diff --git a/homeassistant/components/meater/__init__.py b/homeassistant/components/meater/__init__.py
index 0a9fa77f902..212e8a2a33a 100644
--- a/homeassistant/components/meater/__init__.py
+++ b/homeassistant/components/meater/__init__.py
@@ -3,7 +3,7 @@
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 
-from .const import DOMAIN
+from .const import MEATER_DATA
 from .coordinator import MeaterConfigEntry, MeaterCoordinator
 
 PLATFORMS = [Platform.SENSOR]
@@ -15,7 +15,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: MeaterConfigEntry) -> bo
     coordinator = MeaterCoordinator(hass, entry)
     await coordinator.async_config_entry_first_refresh()
 
-    hass.data.setdefault(DOMAIN, {}).setdefault("known_probes", set())
+    hass.data.setdefault(MEATER_DATA, set())
 
     entry.runtime_data = coordinator
 
diff --git a/homeassistant/components/meater/const.py b/homeassistant/components/meater/const.py
index 6b40aa18d59..ac3a238856b 100644
--- a/homeassistant/components/meater/const.py
+++ b/homeassistant/components/meater/const.py
@@ -1,3 +1,7 @@
 """Constants for the Meater Temperature Probe integration."""
 
+from homeassistant.util.hass_dict import HassKey
+
 DOMAIN = "meater"
+
+MEATER_DATA: HassKey[set[str]] = HassKey(DOMAIN)
diff --git a/homeassistant/components/meater/sensor.py b/homeassistant/components/meater/sensor.py
index 2369ab30b16..6f180386520 100644
--- a/homeassistant/components/meater/sensor.py
+++ b/homeassistant/components/meater/sensor.py
@@ -22,7 +22,7 @@ from homeassistant.helpers.update_coordinator import CoordinatorEntity
 from homeassistant.util import dt as dt_util
 
 from . import MeaterCoordinator
-from .const import DOMAIN
+from .const import DOMAIN, MEATER_DATA
 from .coordinator import MeaterConfigEntry
 
 COOK_STATES = {
@@ -163,7 +163,7 @@ async def async_setup_entry(
 
         devices = coordinator.data
         entities = []
-        known_probes: set = hass.data[DOMAIN]["known_probes"]
+        known_probes = hass.data[MEATER_DATA]
 
         # Add entities for temperature probes which we've not yet seen
         for device_id in devices:
diff --git a/tests/components/meater/test_config_flow.py b/tests/components/meater/test_config_flow.py
index c6704f2f3f7..9579ba3c1e9 100644
--- a/tests/components/meater/test_config_flow.py
+++ b/tests/components/meater/test_config_flow.py
@@ -5,7 +5,7 @@ from unittest.mock import AsyncMock
 from meater import AuthenticationError, ServiceUnavailableError
 import pytest
 
-from homeassistant.components.meater import DOMAIN
+from homeassistant.components.meater.const import DOMAIN
 from homeassistant.config_entries import SOURCE_USER
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 from homeassistant.core import HomeAssistant