Installing a Google Nest Thermostat - In-Depth (UK) | OpenTherm & On/Off Control

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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Buy on Amazon US (Affiliate):
- 3rd Generation Nest Thermostat: https://amzn.to/3TNS2dl
- Preciva Ferrule Kit: https://amzn.to/3THLBbL

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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