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Viessmann ViCare

The Viessmann ViCare integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] lets you control Viessmann devices via the Viessmann ViCare (REST) API. Most recent network-connected Viessmann heating devices (e.g., gas boilers) should be supported.

Prerequisites

You will need to sign in on the Viessmann developer portal with your existing ViCare app user credentials.

Create a new API client by selecting Add in the Clients section on the developer dashboard with the following settings:

Name: HomeAssistant
Google reCAPTCHA: disabled
Redirect URIs: vicare://oauth-callback/everest

Copy the Client ID in the Clients section on the developer dashboard for the setup in Home Assistant.

Important

You have to set up the integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] from your device (phone) where you have the ViCare app installed. Otherwise, your device does not know how to handle the vicare:// redirect URL, and you will receive an Invalid credentials notification and the setup procedure will fail.

Note

It may take up to an hour for your new client to become active and usable. Otherwise, you will not receive any devices in Home Assistant.

API limits

The Viessmann API is rate-limited. In the “Basic” (free) tier of their API plans, if you exceed one of the limits below, you will be blocked for 24 hours:

120 calls for a time window of 10 minutes
1450 calls for a time window of 24 hours

For the paid API plans this limit increases to 3000 calls in 24 hours. The integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] polls the API every 60 seconds and will work within these limits. However, any additional requests to the API, for example, by setting the temperature via the integration and interacting with the ViCare app, count into those limits.

Important

For any Viessmann API plan except the most expensive “Advanced” tier, Viessmann imposes certain limits on which APIs are accessible for end-user consumption. Unfortunately, this also affects APIs useful for smart home integrations, like controlling thermostats (TRVs) and climate sensors, which are only available in the “Advanced” plan API tier. In case you set up the integration with a lower-tier plan, TRVs and other smart home entities will not become accessible in your Home Assistant installation.

Please consider providing feedback to Viessmann as described in their FAQ “Where can I give feedback on the API?” in case you consider this as a limitation for your use-case.

Note

If you have multiple Viessmann devices in Home Assistant, the limit is shared between them, meaning the poll interval is increased, and the values are less frequently updated!

Configuration

To add the Viessmann ViCare integration to your Home Assistant instance, use this My button:

Viessmann ViCare can be auto-discovered by Home Assistant. If an instance was found, it will be shown as Discovered. You can then set it up right away.

Manual configuration steps

If it wasn’t discovered automatically, don’t worry! You can set up a manual integration entry:

Browse to your Home Assistant instance.
Go to Settings > Devices & Services.
In the bottom right corner, select the Add Integration button.
From the list, select Viessmann ViCare.
Follow the instructions on screen to complete the setup.

Entities

ViCare represents devices as a set of data points and the ViCare integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] maps those to entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more] of different platformsPlatforms are building blocks provided by some integrations to be used by other integrations. [Learn more] in Home Assistant. A single device may be represented by one or more platforms.

Climate

Represents the heating controls of your device.

Note

Viessmann devices with room temperature sensing will show the current room temperature via current_temperature. All other devices will show the current supply temperature of the heating circuit.

Fan

Ventilation units are displayed as fans and enable the change of speed and use of presets.

Water heater

Represents the domestic hot water controls of your device.

Note

It is not possible to turn on/off water heating via the water heater integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] since this would conflict with the operation modes of the heating integration. Therefore, the operation mode of that integration is just available as an attribute and cannot be modified.

Sensor

Additional data for a device is available as separate sensors. The sensors are automatically discovered based on the available API data points.

Button

Button entities are available for triggering like a one-time charge of the water heater.

Number

Number entities are available to adjust values like the predefined temperature for different heating programs or the heating curve shift and slope.

Actions

The following actions of the climate integration are provided by the ViCare integration: set_temperature, set_hvac_mode, set_preset_mode

The following actions of the water_heater integration are provided by the ViCare integration: set_temperature

Action vicare.set_vicare_mode

Set the mode for the climate device as defined by Viessmann (see set_hvac_mode for a mapping to Home Assistant Climate modes. This allows more-fine grained control of the heating modes.

Data attribute	Optional	Description
`entity_id`	yes	String or list of strings that point at `entity_id`’s of climate devices to control. To target all entities, use the `all` keyword instead of entity_id.
`vicare_mode`	no	New value of ViCare mode. For supported values, see the `vicare_modes` attribute of the climate entityAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more].

Action climate.set_temperature

Sets the target temperature to the given temperature.

Data attribute	Optional	Description
`entity_id`	yes	String or list of strings that point at `entity_id`’s of climate devices to control. To target all entities, use `all` keyword instead of entity_id.
`temperature`	no	Desired target temperature.

Note that set_temperature will always affect the current normal temperature or, if a preset is set, the temperature of the preset (i.e., Viessman program like eco or comfort).

Action climate.set_hvac_mode

Set HVAC mode for the climate device. The following modes are supported:

The ViCare integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] has the following mapping of HVAC modes to Viessmann operation modes:

HVAC mode	Viessmann mode	Description
`off`	`ForcedReduced`	Permanently set heating to reduced temperature. Note: This will also deactivate domestic hot water.
`heat`	`ForcedNormal`	Permanently set heating to normal temperature.
`auto`	`DHWandHeating`	Switches between reduced and normal temperature as by the heating schedule programmed in your device.

Data attribute	Optional	Description
`entity_id`	yes	String or list of strings that point at `entity_id`’s of climate devices to control. To target all entities, use `all` keyword instead of entity_id.
`hvac_mode`	no	New value of HVAC mode.

Action climate.set_preset_mode

Sets the preset mode. Supported preset modes are eco and comfort. These are identical to the respective Viessmann programs and are only active temporarily for 8 hours. Eco mode reduces the target temperature by 3°C, whereas Comfort mode sets the target temperature to a configurable value. Please consult your heating device manual for more information.

Data attribute	Optional	Description
`entity_id`	yes	String or list of strings that point at `entity_id`’s of climate devices to control. To target all entities, use `all` keyword instead of entity_id.
`preset_mode`	no	New value of preset mode.

Action water_heater.set_temperature

Sets the target temperature of domestic hot water to the given temperature.

Data attribute	Optional	Description
`entity_id`	yes	String or list of strings that point at `entity_id`’s of climate devices to control.
`temperature`	no	New target temperature for water heater.

Troubleshooting

UTF-8 characters in passwords

The underlying PyViCare Python library cannot handle UTF-8 characters in passwords, so do not use for example ü, ø, etc. in passwords.

GATEWAY_OFFLINE

The ViCare API tends to lose contact with the gateway from time to time. This will be logged in Home Assistant with:

Invalid data from Vicare server: {
  'viErrorId': '...',
  'statusCode': 400,
  'errorType': 'DEVICE_COMMUNICATION_ERROR',
  'message': '',
  'extendedPayload': {
    'httpStatusCode': 'NotFound',
    'code': '404',
    'reason': 'GATEWAY_OFFLINE'
  }
}

Usually, this resolves itself after a while, but if this state persists, try to power cycle your gateway.

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