diff --git a/homeassistant/components/route_b_smart_meter/coordinator.py b/homeassistant/components/route_b_smart_meter/coordinator.py
index 7cfa2810b5b..9ca9708791f 100644
--- a/homeassistant/components/route_b_smart_meter/coordinator.py
+++ b/homeassistant/components/route_b_smart_meter/coordinator.py
@@ -2,6 +2,7 @@
 
 from dataclasses import dataclass
 import logging
+import time
 
 from momonga import Momonga, MomongaError
 
@@ -28,9 +29,20 @@ class BRouteData:
 type BRouteConfigEntry = ConfigEntry[BRouteUpdateCoordinator]
 
 
+@dataclass
+class BRouteDeviceInfo:
+    """Static device information fetched once at setup."""
+
+    serial_number: str | None = None
+    manufacturer_code: str | None = None
+    echonet_version: str | None = None
+
+
 class BRouteUpdateCoordinator(DataUpdateCoordinator[BRouteData]):
     """The B Route update coordinator."""
 
+    device_info_data: BRouteDeviceInfo
+
     def __init__(
         self,
         hass: HomeAssistant,
@@ -40,9 +52,9 @@ class BRouteUpdateCoordinator(DataUpdateCoordinator[BRouteData]):
 
         self.device = entry.data[CONF_DEVICE]
         self.bid = entry.data[CONF_ID]
-        password = entry.data[CONF_PASSWORD]
+        self._password = entry.data[CONF_PASSWORD]
 
-        self.api = Momonga(dev=self.device, rbid=self.bid, pwd=password)
+        self.api = Momonga(dev=self.device, rbid=self.bid, pwd=self._password)
 
         super().__init__(
             hass,
@@ -52,10 +64,34 @@ class BRouteUpdateCoordinator(DataUpdateCoordinator[BRouteData]):
             update_interval=DEFAULT_SCAN_INTERVAL,
         )
 
+        self.device_info_data = BRouteDeviceInfo()
+
     async def _async_setup(self) -> None:
-        await self.hass.async_add_executor_job(
-            self.api.open,
-        )
+        def fetch() -> None:
+            self.api.open()
+            self._fetch_device_info()
+
+        await self.hass.async_add_executor_job(fetch)
+
+    def _fetch_device_info(self) -> None:
+        """Fetch static device information from the smart meter."""
+        try:
+            self.device_info_data.serial_number = self.api.get_serial_number()
+        except MomongaError:
+            _LOGGER.debug("Failed to fetch serial number", exc_info=True)
+
+        time.sleep(self.api.internal_xmit_interval)
+        try:
+            raw = self.api.get_manufacturer_code()
+            self.device_info_data.manufacturer_code = raw.hex().upper()
+        except MomongaError:
+            _LOGGER.debug("Failed to fetch manufacturer code", exc_info=True)
+
+        time.sleep(self.api.internal_xmit_interval)
+        try:
+            self.device_info_data.echonet_version = self.api.get_standard_version()
+        except MomongaError:
+            _LOGGER.debug("Failed to fetch ECHONET Lite version", exc_info=True)
 
     def _get_data(self) -> BRouteData:
         """Get the data from API."""
diff --git a/homeassistant/components/route_b_smart_meter/sensor.py b/homeassistant/components/route_b_smart_meter/sensor.py
index c8034528f5a..c85a633f29c 100644
--- a/homeassistant/components/route_b_smart_meter/sensor.py
+++ b/homeassistant/components/route_b_smart_meter/sensor.py
@@ -2,6 +2,7 @@
 
 from collections.abc import Callable
 from dataclasses import dataclass
+from typing import Literal
 
 from homeassistant.components.sensor import (
     SensorDeviceClass,
@@ -69,6 +70,27 @@ SENSOR_DESCRIPTIONS = (
     ),
 )
 
+_DEVICE_INFO_MAPPING: dict[
+    Literal["manufacturer", "serial_number", "sw_version"],
+    Callable[[BRouteUpdateCoordinator], str | None],
+] = {
+    "manufacturer": lambda coordinator: coordinator.device_info_data.manufacturer_code,
+    "serial_number": lambda coordinator: coordinator.device_info_data.serial_number,
+    "sw_version": lambda coordinator: coordinator.device_info_data.echonet_version,
+}
+
+
+def _build_device_info(coordinator: BRouteUpdateCoordinator) -> DeviceInfo:
+    """Build device information from coordinator data."""
+    device = DeviceInfo(
+        identifiers={(DOMAIN, coordinator.bid)},
+        name=f"Route B Smart Meter {coordinator.bid}",
+    )
+    for key, fn in _DEVICE_INFO_MAPPING.items():
+        if (value := fn(coordinator)) is not None:
+            device[key] = value
+    return device
+
 
 async def async_setup_entry(
     hass: HomeAssistant,
@@ -98,10 +120,7 @@ class SmartMeterBRouteSensor(CoordinatorEntity[BRouteUpdateCoordinator], SensorE
         super().__init__(coordinator)
         self.entity_description: SensorEntityDescriptionWithValueAccessor = description
         self._attr_unique_id = f"{coordinator.bid}_{description.key}"
-        self._attr_device_info = DeviceInfo(
-            identifiers={(DOMAIN, coordinator.bid)},
-            name=f"Route B Smart Meter {coordinator.bid}",
-        )
+        self._attr_device_info = _build_device_info(coordinator)
 
     @property
     def native_value(self) -> StateType:
diff --git a/tests/components/route_b_smart_meter/conftest.py b/tests/components/route_b_smart_meter/conftest.py
index f0a84c252a0..cbaad0f8388 100644
--- a/tests/components/route_b_smart_meter/conftest.py
+++ b/tests/components/route_b_smart_meter/conftest.py
@@ -44,6 +44,10 @@ def mock_momonga(exception=None) -> Generator[Mock]:
         }
         client.get_instantaneous_power.return_value = 3
         client.get_measured_cumulative_energy.return_value = 4
+        client.get_serial_number.return_value = "TEST_SERIAL"
+        client.get_manufacturer_code.return_value = b"\x00\x00\x16"
+        client.get_standard_version.return_value = "F.0"
+        client.internal_xmit_interval = 0
         yield mock_momonga