Combi Boiler with Two Heating Zones, 230V Switching

Wiring for a combination boiler with two central heating zones, each zone controlled by its own thermostat.
This is for 230V switched boilers only - NOT appropriate for boilers with 24V or other non-mains inputs. Part 2 covers those: https://youtu.be/nOQ8ZEhSLDI
Can be used with almost any thermostats, including Hive, Nest and other smart devices. Also applies to wireless, wired, mains powered and battery thermostats.

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Видео Combi Boiler with Two Heating Zones, 230V Switching канала John Ward