In this video I upgrade to a 3rd Generation Google Nest Thermostat to control my Viessmann Vitodens 050-W combi boiler. This will be a super in-depth video where I cover On/Off control, OpenTherm control, hardwiring the thermostat back to the Heat Link and share a couple of tips and tricks around mounting a Nest onto a standard back box and how to stop the Nest preheating a combi boiler.
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Chapters: 00:00 - Introduction 05:02 - Hardware Unboxing 13:07 - Heat Link Wiring Explanation 20:58 - Tour of Existing Installation 31:44 - Installing the Heat Link for On/Off Control 45:28 - Setting up the Nest Stand 48:11 - Initial Setup 51:06 - OpenTherm vs On/Off Control 56:55 - Wiring up the Heat Link for OpenTherm 01:02:49 - Configuring the Viessmann Vitodens 050-W to use OpenTherm 01:08:27 - Configuring the Nest Thermostat to use OpenTherm 01:12:46 - Demonstrating OpenTherm Modulation 01:15:13 - Hardwiring the Thermostat 01:24:52 - Trick to mount the Thermostat on a UK back box 01:33:12 - Hack to disable hot water preheat 01:38:27 - Conclusion
