Add sensor platform to eheimdigital (#37539)

* Add fan platform to eheimdigital

* fix ha_platforms

* Change fan to sensor

source/_integrations/eheimdigital.markdown

@@ -4,6 +4,7 @@ description: Instructions on how to set up EHEIM Digital with Home Assistant.
 ha_category:
   - Climate
   - Light
+  - Sensor
 ha_release: 2025.1
 ha_iot_class: Local Polling
 ha_config_flow: true
@@ -14,6 +15,7 @@ ha_integration_type: hub
 ha_platforms:
   - climate
   - light
+  - sensor
 ha_quality_scale: bronze
 ha_zeroconf: true
 ---
@@ -47,6 +49,14 @@ Currently, the following devices and entities are supported:
 - **Target temperature**: Controlling the target temperature of the heater (which corresponds to the day temperature in Bio and Smart mode)
 - **Presets / Operation mode**: Switching between Manual, Bio and Smart mode
 
+### [EHEIM classicVARIO+e](https://eheim.com/en_GB/aquatics/technology/external-filters/classicvario-e-250/classicvario-e-250)
+
+#### Sensor
+
+- **Current pump speed**: Displays the current pump speed
+- **Remaining hours until service**: Displays the remaining time until the filter needs to be serviced
+- **Error code**: Displays the current error code of the device (No error, Rotor stuck, air in filter)
+
 Support for additional EHEIM Digital devices and entities will be added in future updates.
 
 ## Remove integration