diff --git a/.coveragerc b/.coveragerc
index 9aafc4300cb..fa31616541d 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -833,6 +833,8 @@ omit =
     homeassistant/components/nextcloud/*
     homeassistant/components/nfandroidtv/__init__.py
     homeassistant/components/nfandroidtv/notify.py
+    homeassistant/components/nibe_heatpump/__init__.py
+    homeassistant/components/nibe_heatpump/sensor.py
     homeassistant/components/niko_home_control/light.py
     homeassistant/components/nilu/air_quality.py
     homeassistant/components/nissan_leaf/*
diff --git a/CODEOWNERS b/CODEOWNERS
index 1e3a06f16c7..9c25b5a3eed 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -747,6 +747,8 @@ build.json @home-assistant/supervisor
 /tests/components/nextdns/ @bieniu
 /homeassistant/components/nfandroidtv/ @tkdrob
 /tests/components/nfandroidtv/ @tkdrob
+/homeassistant/components/nibe_heatpump/ @elupus
+/tests/components/nibe_heatpump/ @elupus
 /homeassistant/components/nightscout/ @marciogranzotto
 /tests/components/nightscout/ @marciogranzotto
 /homeassistant/components/nilu/ @hfurubotten
diff --git a/homeassistant/components/nibe_heatpump/__init__.py b/homeassistant/components/nibe_heatpump/__init__.py
new file mode 100644
index 00000000000..343452c9f45
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/__init__.py
@@ -0,0 +1,226 @@
+"""The Nibe Heat Pump integration."""
+from __future__ import annotations
+
+from datetime import timedelta
+
+from nibe.coil import Coil
+from nibe.connection import Connection
+from nibe.connection.nibegw import NibeGW
+from nibe.exceptions import CoilNotFoundException, CoilReadException
+from nibe.heatpump import HeatPump, Model
+from tenacity import RetryError, retry, retry_if_exception_type, stop_after_attempt
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_IP_ADDRESS, CONF_MODEL, Platform
+from homeassistant.core import CALLBACK_TYPE, HomeAssistant
+from homeassistant.exceptions import ConfigEntryNotReady, HomeAssistantError
+from homeassistant.helpers import device_registry as dr
+from homeassistant.helpers.entity import DeviceInfo, async_generate_entity_id
+from homeassistant.helpers.update_coordinator import (
+    CoordinatorEntity,
+    DataUpdateCoordinator,
+)
+
+from .const import (
+    CONF_CONNECTION_TYPE,
+    CONF_CONNECTION_TYPE_NIBEGW,
+    CONF_LISTENING_PORT,
+    CONF_REMOTE_READ_PORT,
+    CONF_REMOTE_WRITE_PORT,
+    CONF_WORD_SWAP,
+    DOMAIN,
+    LOGGER,
+)
+
+PLATFORMS: list[Platform] = [Platform.SENSOR]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Set up Nibe Heat Pump from a config entry."""
+
+    heatpump = HeatPump(Model[entry.data[CONF_MODEL]])
+    heatpump.word_swap = entry.data[CONF_WORD_SWAP]
+    heatpump.initialize()
+
+    connection_type = entry.data[CONF_CONNECTION_TYPE]
+
+    if connection_type == CONF_CONNECTION_TYPE_NIBEGW:
+        connection = NibeGW(
+            heatpump,
+            entry.data[CONF_IP_ADDRESS],
+            entry.data[CONF_REMOTE_READ_PORT],
+            entry.data[CONF_REMOTE_WRITE_PORT],
+            listening_port=entry.data[CONF_LISTENING_PORT],
+        )
+    else:
+        raise HomeAssistantError(f"Connection type {connection_type} is not supported.")
+
+    await connection.start()
+    coordinator = Coordinator(hass, heatpump, connection)
+
+    data = hass.data.setdefault(DOMAIN, {})
+    data[entry.entry_id] = coordinator
+
+    try:
+        await coordinator.async_config_entry_first_refresh()
+    except ConfigEntryNotReady:
+        await connection.stop()
+        raise
+
+    reg = dr.async_get(hass)
+    reg.async_get_or_create(
+        config_entry_id=entry.entry_id,
+        identifiers={(DOMAIN, entry.unique_id or entry.entry_id)},
+        manufacturer="NIBE Energy Systems",
+        model=heatpump.model.name,
+        name=heatpump.model.name,
+    )
+
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+
+    # Trigger a refresh again now that all platforms have registered
+    hass.async_create_task(coordinator.async_refresh())
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Unload a config entry."""
+    if unload_ok := await hass.config_entries.async_unload_platforms(entry, PLATFORMS):
+        coordinator: Coordinator = hass.data[DOMAIN].pop(entry.entry_id)
+        await coordinator.connection.stop()
+
+    return unload_ok
+
+
+class Coordinator(DataUpdateCoordinator[dict[int, Coil]]):
+    """Update coordinator for nibe heat pumps."""
+
+    config_entry: ConfigEntry
+
+    def __init__(
+        self,
+        hass: HomeAssistant,
+        heatpump: HeatPump,
+        connection: Connection,
+    ) -> None:
+        """Initialize coordinator."""
+        super().__init__(
+            hass, LOGGER, name="Nibe Heat Pump", update_interval=timedelta(seconds=60)
+        )
+
+        self.data = {}
+        self.connection = connection
+        self.heatpump = heatpump
+
+    @property
+    def coils(self) -> list[Coil]:
+        """Return the full coil database."""
+        return self.heatpump.get_coils()
+
+    @property
+    def unique_id(self) -> str:
+        """Return unique id for this coordinator."""
+        return self.config_entry.unique_id or self.config_entry.entry_id
+
+    @property
+    def device_info(self) -> DeviceInfo:
+        """Return device information for the main device."""
+        return DeviceInfo(identifiers={(DOMAIN, self.unique_id)})
+
+    def get_coil_value(self, coil: Coil) -> int | str | float | None:
+        """Return a coil with data and check for validity."""
+        if coil := self.data.get(coil.address):
+            return coil.value
+        return None
+
+    def get_coil_float(self, coil: Coil) -> float | None:
+        """Return a coil with float and check for validity."""
+        if value := self.get_coil_value(coil):
+            return float(value)
+        return None
+
+    async def async_write_coil(
+        self, coil: Coil | None, value: int | float | str
+    ) -> None:
+        """Write coil and update state."""
+        if not coil:
+            raise HomeAssistantError("No coil available")
+
+        coil.value = value
+        coil = await self.connection.write_coil(coil)
+
+        if self.data:
+            self.data[coil.address] = coil
+            self.async_update_listeners()
+
+    async def _async_update_data(self) -> dict[int, Coil]:
+        @retry(
+            retry=retry_if_exception_type(CoilReadException), stop=stop_after_attempt(2)
+        )
+        async def read_coil(coil: Coil):
+            return await self.connection.read_coil(coil)
+
+        callbacks: dict[int, list[CALLBACK_TYPE]] = {}
+        for update_callback, context in list(self._listeners.values()):
+            assert isinstance(context, set)
+            for address in context:
+                callbacks.setdefault(address, []).append(update_callback)
+
+        result: dict[int, Coil] = {}
+
+        for address, callback_list in callbacks.items():
+            try:
+                coil = self.heatpump.get_coil_by_address(address)
+                self.data[coil.address] = result[coil.address] = await read_coil(coil)
+            except (CoilReadException, RetryError) as exception:
+                self.logger.warning("Failed to update: %s", exception)
+            except CoilNotFoundException as exception:
+                self.logger.debug("Skipping missing coil: %s", exception)
+
+            for update_callback in callback_list:
+                update_callback()
+
+        return result
+
+
+class CoilEntity(CoordinatorEntity[Coordinator]):
+    """Base for coil based entities."""
+
+    _attr_has_entity_name = True
+    _attr_entity_registry_enabled_default = False
+
+    def __init__(
+        self, coordinator: Coordinator, coil: Coil, entity_format: str
+    ) -> None:
+        """Initialize base entity."""
+        super().__init__(coordinator, {coil.address})
+        self.entity_id = async_generate_entity_id(
+            entity_format, coil.name, hass=coordinator.hass
+        )
+        self._attr_name = coil.title
+        self._attr_unique_id = f"{coordinator.unique_id}-{coil.address}"
+        self._attr_device_info = coordinator.device_info
+        self._coil = coil
+
+    @property
+    def available(self) -> bool:
+        """Return if entity is available."""
+        return self.coordinator.last_update_success and self._coil.address in (
+            self.coordinator.data or {}
+        )
+
+    def _async_read_coil(self, coil: Coil):
+        """Update state of entity based on coil data."""
+
+    async def _async_write_coil(self, value: int | float | str):
+        """Write coil and update state."""
+        await self.coordinator.async_write_coil(self._coil, value)
+
+    def _handle_coordinator_update(self) -> None:
+        coil = self.coordinator.data.get(self._coil.address)
+        if coil is None:
+            return
+
+        self._coil = coil
+        self._async_read_coil(coil)
+        self.async_write_ha_state()
diff --git a/homeassistant/components/nibe_heatpump/config_flow.py b/homeassistant/components/nibe_heatpump/config_flow.py
new file mode 100644
index 00000000000..14da4d478b2
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/config_flow.py
@@ -0,0 +1,133 @@
+"""Config flow for Nibe Heat Pump integration."""
+from __future__ import annotations
+
+import errno
+from typing import Any
+
+from nibe.connection.nibegw import NibeGW
+from nibe.exceptions import CoilNotFoundException, CoilReadException, CoilWriteException
+from nibe.heatpump import HeatPump, Model
+import voluptuous as vol
+
+from homeassistant import config_entries
+from homeassistant.const import CONF_IP_ADDRESS, CONF_MODEL
+from homeassistant.core import HomeAssistant
+from homeassistant.data_entry_flow import FlowResult
+from homeassistant.helpers import config_validation as cv
+from homeassistant.util.network import is_ipv4_address
+
+from .const import (
+    CONF_CONNECTION_TYPE,
+    CONF_CONNECTION_TYPE_NIBEGW,
+    CONF_LISTENING_PORT,
+    CONF_REMOTE_READ_PORT,
+    CONF_REMOTE_WRITE_PORT,
+    CONF_WORD_SWAP,
+    DOMAIN,
+    LOGGER,
+)
+
+STEP_USER_DATA_SCHEMA = vol.Schema(
+    {
+        vol.Required(CONF_MODEL): vol.In([e.name for e in Model]),
+        vol.Required(CONF_IP_ADDRESS): str,
+        vol.Required(CONF_LISTENING_PORT): cv.port,
+        vol.Required(CONF_REMOTE_READ_PORT): cv.port,
+        vol.Required(CONF_REMOTE_WRITE_PORT): cv.port,
+    }
+)
+
+
+class FieldError(Exception):
+    """Field with invalid data."""
+
+    def __init__(self, message: str, field: str, error: str) -> None:
+        """Set up error."""
+        super().__init__(message)
+        self.field = field
+        self.error = error
+
+
+async def validate_input(hass: HomeAssistant, data: dict[str, Any]) -> dict[str, Any]:
+    """Validate the user input allows us to connect."""
+
+    if not is_ipv4_address(data[CONF_IP_ADDRESS]):
+        raise FieldError("Not a valid ipv4 address", CONF_IP_ADDRESS, "address")
+
+    heatpump = HeatPump(Model[data[CONF_MODEL]])
+    heatpump.initialize()
+
+    connection = NibeGW(
+        heatpump,
+        data[CONF_IP_ADDRESS],
+        data[CONF_REMOTE_READ_PORT],
+        data[CONF_REMOTE_WRITE_PORT],
+        listening_port=data[CONF_LISTENING_PORT],
+    )
+
+    try:
+        await connection.start()
+    except OSError as exception:
+        if exception.errno == errno.EADDRINUSE:
+            raise FieldError(
+                "Address already in use", "listening_port", "address_in_use"
+            ) from exception
+        raise
+
+    try:
+        coil = heatpump.get_coil_by_name("modbus40-word-swap-48852")
+        coil = await connection.read_coil(coil)
+        word_swap = coil.value == "ON"
+        coil = await connection.write_coil(coil)
+    except CoilNotFoundException as exception:
+        raise FieldError(
+            "Model selected doesn't seem to support expected coils", "base", "model"
+        ) from exception
+    except CoilReadException as exception:
+        raise FieldError("Timeout on read from pump", "base", "read") from exception
+    except CoilWriteException as exception:
+        raise FieldError("Timeout on writing to pump", "base", "write") from exception
+    finally:
+        await connection.stop()
+
+    return {
+        "title": f"{data[CONF_MODEL]} at {data[CONF_IP_ADDRESS]}",
+        CONF_WORD_SWAP: word_swap,
+    }
+
+
+class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
+    """Handle a config flow for Nibe Heat Pump."""
+
+    VERSION = 1
+
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
+        """Handle the initial step."""
+        if user_input is None:
+            return self.async_show_form(
+                step_id="user", data_schema=STEP_USER_DATA_SCHEMA
+            )
+
+        errors = {}
+
+        try:
+            info = await validate_input(self.hass, user_input)
+        except FieldError as exception:
+            LOGGER.exception("Validation error")
+            errors[exception.field] = exception.error
+        except Exception:  # pylint: disable=broad-except
+            LOGGER.exception("Unexpected exception")
+            errors["base"] = "unknown"
+        else:
+            data = {
+                **user_input,
+                CONF_WORD_SWAP: info[CONF_WORD_SWAP],
+                CONF_CONNECTION_TYPE: CONF_CONNECTION_TYPE_NIBEGW,
+            }
+            return self.async_create_entry(title=info["title"], data=data)
+
+        return self.async_show_form(
+            step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors
+        )
diff --git a/homeassistant/components/nibe_heatpump/const.py b/homeassistant/components/nibe_heatpump/const.py
new file mode 100644
index 00000000000..f1bcbf11127
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/const.py
@@ -0,0 +1,12 @@
+"""Constants for the Nibe Heat Pump integration."""
+import logging
+
+DOMAIN = "nibe_heatpump"
+LOGGER = logging.getLogger(__package__)
+
+CONF_LISTENING_PORT = "listening_port"
+CONF_REMOTE_READ_PORT = "remote_read_port"
+CONF_REMOTE_WRITE_PORT = "remote_write_port"
+CONF_WORD_SWAP = "word_swap"
+CONF_CONNECTION_TYPE = "connection_type"
+CONF_CONNECTION_TYPE_NIBEGW = "nibegw"
diff --git a/homeassistant/components/nibe_heatpump/manifest.json b/homeassistant/components/nibe_heatpump/manifest.json
new file mode 100644
index 00000000000..4b66b93d31b
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/manifest.json
@@ -0,0 +1,9 @@
+{
+  "domain": "nibe_heatpump",
+  "name": "Nibe Heat Pump",
+  "config_flow": true,
+  "documentation": "https://www.home-assistant.io/integrations/nibe_heatpump",
+  "requirements": ["nibe==0.5.0", "tenacity==8.0.1"],
+  "codeowners": ["@elupus"],
+  "iot_class": "local_polling"
+}
diff --git a/homeassistant/components/nibe_heatpump/sensor.py b/homeassistant/components/nibe_heatpump/sensor.py
new file mode 100644
index 00000000000..b6ea2e766a2
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/sensor.py
@@ -0,0 +1,77 @@
+"""The Nibe Heat Pump sensors."""
+from __future__ import annotations
+
+from nibe.coil import Coil
+
+from homeassistant.components.sensor import (
+    ENTITY_ID_FORMAT,
+    SensorDeviceClass,
+    SensorEntity,
+    SensorStateClass,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import (
+    ELECTRIC_CURRENT_AMPERE,
+    ELECTRIC_CURRENT_MILLIAMPERE,
+    ELECTRIC_POTENTIAL_MILLIVOLT,
+    ELECTRIC_POTENTIAL_VOLT,
+    ENERGY_KILO_WATT_HOUR,
+    ENERGY_MEGA_WATT_HOUR,
+    ENERGY_WATT_HOUR,
+    TEMP_CELSIUS,
+    TEMP_FAHRENHEIT,
+    TEMP_KELVIN,
+    TIME_HOURS,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import EntityCategory
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from . import DOMAIN, CoilEntity, Coordinator
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up platform."""
+
+    coordinator: Coordinator = hass.data[DOMAIN][config_entry.entry_id]
+
+    async_add_entities(
+        Sensor(coordinator, coil)
+        for coil in coordinator.coils
+        if not coil.is_writable and not coil.is_boolean
+    )
+
+
+class Sensor(SensorEntity, CoilEntity):
+    """Sensor entity."""
+
+    _attr_entity_category = EntityCategory.DIAGNOSTIC
+
+    def __init__(self, coordinator: Coordinator, coil: Coil) -> None:
+        """Initialize entity."""
+        super().__init__(coordinator, coil, ENTITY_ID_FORMAT)
+        self._attr_native_unit_of_measurement = coil.unit
+
+        unit = self.native_unit_of_measurement
+        if unit in {TEMP_CELSIUS, TEMP_FAHRENHEIT, TEMP_KELVIN}:
+            self._attr_device_class = SensorDeviceClass.TEMPERATURE
+        elif unit in {ELECTRIC_CURRENT_AMPERE, ELECTRIC_CURRENT_MILLIAMPERE}:
+            self._attr_device_class = SensorDeviceClass.CURRENT
+        elif unit in {ELECTRIC_POTENTIAL_VOLT, ELECTRIC_POTENTIAL_MILLIVOLT}:
+            self._attr_device_class = SensorDeviceClass.VOLTAGE
+        elif unit in {ENERGY_WATT_HOUR, ENERGY_KILO_WATT_HOUR, ENERGY_MEGA_WATT_HOUR}:
+            self._attr_device_class = SensorDeviceClass.ENERGY
+        elif unit in {TIME_HOURS}:
+            self._attr_device_class = SensorDeviceClass.DURATION
+        else:
+            self._attr_device_class = None
+
+        if unit:
+            self._attr_state_class = SensorStateClass.MEASUREMENT
+
+    def _async_read_coil(self, coil: Coil):
+        self._attr_native_value = coil.value
diff --git a/homeassistant/components/nibe_heatpump/strings.json b/homeassistant/components/nibe_heatpump/strings.json
new file mode 100644
index 00000000000..5b31ba178b3
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/strings.json
@@ -0,0 +1,25 @@
+{
+  "config": {
+    "step": {
+      "user": {
+        "data": {
+          "ip_address": "Remote IP address",
+          "remote_read_port": "Remote read port",
+          "remote_write_port": "Remote write port",
+          "listening_port": "Local listening port"
+        }
+      }
+    },
+    "error": {
+      "write": "Error on write request to pump. Verify your `Remote write port` or `Remote IP address`.",
+      "read": "Error on read request from pump. Verify your `Remote read port` or `Remote IP address`.",
+      "address": "Invalid remote IP address specified. Address must be a IPV4 address.",
+      "address_in_use": "The selected listening port is already in use on this system.",
+      "model": "The model selected doesn't seem to support modbus40",
+      "unknown": "[%key:common::config_flow::error::unknown%]"
+    },
+    "abort": {
+      "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"
+    }
+  }
+}
diff --git a/homeassistant/components/nibe_heatpump/translations/en.json b/homeassistant/components/nibe_heatpump/translations/en.json
new file mode 100644
index 00000000000..17120e20d88
--- /dev/null
+++ b/homeassistant/components/nibe_heatpump/translations/en.json
@@ -0,0 +1,24 @@
+{
+    "config": {
+        "abort": {
+            "already_configured": "Device is already configured"
+        },
+        "error": {
+            "address": "Invalid remote IP address specified. Address must be a IPV4 address.",
+            "address_in_use": "The selected listening port is already in use on this system. Reconfigure your gateway device to use a different address if the conflict can not be resolved.",
+            "read": "Error on read request from pump. Verify your `Remote read port` or `Remote IP address`.",
+            "unknown": "Unexpected error",
+            "write": "Error on write request to pump. Verify your `Remote write port` or `Remote IP address`."
+        },
+        "step": {
+            "user": {
+                "data": {
+                    "ip_address": "Remote IP address",
+                    "listening_port": "Local listening port",
+                    "remote_read_port": "Remote read port",
+                    "remote_write_port": "Remote write port"
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/homeassistant/generated/config_flows.py b/homeassistant/generated/config_flows.py
index a66e426c883..b375cb4a340 100644
--- a/homeassistant/generated/config_flows.py
+++ b/homeassistant/generated/config_flows.py
@@ -254,6 +254,7 @@ FLOWS = {
         "nexia",
         "nextdns",
         "nfandroidtv",
+        "nibe_heatpump",
         "nightscout",
         "nina",
         "nmap_tracker",
diff --git a/requirements_all.txt b/requirements_all.txt
index 218718ace49..5f9b0c30780 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1142,6 +1142,9 @@ nextcord==2.0.0a8
 # homeassistant.components.nextdns
 nextdns==1.1.1
 
+# homeassistant.components.nibe_heatpump
+nibe==0.5.0
+
 # homeassistant.components.niko_home_control
 niko-home-control==0.2.1
 
@@ -2369,6 +2372,9 @@ temescal==0.5
 # homeassistant.components.temper
 temperusb==1.5.3
 
+# homeassistant.components.nibe_heatpump
+tenacity==8.0.1
+
 # homeassistant.components.tensorflow
 # tensorflow==2.5.0
 
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 255c208ccaf..073c3ebd95f 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -823,6 +823,9 @@ nextcord==2.0.0a8
 # homeassistant.components.nextdns
 nextdns==1.1.1
 
+# homeassistant.components.nibe_heatpump
+nibe==0.5.0
+
 # homeassistant.components.nfandroidtv
 notifications-android-tv==0.1.5
 
@@ -1621,6 +1624,9 @@ tellduslive==0.10.11
 # homeassistant.components.lg_soundbar
 temescal==0.5
 
+# homeassistant.components.nibe_heatpump
+tenacity==8.0.1
+
 # homeassistant.components.powerwall
 tesla-powerwall==0.3.18
 
diff --git a/tests/components/nibe_heatpump/__init__.py b/tests/components/nibe_heatpump/__init__.py
new file mode 100644
index 00000000000..2f440d208e7
--- /dev/null
+++ b/tests/components/nibe_heatpump/__init__.py
@@ -0,0 +1 @@
+"""Tests for the Nibe Heat Pump integration."""
diff --git a/tests/components/nibe_heatpump/test_config_flow.py b/tests/components/nibe_heatpump/test_config_flow.py
new file mode 100644
index 00000000000..68c01bf91c8
--- /dev/null
+++ b/tests/components/nibe_heatpump/test_config_flow.py
@@ -0,0 +1,172 @@
+"""Test the Nibe Heat Pump config flow."""
+import errno
+from unittest.mock import Mock, patch
+
+from nibe.coil import Coil
+from nibe.connection import Connection
+from nibe.exceptions import CoilNotFoundException, CoilReadException, CoilWriteException
+from pytest import fixture
+
+from homeassistant import config_entries
+from homeassistant.components.nibe_heatpump import DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.data_entry_flow import FlowResultType
+
+MOCK_FLOW_USERDATA = {
+    "model": "F1155",
+    "ip_address": "127.0.0.1",
+    "listening_port": 9999,
+    "remote_read_port": 10000,
+    "remote_write_port": 10001,
+}
+
+
+@fixture(autouse=True, name="mock_connection")
+async def fixture_mock_connection():
+    """Make sure we have a dummy connection."""
+    with patch(
+        "homeassistant.components.nibe_heatpump.config_flow.NibeGW", spec=Connection
+    ) as mock_connection:
+        yield mock_connection
+
+
+@fixture(autouse=True, name="mock_setup_entry")
+async def fixture_mock_setup():
+    """Make sure we never actually run setup."""
+    with patch(
+        "homeassistant.components.nibe_heatpump.async_setup_entry", return_value=True
+    ) as mock_setup_entry:
+        yield mock_setup_entry
+
+
+async def test_form(
+    hass: HomeAssistant, mock_connection: Mock, mock_setup_entry: Mock
+) -> None:
+    """Test we get the form."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+    assert result["type"] == FlowResultType.FORM
+    assert result["errors"] is None
+
+    coil_wordswap = Coil(
+        48852, "modbus40-word-swap-48852", "Modbus40 Word Swap", "u8", min=0, max=1
+    )
+    coil_wordswap.value = "ON"
+    mock_connection.return_value.read_coil.return_value = coil_wordswap
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], MOCK_FLOW_USERDATA
+    )
+    await hass.async_block_till_done()
+
+    assert result2["type"] == FlowResultType.CREATE_ENTRY
+    assert result2["title"] == "F1155 at 127.0.0.1"
+    assert result2["data"] == {
+        "model": "F1155",
+        "ip_address": "127.0.0.1",
+        "listening_port": 9999,
+        "remote_read_port": 10000,
+        "remote_write_port": 10001,
+        "word_swap": True,
+        "connection_type": "nibegw",
+    }
+    assert len(mock_setup_entry.mock_calls) == 1
+
+
+async def test_address_inuse(hass: HomeAssistant, mock_connection: Mock) -> None:
+    """Test we handle invalid auth."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    error = OSError()
+    error.errno = errno.EADDRINUSE
+    mock_connection.return_value.start.side_effect = error
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], MOCK_FLOW_USERDATA
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"listening_port": "address_in_use"}
+
+
+async def test_read_timeout(hass: HomeAssistant, mock_connection: Mock) -> None:
+    """Test we handle cannot connect error."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    mock_connection.return_value.read_coil.side_effect = CoilReadException()
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], MOCK_FLOW_USERDATA
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"base": "read"}
+
+
+async def test_write_timeout(hass: HomeAssistant, mock_connection: Mock) -> None:
+    """Test we handle cannot connect error."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    mock_connection.return_value.write_coil.side_effect = CoilWriteException()
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], MOCK_FLOW_USERDATA
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"base": "write"}
+
+
+async def test_unexpected_exception(hass: HomeAssistant, mock_connection: Mock) -> None:
+    """Test we handle cannot connect error."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    mock_connection.return_value.read_coil.side_effect = Exception()
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], MOCK_FLOW_USERDATA
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"base": "unknown"}
+
+
+async def test_invalid_ip(hass: HomeAssistant, mock_connection: Mock) -> None:
+    """Test we handle cannot connect error."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    mock_connection.return_value.read_coil.side_effect = Exception()
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], {**MOCK_FLOW_USERDATA, "ip_address": "abcd"}
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"ip_address": "address"}
+
+
+async def test_model_missing_coil(hass: HomeAssistant, mock_connection: Mock) -> None:
+    """Test we handle cannot connect error."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    mock_connection.return_value.read_coil.side_effect = CoilNotFoundException()
+
+    result2 = await hass.config_entries.flow.async_configure(
+        result["flow_id"], {**MOCK_FLOW_USERDATA}
+    )
+
+    assert result2["type"] == FlowResultType.FORM
+    assert result2["errors"] == {"base": "model"}