Add Nobø Ecohub integration (#17915)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

CODEOWNERS

@@ -405,6 +405,7 @@ source/_integrations/nina.markdown @DeerMaximum
 source/_integrations/nissan_leaf.markdown @filcole
 source/_integrations/nmbs.markdown @thibmaek
 source/_integrations/noaa_tides.markdown @jdelaney72
+source/_integrations/nobo_hub.markdown @echoromeo @oyvindwe
 source/_integrations/notify.markdown @home-assistant/core
 source/_integrations/notify_events.markdown @matrozov @papajojo
 source/_integrations/notion.markdown @bachya

source/_integrations/nobo_hub.markdown

@@ -0,0 +1,51 @@
+---
+title: Nobø Ecohub
+description: Instructions on how to integrate Nobø Ecohub into Home Assistant.
+ha_category: Climate
+ha_release: 2021.10
+ha_iot_class: Local Push
+ha_config_flow: true
+ha_codeowners:
+- '@echoromeo'
+- '@oyvindwe'
+ha_domain: nobo_hub
+ha_platforms:
+- climate
+---
+
+Integrates [Nobø Ecohub](https://www.glendimplex.no/produkter/varmestyring/11123610/noboe-hub/c-77/p-330)
+into Home Assistant. This integration is not officially supported or endorsed by Glen Dimplex Nordic AS,
+and the authors/maintainers are not official partners of Glen Dimplex Nordic AS.
+
+To configure the integration, you need the 3 last digits of the serial number of your hub. These are located
+on the back of the hub. If the hub is on a different local network than Home Assistant, you also need the
+IP address of the hub.
+
+{% include integrations/config_flow.md %}
+
+## Operation modes
+
+As for now you can see and change operation and preset for zones and set eco/comfort temperatures if you have
+a supported thermostat.
+
+The possible operation modes are as follows:
+
+- "Auto" - In this mode, the zone is in the normal setting and preset shows which state the zone is in right now
+  (according to calendar setup).
+- "Heat" - In this mode the zone in the override setting and in the state selected by preset ("Away", "Eco"
+  or "Comfort").
+
+This can be utilized the following ways:
+
+- Changing preset to "Away", "Eco", or "Comfort" will automatically change operation to "Heat".
+- Changing preset to none will automatically change operation to "Auto" and update preset.
+- Changing operation to "Auto" will automatically update preset.
+- Changing operation to "Heat" will set preset to "Comfort".
+
+### No preset "Off"
+
+Nobø heaters does not support preset "Off". This is not a limitation in the integration, but a safety mechanism in the
+Nobø  system (maybe they don't want you to accidentally turn off all your heaters and get frozen pipes). "Away"
+temperature is fixed to 7°C and cannot be altered. On/off receivers will be off when the zone is in "Away" status.
+
+For more information, see the [Nobø Ecohub manual](https://help.nobo.no/en/user-manual/before-you-start/what-is-a-weekly-program/).