diff --git a/binary_sensor.py b/binary_sensor.py
index 3c4896a..b583d8b 100644
--- a/binary_sensor.py
+++ b/binary_sensor.py
@@ -9,7 +9,7 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
 from . import ModbusRTUMonitorConfigEntry
-from .const import COIL_COUNT, DOMAIN, MANUFACTURER, MODEL
+from .const import COIL_COUNT, DOMAIN, HEATING_STATUS_REGISTER, MANUFACTURER, MODEL
 from .coordinator import ModbusRTUMonitorCoordinator
 
 
@@ -22,24 +22,27 @@ async def async_setup_entry(
     coordinator = entry.runtime_data
 
     # Track which slaves have binary sensor entities
-    added_slaves: set[int] = set()
+    added_slaves_coils: set[int] = set()
+    added_slaves_zone_pump: set[int] = set()
 
     @callback
     def _async_add_binary_sensor_entities() -> None:
-        """Add binary sensor entities for newly discovered slaves with coil data."""
+        """Add binary sensor entities for newly discovered slaves."""
         if coordinator.data is None:
             return
 
-        current_slaves = {
+        entities = []
+
+        # Add coil binary sensors for slaves with coil data
+        current_slaves_coils = {
             slave_id
             for slave_id, slave_data in coordinator.data.items()
             if slave_data.coils is not None
         }
-        new_slaves = current_slaves - added_slaves
+        new_slaves_coils = current_slaves_coils - added_slaves_coils
 
-        if new_slaves:
-            entities = []
-            for slave_id in new_slaves:
+        if new_slaves_coils:
+            for slave_id in new_slaves_coils:
                 # Create 40 binary sensors (coil1-40) for each slave
                 for coil_idx in range(COIL_COUNT):
                     entities.append(
@@ -47,8 +50,26 @@ async def async_setup_entry(
                             coordinator, slave_id, coil_idx + 1
                         )
                     )
+            added_slaves_coils.update(new_slaves_coils)
+
+        # Add zone pump binary sensor for slaves with register data
+        current_slaves_zone_pump = {
+            slave_id
+            for slave_id, slave_data in coordinator.data.items()
+            if slave_data.registers is not None
+            and HEATING_STATUS_REGISTER in slave_data.registers
+        }
+        new_slaves_zone_pump = current_slaves_zone_pump - added_slaves_zone_pump
+
+        if new_slaves_zone_pump:
+            for slave_id in new_slaves_zone_pump:
+                entities.append(
+                    ModbusRTUMonitorZonePumpSensor(coordinator, slave_id)
+                )
+            added_slaves_zone_pump.update(new_slaves_zone_pump)
+
+        if entities:
             async_add_entities(entities)
-            added_slaves.update(new_slaves)
 
     # Subscribe to coordinator updates
     entry.async_on_unload(
@@ -116,4 +137,66 @@ class ModbusRTUMonitorCoilSensor(
     @property
     def extra_state_attributes(self) -> dict[str, int]:
         """Return additional state attributes."""
-        return {"coil_number": self._coil_number}
\ No newline at end of file
+        return {"coil_number": self._coil_number}
+
+
+class ModbusRTUMonitorZonePumpSensor(
+    CoordinatorEntity[ModbusRTUMonitorCoordinator], BinarySensorEntity
+):
+    """Binary sensor entity for zone pump status."""
+
+    _attr_has_entity_name = True
+    _attr_name = "Zone pump"  # User-friendly name
+
+    def __init__(
+        self,
+        coordinator: ModbusRTUMonitorCoordinator,
+        slave_id: int,
+    ) -> None:
+        """Initialize zone pump binary sensor."""
+        super().__init__(coordinator)
+
+        self._slave_id = slave_id
+
+        self._attr_unique_id = (
+            f"{coordinator.config_entry.entry_id}_{slave_id}_zone_pump"
+        )
+
+        # Device info (groups with climate and humidity sensor)
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, f"{coordinator.config_entry.entry_id}_{slave_id}")},
+            name=f"Modbus Slave {slave_id}",
+            manufacturer=MANUFACTURER,
+            model=MODEL,
+        )
+
+    @property
+    def available(self) -> bool:
+        """Return if entity is available."""
+        if self._slave_id not in self.coordinator.data:
+            return False
+        slave_data = self.coordinator.data[self._slave_id]
+        if not slave_data.available or slave_data.registers is None:
+            return False
+        return HEATING_STATUS_REGISTER in slave_data.registers
+
+    @property
+    def is_on(self) -> bool | None:
+        """Return true if the zone pump is on (register value = 1)."""
+        if self._slave_id not in self.coordinator.data:
+            return None
+        slave_data = self.coordinator.data[self._slave_id]
+        if slave_data.registers is None:
+            return None
+
+        zone_pump_value = slave_data.registers.get(HEATING_STATUS_REGISTER)
+        if zone_pump_value is None:
+            return None
+
+        # ON if register value is 1, OFF otherwise
+        return zone_pump_value == 1
+
+    @property
+    def extra_state_attributes(self) -> dict[str, int]:
+        """Return additional state attributes."""
+        return {"register_address": HEATING_STATUS_REGISTER}
\ No newline at end of file
diff --git a/const.py b/const.py
index efe1bbc..0d78da4 100644
--- a/const.py
+++ b/const.py
@@ -31,7 +31,7 @@ REGISTER_NAMES: dict[int, str] = {
     156: "Day of week",
     157: "Current temperature",
     179: "Outside temperature",
-    211: "Heating status",
+    211: "Zone pump",
     # Add more registers as discovered
     # Example:
     # 165: "Register name",
diff --git a/hub.py b/hub.py
index 6f1d21a..9b6466f 100644
--- a/hub.py
+++ b/hub.py
@@ -226,8 +226,8 @@ class ModbusRTUMonitorHub:
             self._writer.close()
             await self._writer.wait_closed()
 
-        # Wait before reconnecting
-        await asyncio.sleep(5)
+        # Wait before reconnecting (30 seconds to prevent DDOS during server outages)
+        await asyncio.sleep(30)
 
         # Attempt reconnection
         try:
diff --git a/sensor.py b/sensor.py
index af7a356..3ccd17e 100644
--- a/sensor.py
+++ b/sensor.py
@@ -16,6 +16,7 @@ from homeassistant.helpers.update_coordinator import CoordinatorEntity
 from . import ModbusRTUMonitorConfigEntry
 from .const import (
     DOMAIN,
+    HEATING_STATUS_REGISTER,
     MANUFACTURER,
     MODEL,
     REGISTER_MONITOR_COUNT,