diff --git a/homeassistant/components/rainbird/binary_sensor.py b/homeassistant/components/rainbird/binary_sensor.py
index 3333d8bc4cb..142e8ecc4b8 100644
--- a/homeassistant/components/rainbird/binary_sensor.py
+++ b/homeassistant/components/rainbird/binary_sensor.py
@@ -48,7 +48,7 @@ class RainBirdSensor(CoordinatorEntity[RainbirdUpdateCoordinator], BinarySensorE
         """Initialize the Rain Bird sensor."""
         super().__init__(coordinator)
         self.entity_description = description
-        if coordinator.unique_id:
+        if coordinator.unique_id is not None:
             self._attr_unique_id = f"{coordinator.unique_id}-{description.key}"
             self._attr_device_info = coordinator.device_info
         else:
diff --git a/homeassistant/components/rainbird/coordinator.py b/homeassistant/components/rainbird/coordinator.py
index 763e50fe5d9..9f1ea95b333 100644
--- a/homeassistant/components/rainbird/coordinator.py
+++ b/homeassistant/components/rainbird/coordinator.py
@@ -84,7 +84,7 @@ class RainbirdUpdateCoordinator(DataUpdateCoordinator[RainbirdDeviceState]):
     @property
     def device_info(self) -> DeviceInfo | None:
         """Return information about the device."""
-        if not self._unique_id:
+        if self._unique_id is None:
             return None
         return DeviceInfo(
             name=self.device_name,
diff --git a/tests/components/rainbird/test_binary_sensor.py b/tests/components/rainbird/test_binary_sensor.py
index e372a10ae23..24cd1750ed4 100644
--- a/tests/components/rainbird/test_binary_sensor.py
+++ b/tests/components/rainbird/test_binary_sensor.py
@@ -7,7 +7,7 @@ from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
 
-from .conftest import RAIN_SENSOR_OFF, RAIN_SENSOR_ON, ComponentSetup
+from .conftest import RAIN_SENSOR_OFF, RAIN_SENSOR_ON, SERIAL_NUMBER, ComponentSetup
 
 from tests.test_util.aiohttp import AiohttpClientMockResponse
 
@@ -41,11 +41,38 @@ async def test_rainsensor(
         "icon": "mdi:water",
     }
 
+
+@pytest.mark.parametrize(
+    ("config_entry_unique_id", "entity_unique_id"),
+    [
+        (SERIAL_NUMBER, "1263613994342-rainsensor"),
+        # Some existing config entries may have a "0" serial number but preserve
+        # their unique id
+        (0, "0-rainsensor"),
+    ],
+)
+async def test_unique_id(
+    hass: HomeAssistant,
+    setup_integration: ComponentSetup,
+    entity_registry: er.EntityRegistry,
+    entity_unique_id: str,
+) -> None:
+    """Test rainsensor binary sensor."""
+
+    assert await setup_integration()
+
+    rainsensor = hass.states.get("binary_sensor.rain_bird_controller_rainsensor")
+    assert rainsensor is not None
+    assert rainsensor.attributes == {
+        "friendly_name": "Rain Bird Controller Rainsensor",
+        "icon": "mdi:water",
+    }
+
     entity_entry = entity_registry.async_get(
         "binary_sensor.rain_bird_controller_rainsensor"
     )
     assert entity_entry
-    assert entity_entry.unique_id == "1263613994342-rainsensor"
+    assert entity_entry.unique_id == entity_unique_id
 
 
 @pytest.mark.parametrize(
diff --git a/tests/components/rainbird/test_number.py b/tests/components/rainbird/test_number.py
index 5d208f08a25..b3cfd56832d 100644
--- a/tests/components/rainbird/test_number.py
+++ b/tests/components/rainbird/test_number.py
@@ -63,6 +63,36 @@ async def test_number_values(
     assert entity_entry.unique_id == "1263613994342-rain-delay"
 
 
+@pytest.mark.parametrize(
+    ("config_entry_unique_id", "entity_unique_id"),
+    [
+        (SERIAL_NUMBER, "1263613994342-rain-delay"),
+        # Some existing config entries may have a "0" serial number but preserve
+        # their unique id
+        (0, "0-rain-delay"),
+    ],
+)
+async def test_unique_id(
+    hass: HomeAssistant,
+    setup_integration: ComponentSetup,
+    entity_registry: er.EntityRegistry,
+    entity_unique_id: str,
+) -> None:
+    """Test number platform."""
+
+    assert await setup_integration()
+
+    raindelay = hass.states.get("number.rain_bird_controller_rain_delay")
+    assert raindelay is not None
+    assert (
+        raindelay.attributes.get("friendly_name") == "Rain Bird Controller Rain delay"
+    )
+
+    entity_entry = entity_registry.async_get("number.rain_bird_controller_rain_delay")
+    assert entity_entry
+    assert entity_entry.unique_id == entity_unique_id
+
+
 async def test_set_value(
     hass: HomeAssistant,
     setup_integration: ComponentSetup,