diff --git a/CODEOWNERS b/CODEOWNERS
index d2a60cbb24667..92beb8946ba5a 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -1640,6 +1640,8 @@ build.json @home-assistant/supervisor
 /tests/components/webostv/ @thecode
 /homeassistant/components/websocket_api/ @home-assistant/core
 /tests/components/websocket_api/ @home-assistant/core
+/homeassistant/components/weheat/ @jesperraemaekers
+/tests/components/weheat/ @jesperraemaekers
 /homeassistant/components/wemo/ @esev
 /tests/components/wemo/ @esev
 /homeassistant/components/whirlpool/ @abmantis @mkmer
diff --git a/homeassistant/components/weheat/__init__.py b/homeassistant/components/weheat/__init__.py
new file mode 100644
index 0000000000000..4800046926dd9
--- /dev/null
+++ b/homeassistant/components/weheat/__init__.py
@@ -0,0 +1,49 @@
+"""The Weheat integration."""
+
+from __future__ import annotations
+
+from weheat.abstractions.discovery import HeatPumpDiscovery
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_ACCESS_TOKEN, Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.config_entry_oauth2_flow import (
+    OAuth2Session,
+    async_get_config_entry_implementation,
+)
+
+from .const import API_URL, LOGGER
+from .coordinator import WeheatDataUpdateCoordinator
+
+PLATFORMS: list[Platform] = [Platform.SENSOR]
+
+type WeheatConfigEntry = ConfigEntry[list[WeheatDataUpdateCoordinator]]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: WeheatConfigEntry) -> bool:
+    """Set up Weheat from a config entry."""
+    implementation = await async_get_config_entry_implementation(hass, entry)
+
+    session = OAuth2Session(hass, entry, implementation)
+
+    token = session.token[CONF_ACCESS_TOKEN]
+    entry.runtime_data = []
+
+    # fetch a list of the heat pumps the entry can access
+    for pump_info in await HeatPumpDiscovery.discover_active(API_URL, token):
+        LOGGER.debug("Adding %s", pump_info)
+        # for each pump, add a coordinator
+        new_coordinator = WeheatDataUpdateCoordinator(hass, session, pump_info)
+
+        await new_coordinator.async_config_entry_first_refresh()
+
+        entry.runtime_data.append(new_coordinator)
+
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: WeheatConfigEntry) -> bool:
+    """Unload a config entry."""
+    return await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
diff --git a/homeassistant/components/weheat/api.py b/homeassistant/components/weheat/api.py
new file mode 100644
index 0000000000000..1d0828aa41b1b
--- /dev/null
+++ b/homeassistant/components/weheat/api.py
@@ -0,0 +1,29 @@
+"""API for Weheat bound to Home Assistant OAuth."""
+
+from aiohttp import ClientSession
+from weheat.abstractions import AbstractAuth
+
+from homeassistant.const import CONF_ACCESS_TOKEN
+from homeassistant.helpers.config_entry_oauth2_flow import OAuth2Session
+
+from .const import API_URL
+
+
+class AsyncConfigEntryAuth(AbstractAuth):
+    """Provide Weheat authentication tied to an OAuth2 based config entry."""
+
+    def __init__(
+        self,
+        websession: ClientSession,
+        oauth_session: OAuth2Session,
+    ) -> None:
+        """Initialize Weheat auth."""
+        super().__init__(websession, host=API_URL)
+        self._oauth_session = oauth_session
+
+    async def async_get_access_token(self) -> str:
+        """Return a valid access token."""
+        if not self._oauth_session.valid_token:
+            await self._oauth_session.async_ensure_token_valid()
+
+        return self._oauth_session.token[CONF_ACCESS_TOKEN]
diff --git a/homeassistant/components/weheat/application_credentials.py b/homeassistant/components/weheat/application_credentials.py
new file mode 100644
index 0000000000000..3f85d4b055887
--- /dev/null
+++ b/homeassistant/components/weheat/application_credentials.py
@@ -0,0 +1,11 @@
+"""application_credentials platform the Weheat integration."""
+
+from homeassistant.components.application_credentials import AuthorizationServer
+from homeassistant.core import HomeAssistant
+
+from .const import OAUTH2_AUTHORIZE, OAUTH2_TOKEN
+
+
+async def async_get_authorization_server(hass: HomeAssistant) -> AuthorizationServer:
+    """Return authorization server."""
+    return AuthorizationServer(authorize_url=OAUTH2_AUTHORIZE, token_url=OAUTH2_TOKEN)
diff --git a/homeassistant/components/weheat/config_flow.py b/homeassistant/components/weheat/config_flow.py
new file mode 100644
index 0000000000000..707c2f6bc9795
--- /dev/null
+++ b/homeassistant/components/weheat/config_flow.py
@@ -0,0 +1,40 @@
+"""Config flow for Weheat."""
+
+import logging
+
+from weheat.abstractions.user import get_user_id_from_token
+
+from homeassistant.config_entries import ConfigFlowResult
+from homeassistant.const import CONF_ACCESS_TOKEN, CONF_TOKEN
+from homeassistant.helpers.config_entry_oauth2_flow import AbstractOAuth2FlowHandler
+
+from .const import API_URL, DOMAIN, ENTRY_TITLE, OAUTH2_SCOPES
+
+
+class OAuth2FlowHandler(AbstractOAuth2FlowHandler, domain=DOMAIN):
+    """Config flow to handle Weheat OAuth2 authentication."""
+
+    DOMAIN = DOMAIN
+
+    @property
+    def logger(self) -> logging.Logger:
+        """Return logger."""
+        return logging.getLogger(__name__)
+
+    @property
+    def extra_authorize_data(self) -> dict[str, str]:
+        """Extra data that needs to be appended to the authorize url."""
+        return {
+            "scope": " ".join(OAUTH2_SCOPES),
+        }
+
+    async def async_oauth_create_entry(self, data: dict) -> ConfigFlowResult:
+        """Override the create entry method to change to the step to find the heat pumps."""
+        # get the user id and use that as unique id for this entry
+        user_id = await get_user_id_from_token(
+            API_URL, data[CONF_TOKEN][CONF_ACCESS_TOKEN]
+        )
+        await self.async_set_unique_id(user_id)
+        self._abort_if_unique_id_configured()
+
+        return self.async_create_entry(title=ENTRY_TITLE, data=data)
diff --git a/homeassistant/components/weheat/const.py b/homeassistant/components/weheat/const.py
new file mode 100644
index 0000000000000..fa1b17f8c0728
--- /dev/null
+++ b/homeassistant/components/weheat/const.py
@@ -0,0 +1,25 @@
+"""Constants for the Weheat integration."""
+
+from logging import Logger, getLogger
+
+DOMAIN = "weheat"
+MANUFACTURER = "Weheat"
+ENTRY_TITLE = "Weheat cloud"
+ERROR_DESCRIPTION = "error_description"
+
+OAUTH2_AUTHORIZE = (
+    "https://auth.weheat.nl/auth/realms/Weheat/protocol/openid-connect/auth/"
+)
+OAUTH2_TOKEN = (
+    "https://auth.weheat.nl/auth/realms/Weheat/protocol/openid-connect/token/"
+)
+API_URL = "https://api.weheat.nl"
+OAUTH2_SCOPES = ["openid", "offline_access"]
+
+
+UPDATE_INTERVAL = 30
+
+LOGGER: Logger = getLogger(__package__)
+
+DISPLAY_PRECISION_WATTS = 0
+DISPLAY_PRECISION_COP = 1
diff --git a/homeassistant/components/weheat/coordinator.py b/homeassistant/components/weheat/coordinator.py
new file mode 100644
index 0000000000000..92c1299037119
--- /dev/null
+++ b/homeassistant/components/weheat/coordinator.py
@@ -0,0 +1,84 @@
+"""Define a custom coordinator for the Weheat heatpump integration."""
+
+from datetime import timedelta
+
+from weheat.abstractions.discovery import HeatPumpDiscovery
+from weheat.abstractions.heat_pump import HeatPump
+from weheat.exceptions import (
+    ApiException,
+    BadRequestException,
+    ForbiddenException,
+    NotFoundException,
+    ServiceException,
+    UnauthorizedException,
+)
+
+from homeassistant.const import CONF_ACCESS_TOKEN
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.config_entry_oauth2_flow import OAuth2Session
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
+
+from .const import API_URL, DOMAIN, LOGGER, UPDATE_INTERVAL
+
+EXCEPTIONS = (
+    ServiceException,
+    NotFoundException,
+    ForbiddenException,
+    UnauthorizedException,
+    BadRequestException,
+    ApiException,
+)
+
+
+class WeheatDataUpdateCoordinator(DataUpdateCoordinator[HeatPump]):
+    """A custom coordinator for the Weheat heatpump integration."""
+
+    def __init__(
+        self,
+        hass: HomeAssistant,
+        session: OAuth2Session,
+        heat_pump: HeatPumpDiscovery.HeatPumpInfo,
+    ) -> None:
+        """Initialize the data coordinator."""
+        super().__init__(
+            hass,
+            logger=LOGGER,
+            name=DOMAIN,
+            update_interval=timedelta(seconds=UPDATE_INTERVAL),
+        )
+        self._heat_pump_info = heat_pump
+        self._heat_pump_data = HeatPump(API_URL, self._heat_pump_info.uuid)
+
+        self.session = session
+
+    @property
+    def heatpump_id(self) -> str:
+        """Return the heat pump id."""
+        return self._heat_pump_info.uuid
+
+    @property
+    def readable_name(self) -> str | None:
+        """Return the readable name of the heat pump."""
+        if self._heat_pump_info.name:
+            return self._heat_pump_info.name
+        return self._heat_pump_info.model
+
+    @property
+    def model(self) -> str:
+        """Return the model of the heat pump."""
+        return self._heat_pump_info.model
+
+    def fetch_data(self) -> HeatPump:
+        """Get the data from the API."""
+        try:
+            self._heat_pump_data.get_status(self.session.token[CONF_ACCESS_TOKEN])
+        except EXCEPTIONS as error:
+            raise UpdateFailed(error) from error
+
+        return self._heat_pump_data
+
+    async def _async_update_data(self) -> HeatPump:
+        """Fetch data from the API."""
+        await self.session.async_ensure_token_valid()
+
+        return await self.hass.async_add_executor_job(self.fetch_data)
diff --git a/homeassistant/components/weheat/entity.py b/homeassistant/components/weheat/entity.py
new file mode 100644
index 0000000000000..079db596e192f
--- /dev/null
+++ b/homeassistant/components/weheat/entity.py
@@ -0,0 +1,27 @@
+"""Base entity for Weheat."""
+
+from homeassistant.helpers.device_registry import DeviceInfo
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from .const import DOMAIN, MANUFACTURER
+from .coordinator import WeheatDataUpdateCoordinator
+
+
+class WeheatEntity(CoordinatorEntity[WeheatDataUpdateCoordinator]):
+    """Defines a base Weheat entity."""
+
+    _attr_has_entity_name = True
+
+    def __init__(
+        self,
+        coordinator: WeheatDataUpdateCoordinator,
+    ) -> None:
+        """Initialize the Weheat entity."""
+        super().__init__(coordinator)
+
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, coordinator.heatpump_id)},
+            name=coordinator.readable_name,
+            manufacturer=MANUFACTURER,
+            model=coordinator.model,
+        )
diff --git a/homeassistant/components/weheat/icons.json b/homeassistant/components/weheat/icons.json
new file mode 100644
index 0000000000000..b1eaf481bfa6c
--- /dev/null
+++ b/homeassistant/components/weheat/icons.json
@@ -0,0 +1,15 @@
+{
+  "entity": {
+    "sensor": {
+      "power_output": {
+        "default": "mdi:heat-wave"
+      },
+      "power_input": {
+        "default": "mdi:lightning-bolt"
+      },
+      "cop": {
+        "default": "mdi:speedometer"
+      }
+    }
+  }
+}
diff --git a/homeassistant/components/weheat/manifest.json b/homeassistant/components/weheat/manifest.json
new file mode 100644
index 0000000000000..2dfceacb6359d
--- /dev/null
+++ b/homeassistant/components/weheat/manifest.json
@@ -0,0 +1,10 @@
+{
+  "domain": "weheat",
+  "name": "Weheat",
+  "codeowners": ["@jesperraemaekers"],
+  "config_flow": true,
+  "dependencies": ["application_credentials"],
+  "documentation": "https://www.home-assistant.io/integrations/weheat",
+  "iot_class": "cloud_polling",
+  "requirements": ["weheat==2024.09.05"]
+}
diff --git a/homeassistant/components/weheat/sensor.py b/homeassistant/components/weheat/sensor.py
new file mode 100644
index 0000000000000..a5bbc66001c09
--- /dev/null
+++ b/homeassistant/components/weheat/sensor.py
@@ -0,0 +1,95 @@
+"""Platform for sensor integration."""
+
+from collections.abc import Callable
+from dataclasses import dataclass
+
+from weheat.abstractions.heat_pump import HeatPump
+
+from homeassistant.components.sensor import (
+    SensorDeviceClass,
+    SensorEntity,
+    SensorEntityDescription,
+    SensorStateClass,
+)
+from homeassistant.const import UnitOfPower
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import StateType
+
+from . import WeheatConfigEntry
+from .const import DISPLAY_PRECISION_COP, DISPLAY_PRECISION_WATTS
+from .coordinator import WeheatDataUpdateCoordinator
+from .entity import WeheatEntity
+
+
+@dataclass(frozen=True, kw_only=True)
+class WeHeatSensorEntityDescription(SensorEntityDescription):
+    """Describes Weheat sensor entity."""
+
+    value_fn: Callable[[HeatPump], StateType]
+
+
+SENSORS = [
+    WeHeatSensorEntityDescription(
+        translation_key="power_output",
+        key="power_output",
+        native_unit_of_measurement=UnitOfPower.WATT,
+        device_class=SensorDeviceClass.POWER,
+        state_class=SensorStateClass.MEASUREMENT,
+        suggested_display_precision=DISPLAY_PRECISION_WATTS,
+        value_fn=lambda status: status.power_output,
+    ),
+    WeHeatSensorEntityDescription(
+        translation_key="power_input",
+        key="power_input",
+        native_unit_of_measurement=UnitOfPower.WATT,
+        device_class=SensorDeviceClass.POWER,
+        state_class=SensorStateClass.MEASUREMENT,
+        suggested_display_precision=DISPLAY_PRECISION_WATTS,
+        value_fn=lambda status: status.power_input,
+    ),
+    WeHeatSensorEntityDescription(
+        translation_key="cop",
+        key="cop",
+        state_class=SensorStateClass.MEASUREMENT,
+        suggested_display_precision=DISPLAY_PRECISION_COP,
+        value_fn=lambda status: status.cop,
+    ),
+]
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: WeheatConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up the sensors for weheat heat pump."""
+    async_add_entities(
+        WeheatHeatPumpSensor(coordinator, entity_description)
+        for entity_description in SENSORS
+        for coordinator in entry.runtime_data
+    )
+
+
+class WeheatHeatPumpSensor(WeheatEntity, SensorEntity):
+    """Defines a Weheat heat pump sensor."""
+
+    coordinator: WeheatDataUpdateCoordinator
+    entity_description: WeHeatSensorEntityDescription
+
+    def __init__(
+        self,
+        coordinator: WeheatDataUpdateCoordinator,
+        entity_description: WeHeatSensorEntityDescription,
+    ) -> None:
+        """Pass coordinator to CoordinatorEntity."""
+        super().__init__(coordinator)
+
+        self.entity_description = entity_description
+
+        self._attr_unique_id = f"{coordinator.heatpump_id}_{entity_description.key}"
+
+    @property
+    def native_value(self) -> StateType:
+        """Return the state of the sensor."""
+        return self.entity_description.value_fn(self.coordinator.data)
diff --git a/homeassistant/components/weheat/strings.json b/homeassistant/components/weheat/strings.json
new file mode 100644
index 0000000000000..63871b065b694
--- /dev/null
+++ b/homeassistant/components/weheat/strings.json
@@ -0,0 +1,46 @@
+{
+  "config": {
+    "step": {
+      "pick_implementation": {
+        "title": "[%key:common::config_flow::title::oauth2_pick_implementation%]"
+      },
+      "find_devices": {
+        "title": "Select your heat pump"
+      },
+      "reauth_confirm": {
+        "title": "Re-authenticate with WeHeat",
+        "description": "You need to re-authenticate with WeHeat to continue"
+      }
+    },
+    "abort": {
+      "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
+      "already_in_progress": "[%key:common::config_flow::abort::already_in_progress%]",
+      "oauth_error": "[%key:common::config_flow::abort::oauth2_error%]",
+      "oauth_failed": "[%key:common::config_flow::abort::oauth2_failed%]",
+      "oauth_timeout": "[%key:common::config_flow::abort::oauth2_timeout%]",
+      "oauth_unauthorized": "[%key:common::config_flow::abort::oauth2_unauthorized%]",
+      "missing_configuration": "[%key:common::config_flow::abort::oauth2_missing_configuration%]",
+      "authorize_url_timeout": "[%key:common::config_flow::abort::oauth2_authorize_url_timeout%]",
+      "no_url_available": "[%key:common::config_flow::abort::oauth2_no_url_available%]",
+      "user_rejected_authorize": "[%key:common::config_flow::abort::oauth2_user_rejected_authorize%]",
+      "reauth_successful": "[%key:common::config_flow::abort::reauth_successful%]",
+      "no_devices_found": "Could not find any heat pumps on this account"
+    },
+    "create_entry": {
+      "default": "[%key:common::config_flow::create_entry::authenticated%]"
+    }
+  },
+  "entity": {
+    "sensor": {
+      "power_output": {
+        "name": "Output power"
+      },
+      "power_input": {
+        "name": "Input power"
+      },
+      "cop": {
+        "name": "COP"
+      }
+    }
+  }
+}
diff --git a/homeassistant/generated/application_credentials.py b/homeassistant/generated/application_credentials.py
index efb6f426d3643..359ef656290d9 100644
--- a/homeassistant/generated/application_credentials.py
+++ b/homeassistant/generated/application_credentials.py
@@ -28,6 +28,7 @@
     "spotify",
     "tesla_fleet",
     "twitch",
+    "weheat",
     "withings",
     "xbox",
     "yale",
diff --git a/homeassistant/generated/config_flows.py b/homeassistant/generated/config_flows.py
index 9f4b4e42bb049..f03c980a2d48a 100644
--- a/homeassistant/generated/config_flows.py
+++ b/homeassistant/generated/config_flows.py
@@ -656,6 +656,7 @@
         "weatherkit",
         "webmin",
         "webostv",
+        "weheat",
         "wemo",
         "whirlpool",
         "whois",
diff --git a/homeassistant/generated/integrations.json b/homeassistant/generated/integrations.json
index b4c80aa70b43a..eab7bf224d276 100644
--- a/homeassistant/generated/integrations.json
+++ b/homeassistant/generated/integrations.json
@@ -6854,6 +6854,12 @@
       "config_flow": true,
       "iot_class": "local_polling"
     },
+    "weheat": {
+      "name": "Weheat",
+      "integration_type": "hub",
+      "config_flow": true,
+      "iot_class": "cloud_polling"
+    },
     "wemo": {
       "name": "Belkin WeMo",
       "integration_type": "hub",
diff --git a/requirements_all.txt b/requirements_all.txt
index 82cabd124d8ba..6796a83c9c6f5 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2947,6 +2947,9 @@ weatherflow4py==0.2.23
 # homeassistant.components.webmin
 webmin-xmlrpc==0.0.2
 
+# homeassistant.components.weheat
+weheat==2024.09.05
+
 # homeassistant.components.whirlpool
 whirlpool-sixth-sense==0.18.8
 
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index f0ac4294adaad..df33037cf4c17 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -2333,6 +2333,9 @@ weatherflow4py==0.2.23
 # homeassistant.components.webmin
 webmin-xmlrpc==0.0.2
 
+# homeassistant.components.weheat
+weheat==2024.09.05
+
 # homeassistant.components.whirlpool
 whirlpool-sixth-sense==0.18.8
 
diff --git a/tests/components/weheat/__init__.py b/tests/components/weheat/__init__.py
new file mode 100644
index 0000000000000..c077280ccb569
--- /dev/null
+++ b/tests/components/weheat/__init__.py
@@ -0,0 +1 @@
+"""Tests for the Weheat integration."""
diff --git a/tests/components/weheat/conftest.py b/tests/components/weheat/conftest.py
new file mode 100644
index 0000000000000..831d4d460aca4
--- /dev/null
+++ b/tests/components/weheat/conftest.py
@@ -0,0 +1,36 @@
+"""Fixtures for Weheat tests."""
+
+from unittest.mock import patch
+
+import pytest
+
+from homeassistant.components.application_credentials import (
+    DOMAIN as APPLICATION_CREDENTIALS,
+    ClientCredential,
+    async_import_client_credential,
+)
+from homeassistant.components.weheat.const import DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
+
+from .const import CLIENT_ID, CLIENT_SECRET
+
+
+@pytest.fixture(autouse=True)
+async def setup_credentials(hass: HomeAssistant) -> None:
+    """Fixture to setup credentials."""
+    assert await async_setup_component(hass, APPLICATION_CREDENTIALS, {})
+    await async_import_client_credential(
+        hass,
+        DOMAIN,
+        ClientCredential(CLIENT_ID, CLIENT_SECRET),
+    )
+
+
+@pytest.fixture
+def mock_setup_entry():
+    """Mock a successful setup."""
+    with patch(
+        "homeassistant.components.weheat.async_setup_entry", return_value=True
+    ) as mock_setup:
+        yield mock_setup
diff --git a/tests/components/weheat/const.py b/tests/components/weheat/const.py
new file mode 100644
index 0000000000000..01733de1c916d
--- /dev/null
+++ b/tests/components/weheat/const.py
@@ -0,0 +1,11 @@
+"""Constants for weheat tests."""
+
+CLIENT_ID = "1234"
+CLIENT_SECRET = "5678"
+
+USER_UUID_1 = "0000-1111-2222-3333"
+
+CONF_REFRESH_TOKEN = "refresh_token"
+CONF_AUTH_IMPLEMENTATION = "auth_implementation"
+MOCK_REFRESH_TOKEN = "mock_refresh_token"
+MOCK_ACCESS_TOKEN = "mock_access_token"
diff --git a/tests/components/weheat/test_config_flow.py b/tests/components/weheat/test_config_flow.py
new file mode 100644
index 0000000000000..c065d011e4220
--- /dev/null
+++ b/tests/components/weheat/test_config_flow.py
@@ -0,0 +1,137 @@
+"""Test the Weheat config flow."""
+
+from unittest.mock import patch
+
+import pytest
+
+from homeassistant.components.weheat.const import (
+    DOMAIN,
+    ENTRY_TITLE,
+    OAUTH2_AUTHORIZE,
+    OAUTH2_TOKEN,
+)
+from homeassistant.config_entries import SOURCE_USER, ConfigFlowResult
+from homeassistant.const import CONF_ACCESS_TOKEN, CONF_SOURCE, CONF_TOKEN
+from homeassistant.core import HomeAssistant
+from homeassistant.data_entry_flow import FlowResultType
+from homeassistant.helpers import config_entry_oauth2_flow
+
+from .const import (
+    CLIENT_ID,
+    CONF_AUTH_IMPLEMENTATION,
+    CONF_REFRESH_TOKEN,
+    MOCK_ACCESS_TOKEN,
+    MOCK_REFRESH_TOKEN,
+    USER_UUID_1,
+)
+
+from tests.common import MockConfigEntry
+from tests.test_util.aiohttp import AiohttpClientMocker
+from tests.typing import ClientSessionGenerator
+
+
+@pytest.mark.usefixtures("current_request_with_host")
+async def test_full_flow(
+    hass: HomeAssistant,
+    hass_client_no_auth: ClientSessionGenerator,
+    aioclient_mock: AiohttpClientMocker,
+    mock_setup_entry,
+) -> None:
+    """Check full of adding a single heat pump."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={CONF_SOURCE: SOURCE_USER}
+    )
+
+    await handle_oauth(hass, hass_client_no_auth, aioclient_mock, result)
+
+    with (
+        patch(
+            "homeassistant.components.weheat.config_flow.get_user_id_from_token",
+            return_value=USER_UUID_1,
+        ) as mock_weheat,
+    ):
+        result = await hass.config_entries.flow.async_configure(result["flow_id"])
+
+    assert len(hass.config_entries.async_entries(DOMAIN)) == 1
+    assert len(mock_setup_entry.mock_calls) == 1
+    assert len(mock_weheat.mock_calls) == 1
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["result"].unique_id == USER_UUID_1
+    assert result["result"].title == ENTRY_TITLE
+    assert result["data"][CONF_TOKEN][CONF_REFRESH_TOKEN] == MOCK_REFRESH_TOKEN
+    assert result["data"][CONF_TOKEN][CONF_ACCESS_TOKEN] == MOCK_ACCESS_TOKEN
+    assert result["data"][CONF_AUTH_IMPLEMENTATION] == DOMAIN
+
+
+@pytest.mark.usefixtures("current_request_with_host")
+async def test_duplicate_unique_id(
+    hass: HomeAssistant,
+    hass_client_no_auth: ClientSessionGenerator,
+    aioclient_mock: AiohttpClientMocker,
+    mock_setup_entry,
+) -> None:
+    """Check that the config flow is aborted when an entry with the same ID exists."""
+    first_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={},
+        unique_id=USER_UUID_1,
+    )
+
+    first_entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={CONF_SOURCE: SOURCE_USER}
+    )
+
+    await handle_oauth(hass, hass_client_no_auth, aioclient_mock, result)
+
+    with (
+        patch(
+            "homeassistant.components.weheat.config_flow.get_user_id_from_token",
+            return_value=USER_UUID_1,
+        ),
+    ):
+        result = await hass.config_entries.flow.async_configure(result["flow_id"])
+
+    # only care that the config flow is aborted
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "already_configured"
+
+
+async def handle_oauth(
+    hass: HomeAssistant,
+    hass_client_no_auth: ClientSessionGenerator,
+    aioclient_mock: AiohttpClientMocker,
+    result: ConfigFlowResult,
+) -> None:
+    """Handle the Oauth2 part of the flow."""
+    state = config_entry_oauth2_flow._encode_jwt(
+        hass,
+        {
+            "flow_id": result["flow_id"],
+            "redirect_uri": "https://example.com/auth/external/callback",
+        },
+    )
+
+    assert result["url"] == (
+        f"{OAUTH2_AUTHORIZE}?response_type=code&client_id={CLIENT_ID}"
+        "&redirect_uri=https://example.com/auth/external/callback"
+        f"&state={state}"
+        "&scope=openid+offline_access"
+    )
+
+    client = await hass_client_no_auth()
+    resp = await client.get(f"/auth/external/callback?code=abcd&state={state}")
+    assert resp.status == 200
+    assert resp.headers["content-type"] == "text/html; charset=utf-8"
+
+    aioclient_mock.post(
+        OAUTH2_TOKEN,
+        json={
+            "refresh_token": MOCK_REFRESH_TOKEN,
+            "access_token": MOCK_ACCESS_TOKEN,
+            "type": "Bearer",
+            "expires_in": 60,
+        },
+    )