diff --git a/.coveragerc b/.coveragerc
index e7fa4020f34..9745a0708c8 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1242,6 +1242,7 @@ omit =
     homeassistant/components/vallox/const.py
     homeassistant/components/vallox/fan.py
     homeassistant/components/vallox/sensor.py
+    homeassistant/components/vallox/binary_sensor.py
     homeassistant/components/vasttrafik/sensor.py
     homeassistant/components/velbus/__init__.py
     homeassistant/components/velbus/binary_sensor.py
diff --git a/CODEOWNERS b/CODEOWNERS
index 9d88b498845..065597da388 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -1006,8 +1006,8 @@ homeassistant/components/usgs_earthquakes_feed/* @exxamalte
 tests/components/usgs_earthquakes_feed/* @exxamalte
 homeassistant/components/utility_meter/* @dgomes
 tests/components/utility_meter/* @dgomes
-homeassistant/components/vallox/* @andre-richter @slovdahl
-tests/components/vallox/* @andre-richter @slovdahl
+homeassistant/components/vallox/* @andre-richter @slovdahl @viiru-
+tests/components/vallox/* @andre-richter @slovdahl @viiru-
 homeassistant/components/velbus/* @Cereal2nd @brefra
 tests/components/velbus/* @Cereal2nd @brefra
 homeassistant/components/velux/* @Julius2342
diff --git a/homeassistant/components/vallox/__init__.py b/homeassistant/components/vallox/__init__.py
index 153fd7146b2..8a23f7d8df9 100644
--- a/homeassistant/components/vallox/__init__.py
+++ b/homeassistant/components/vallox/__init__.py
@@ -52,6 +52,7 @@ CONFIG_SCHEMA = vol.Schema(
 PLATFORMS: list[str] = [
     Platform.SENSOR,
     Platform.FAN,
+    Platform.BINARY_SENSOR,
 ]
 
 ATTR_PROFILE = "profile"
diff --git a/homeassistant/components/vallox/binary_sensor.py b/homeassistant/components/vallox/binary_sensor.py
new file mode 100644
index 00000000000..e7b25ca2a80
--- /dev/null
+++ b/homeassistant/components/vallox/binary_sensor.py
@@ -0,0 +1,85 @@
+"""Support for Vallox ventilation unit binary sensors."""
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorEntity,
+    BinarySensorEntityDescription,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from . import ValloxDataUpdateCoordinator
+from .const import DOMAIN
+
+
+class ValloxBinarySensor(CoordinatorEntity, BinarySensorEntity):
+    """Representation of a Vallox binary sensor."""
+
+    entity_description: ValloxBinarySensorEntityDescription
+    coordinator: ValloxDataUpdateCoordinator
+
+    def __init__(
+        self,
+        name: str,
+        coordinator: ValloxDataUpdateCoordinator,
+        description: ValloxBinarySensorEntityDescription,
+    ) -> None:
+        """Initialize the Vallox binary sensor."""
+        super().__init__(coordinator)
+
+        self.entity_description = description
+
+        self._attr_name = f"{name} {description.name}"
+
+        uuid = self.coordinator.data.get_uuid()
+        self._attr_unique_id = f"{uuid}-{description.key}"
+
+    @property
+    def is_on(self) -> bool | None:
+        """Return true if the binary sensor is on."""
+        return self.coordinator.data.get_metric(self.entity_description.metric_key) == 1
+
+
+@dataclass
+class ValloxMetricKeyMixin:
+    """Dataclass to allow defining metric_key without a default value."""
+
+    metric_key: str
+
+
+@dataclass
+class ValloxBinarySensorEntityDescription(
+    BinarySensorEntityDescription, ValloxMetricKeyMixin
+):
+    """Describes Vallox binary sensor entity."""
+
+
+SENSORS: tuple[ValloxBinarySensorEntityDescription, ...] = (
+    ValloxBinarySensorEntityDescription(
+        key="post_heater",
+        name="Post Heater",
+        icon="mdi:radiator",
+        metric_key="A_CYC_IO_HEATER",
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up the sensors."""
+
+    data = hass.data[DOMAIN][entry.entry_id]
+
+    async_add_entities(
+        [
+            ValloxBinarySensor(data["name"], data["coordinator"], description)
+            for description in SENSORS
+        ]
+    )
diff --git a/homeassistant/components/vallox/manifest.json b/homeassistant/components/vallox/manifest.json
index bd857250522..4fb0bd29ac5 100644
--- a/homeassistant/components/vallox/manifest.json
+++ b/homeassistant/components/vallox/manifest.json
@@ -3,7 +3,7 @@
   "name": "Vallox",
   "documentation": "https://www.home-assistant.io/integrations/vallox",
   "requirements": ["vallox-websocket-api==2.9.0"],
-  "codeowners": ["@andre-richter", "@slovdahl"],
+  "codeowners": ["@andre-richter", "@slovdahl", "@viiru-"],
   "config_flow": true,
   "iot_class": "local_polling"
 }