitive results. The third generation of the Nest Thermostat uses OpenTherm Technology to modulate your compatible, high-efficiency condensing boiler. This advanced tech can drive down your energy bill even more.