diff --git a/homeassistant/components/overkiz/__init__.py b/homeassistant/components/overkiz/__init__.py
index bb97f2aae81d39..282d3e8d29598d 100644
--- a/homeassistant/components/overkiz/__init__.py
+++ b/homeassistant/components/overkiz/__init__.py
@@ -41,7 +41,7 @@ class HomeAssistantOverkizData:
     """Overkiz data stored in the Home Assistant data object."""
 
     coordinator: OverkizDataUpdateCoordinator
-    platforms: dict[Platform, Device | Scenario]
+    platforms: defaultdict[Platform, list[Device | Scenario]]
 
 
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
@@ -74,9 +74,6 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         raise ConfigEntryNotReady("Failed to connect") from exception
     except MaintenanceException as exception:
         raise ConfigEntryNotReady("Server is down for maintenance") from exception
-    except Exception as exception:  # pylint: disable=broad-except
-        _LOGGER.exception(exception)
-        return False
 
     coordinator = OverkizDataUpdateCoordinator(
         hass,
@@ -98,7 +95,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         )
         coordinator.update_interval = UPDATE_INTERVAL_ALL_ASSUMED_STATE
 
-    platforms: dict[Platform, Device | Scenario] = defaultdict(list)
+    platforms: defaultdict[Platform, list[Device | Scenario]] = defaultdict(list)
 
     hass.data.setdefault(DOMAIN, {})[entry.entry_id] = HomeAssistantOverkizData(
         coordinator=coordinator,
@@ -121,7 +118,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
 
     hass.config_entries.async_setup_platforms(entry, PLATFORMS)
 
-    device_registry = await dr.async_get_registry(hass)
+    device_registry = dr.async_get(hass)
 
     for gateway in setup.gateways:
         _LOGGER.debug("Added gateway (%s)", gateway)
diff --git a/homeassistant/components/overkiz/button.py b/homeassistant/components/overkiz/button.py
index 7a2c0b0448ced9..7fbed39356c3ac 100644
--- a/homeassistant/components/overkiz/button.py
+++ b/homeassistant/components/overkiz/button.py
@@ -46,7 +46,7 @@ async def async_setup_entry(
     hass: HomeAssistant,
     entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
-):
+) -> None:
     """Set up the Overkiz button from a config entry."""
     data: HomeAssistantOverkizData = hass.data[DOMAIN][entry.entry_id]
     entities: list[ButtonEntity] = []
diff --git a/homeassistant/components/overkiz/config_flow.py b/homeassistant/components/overkiz/config_flow.py
index c4748b8275110d..a8a99e4bd1ba46 100644
--- a/homeassistant/components/overkiz/config_flow.py
+++ b/homeassistant/components/overkiz/config_flow.py
@@ -19,6 +19,7 @@
 from homeassistant.components import dhcp
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 from homeassistant.data_entry_flow import FlowResult
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
 
 from .const import CONF_HUB, DEFAULT_HUB, DOMAIN
 
@@ -35,9 +36,13 @@ async def async_validate_input(self, user_input: dict[str, Any]) -> None:
         username = user_input[CONF_USERNAME]
         password = user_input[CONF_PASSWORD]
         server = SUPPORTED_SERVERS[user_input[CONF_HUB]]
+        session = async_get_clientsession(self.hass)
 
         async with OverkizClient(
-            username=username, password=password, server=server
+            username=username,
+            password=password,
+            server=server,
+            session=session,
         ) as client:
             await client.login()
 
diff --git a/homeassistant/components/overkiz/coordinator.py b/homeassistant/components/overkiz/coordinator.py
index b258742fc6c350..ce0344c49dde3c 100644
--- a/homeassistant/components/overkiz/coordinator.py
+++ b/homeassistant/components/overkiz/coordinator.py
@@ -19,7 +19,7 @@
 from pyoverkiz.models import DataType, Device, Place, State
 
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers import device_registry
+from homeassistant.helpers import device_registry as dr
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
 
 from .const import DOMAIN, UPDATE_INTERVAL
@@ -97,9 +97,6 @@ async def _async_update_data(self) -> dict[str, Device]:
                 raise UpdateFailed("Too many requests, try again later.") from exception
 
             return self.devices
-        except Exception as exception:
-            _LOGGER.debug(exception)
-            raise UpdateFailed(exception) from exception
 
         for event in events:
             _LOGGER.debug(event)
@@ -123,7 +120,7 @@ async def _async_update_data(self) -> dict[str, Device]:
 
             elif event.name == EventName.DEVICE_REMOVED:
                 base_device_url, *_ = event.device_url.split("#")
-                registry = await device_registry.async_get_registry(self.hass)
+                registry = dr.async_get(self.hass)
 
                 if registered_device := registry.async_get_device(
                     {(DOMAIN, base_device_url)}
@@ -176,7 +173,7 @@ def _get_state(
         cast_to_python = DATA_TYPE_TO_PYTHON[data_type]
         return cast_to_python(state.value)
 
-    def places_to_area(self, place):
+    def places_to_area(self, place: Place) -> dict[str, str]:
         """Convert places with sub_places to a flat dictionary."""
         areas = {}
         if isinstance(place, Place):
diff --git a/homeassistant/components/overkiz/entity.py b/homeassistant/components/overkiz/entity.py
index 13f9fc781a7e29..99f553d3474cea 100644
--- a/homeassistant/components/overkiz/entity.py
+++ b/homeassistant/components/overkiz/entity.py
@@ -74,7 +74,7 @@ def generate_device_info(self) -> DeviceInfo:
             ),
             hw_version=self.device.controllable_name,
             suggested_area=self.coordinator.areas[self.device.place_oid],
-            via_device=self.executor.get_gateway_id(),
+            via_device=(DOMAIN, self.executor.get_gateway_id()),
             configuration_url=self.coordinator.client.server.configuration_url,
         )
 
diff --git a/homeassistant/components/overkiz/executor.py b/homeassistant/components/overkiz/executor.py
index 52e21255728041..55bda409e2d05f 100644
--- a/homeassistant/components/overkiz/executor.py
+++ b/homeassistant/components/overkiz/executor.py
@@ -37,7 +37,7 @@ def has_command(self, *commands: str) -> bool:
         """Return True if a command exists in a list of commands."""
         return self.select_command(*commands) is not None
 
-    def select_state(self, *states) -> str | None:
+    def select_state(self, *states: str) -> str | None:
         """Select first existing active state in a list of states."""
         for state in states:
             if current_state := self.device.states[state]:
@@ -49,7 +49,7 @@ def has_state(self, *states: str) -> bool:
         """Return True if a state exists in self."""
         return self.select_state(*states) is not None
 
-    def select_attribute(self, *attributes) -> str | None:
+    def select_attribute(self, *attributes: str) -> str | None:
         """Select first existing active state in a list of states."""
         for attribute in attributes:
             if current_attribute := self.device.attributes[attribute]:
@@ -57,7 +57,7 @@ def select_attribute(self, *attributes) -> str | None:
 
         return None
 
-    async def async_execute_command(self, command_name: str, *args: Any):
+    async def async_execute_command(self, command_name: str, *args: Any) -> None:
         """Execute device command in async context."""
         try:
             exec_id = await self.coordinator.client.execute_command(
@@ -118,11 +118,11 @@ async def async_cancel_command(self, commands_to_cancel: list[str]) -> bool:
 
         return False
 
-    async def async_cancel_execution(self, exec_id: str):
+    async def async_cancel_execution(self, exec_id: str) -> None:
         """Cancel running execution via execution id."""
         await self.coordinator.client.cancel_command(exec_id)
 
-    def get_gateway_id(self):
+    def get_gateway_id(self) -> str:
         """
         Retrieve gateway id from device url.
 
diff --git a/homeassistant/components/overkiz/light.py b/homeassistant/components/overkiz/light.py
index 63510f675670a8..8c93741dbb7393 100644
--- a/homeassistant/components/overkiz/light.py
+++ b/homeassistant/components/overkiz/light.py
@@ -28,7 +28,7 @@ async def async_setup_entry(
     hass: HomeAssistant,
     entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
-):
+) -> None:
     """Set up the Overkiz lights from a config entry."""
     data: HomeAssistantOverkizData = hass.data[DOMAIN][entry.entry_id]
 
diff --git a/homeassistant/components/overkiz/lock.py b/homeassistant/components/overkiz/lock.py
index c900b2faab8aca..8a333652b75f98 100644
--- a/homeassistant/components/overkiz/lock.py
+++ b/homeassistant/components/overkiz/lock.py
@@ -20,7 +20,7 @@ async def async_setup_entry(
     hass: HomeAssistant,
     entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
-):
+) -> None:
     """Set up the Overkiz locks from a config entry."""
     data: HomeAssistantOverkizData = hass.data[DOMAIN][entry.entry_id]
 
diff --git a/homeassistant/components/overkiz/number.py b/homeassistant/components/overkiz/number.py
index d13370207faa7c..bf5a0ce1a2466e 100644
--- a/homeassistant/components/overkiz/number.py
+++ b/homeassistant/components/overkiz/number.py
@@ -54,7 +54,7 @@ async def async_setup_entry(
     hass: HomeAssistant,
     entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
-):
+) -> None:
     """Set up the Overkiz number from a config entry."""
     data: HomeAssistantOverkizData = hass.data[DOMAIN][entry.entry_id]
     entities: list[OverkizNumber] = []
@@ -89,12 +89,12 @@ class OverkizNumber(OverkizDescriptiveEntity, NumberEntity):
     entity_description: OverkizNumberDescription
 
     @property
-    def value(self) -> float:
+    def value(self) -> float | None:
         """Return the entity value to represent the entity state."""
         if state := self.device.states.get(self.entity_description.key):
             return state.value
 
-        return 0
+        return None
 
     async def async_set_value(self, value: float) -> None:
         """Set new value."""
diff --git a/homeassistant/components/overkiz/scene.py b/homeassistant/components/overkiz/scene.py
index f64263fb26e14b..4cddd88e40d65a 100644
--- a/homeassistant/components/overkiz/scene.py
+++ b/homeassistant/components/overkiz/scene.py
@@ -20,7 +20,7 @@ async def async_setup_entry(
     hass: HomeAssistant,
     entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
-):
+) -> None:
     """Set up the Overkiz scenes from a config entry."""
     data: HomeAssistantOverkizData = hass.data[DOMAIN][entry.entry_id]
 
diff --git a/homeassistant/components/overkiz/sensor.py b/homeassistant/components/overkiz/sensor.py
index eb35e8b8208a76..a62bf57481944e 100644
--- a/homeassistant/components/overkiz/sensor.py
+++ b/homeassistant/components/overkiz/sensor.py
@@ -28,6 +28,7 @@
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity import DeviceInfo, EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import StateType
 
 from . import HomeAssistantOverkizData
 from .const import DOMAIN, IGNORED_OVERKIZ_DEVICES
@@ -54,7 +55,6 @@ class OverkizSensorDescription(SensorEntityDescription):
     OverkizSensorDescription(
         key=OverkizState.CORE_BATTERY,
         name="Battery",
-        device_class=SensorDeviceClass.BATTERY,
         native_value=lambda value: str(value).capitalize(),
         entity_category=EntityCategory.DIAGNOSTIC,
     ),
@@ -66,6 +66,7 @@ class OverkizSensorDescription(SensorEntityDescription):
         state_class=SensorStateClass.MEASUREMENT,
         native_value=lambda value: round(float(value)),
         entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
     ),
     OverkizSensorDescription(
         key=OverkizState.CORE_EXPECTED_NUMBER_OF_SHOWER,
@@ -126,7 +127,6 @@ class OverkizSensorDescription(SensorEntityDescription):
     OverkizSensorDescription(
         key=OverkizState.CORE_FOSSIL_ENERGY_CONSUMPTION,
         name="Fossil Energy Consumption",
-        device_class=SensorDeviceClass.ENERGY,
     ),
     OverkizSensorDescription(
         key=OverkizState.CORE_GAS_CONSUMPTION,
@@ -292,7 +292,6 @@ class OverkizSensorDescription(SensorEntityDescription):
         key=OverkizState.CORE_SUN_ENERGY,
         name="Sun Energy",
         native_value=lambda value: round(float(value), 2),
-        device_class=SensorDeviceClass.ENERGY,
         icon="mdi:solar-power",
         state_class=SensorStateClass.MEASUREMENT,
     ),
@@ -330,7 +329,6 @@ class OverkizSensorDescription(SensorEntityDescription):
         name="Discrete RSSI Level",
         entity_registry_enabled_default=False,
         native_value=lambda value: str(value).capitalize(),
-        device_class=SensorDeviceClass.SIGNAL_STRENGTH,
         entity_category=EntityCategory.DIAGNOSTIC,
     ),
     # DomesticHotWaterProduction/WaterHeatingSystem
@@ -349,7 +347,7 @@ async def async_setup_entry(
     hass: HomeAssistant,
     entry: ConfigEntry,
     async_add_entities: AddEntitiesCallback,
-):
+) -> None:
     """Set up the Overkiz sensors from a config entry."""
     data: HomeAssistantOverkizData = hass.data[DOMAIN][entry.entry_id]
     entities: list[SensorEntity] = []
@@ -392,7 +390,7 @@ class OverkizStateSensor(OverkizDescriptiveEntity, SensorEntity):
     entity_description: OverkizSensorDescription
 
     @property
-    def native_value(self):
+    def native_value(self) -> StateType:
         """Return the value of the sensor."""
         state = self.device.states.get(self.entity_description.key)
 
@@ -420,7 +418,7 @@ def __init__(
         self._attr_name = "HomeKit Setup Code"
 
     @property
-    def native_value(self):
+    def native_value(self) -> str:
         """Return the value of the sensor."""
         return self.device.attributes.get(OverkizAttribute.HOMEKIT_SETUP_CODE).value