diff --git a/homeassistant/components/vallox/__init__.py b/homeassistant/components/vallox/__init__.py
index 63b594a5bf2..73dc633834e 100644
--- a/homeassistant/components/vallox/__init__.py
+++ b/homeassistant/components/vallox/__init__.py
@@ -5,9 +5,11 @@ from dataclasses import dataclass, field
 import ipaddress
 import logging
 from typing import Any, NamedTuple
+from uuid import UUID
 
 from vallox_websocket_api import PROFILE as VALLOX_PROFILE, Vallox
 from vallox_websocket_api.exceptions import ValloxApiException
+from vallox_websocket_api.vallox import get_uuid as calculate_uuid
 import voluptuous as vol
 
 from homeassistant.const import CONF_HOST, CONF_NAME, EVENT_HOMEASSISTANT_STARTED
@@ -114,6 +116,13 @@ class ValloxState:
 
         return value
 
+    def get_uuid(self) -> UUID | None:
+        """Return cached UUID value."""
+        uuid = calculate_uuid(self.metric_cache)
+        if not isinstance(uuid, UUID):
+            raise ValueError
+        return uuid
+
 
 class ValloxDataUpdateCoordinator(DataUpdateCoordinator):
     """The DataUpdateCoordinator for Vallox."""
diff --git a/homeassistant/components/vallox/fan.py b/homeassistant/components/vallox/fan.py
index 4d621615aef..6de30302838 100644
--- a/homeassistant/components/vallox/fan.py
+++ b/homeassistant/components/vallox/fan.py
@@ -99,6 +99,8 @@ class ValloxFan(CoordinatorEntity, FanEntity):
 
         self._attr_name = name
 
+        self._attr_unique_id = str(self.coordinator.data.get_uuid())
+
     @property
     def supported_features(self) -> int:
         """Flag supported features."""
diff --git a/homeassistant/components/vallox/sensor.py b/homeassistant/components/vallox/sensor.py
index 0b96316b766..17bcf0e4499 100644
--- a/homeassistant/components/vallox/sensor.py
+++ b/homeassistant/components/vallox/sensor.py
@@ -52,6 +52,9 @@ class ValloxSensor(CoordinatorEntity, SensorEntity):
 
         self._attr_name = f"{name} {description.name}"
 
+        uuid = self.coordinator.data.get_uuid()
+        self._attr_unique_id = f"{uuid}-{description.key}"
+
     @property
     def native_value(self) -> StateType:
         """Return the value reported by the sensor."""