diff --git a/homeassistant/components/iaqualink/config_flow.py b/homeassistant/components/iaqualink/config_flow.py
index 5b4ae9ffc0dc5..a8d2821b97268 100644
--- a/homeassistant/components/iaqualink/config_flow.py
+++ b/homeassistant/components/iaqualink/config_flow.py
@@ -13,9 +13,15 @@
 )
 import voluptuous as vol
 
-from homeassistant.config_entries import ConfigFlow, ConfigFlowResult
+from homeassistant.config_entries import (
+    SOURCE_DHCP,
+    SOURCE_REAUTH,
+    ConfigFlow,
+    ConfigFlowResult,
+)
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 from homeassistant.helpers.httpx_client import get_async_client
+from homeassistant.helpers.service_info.dhcp import DhcpServiceInfo
 from homeassistant.util.ssl import SSL_ALPN_HTTP11_HTTP2
 
 from .const import DOMAIN
@@ -33,6 +39,16 @@ class AqualinkFlowHandler(ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
+    def __init__(self) -> None:
+        """Initialize the config flow."""
+        self._discovered_hostname: str | None = None
+        self._discovered_ip: str | None = None
+
+    async def _async_set_single_instance_unique_id(self) -> None:
+        """Assign the unique ID used by this single-instance integration."""
+        await self.async_set_unique_id(DOMAIN, raise_on_progress=False)
+        self._abort_if_unique_id_configured(error="single_instance_allowed")
+
     async def _async_test_credentials(
         self, user_input: dict[str, Any]
     ) -> dict[str, str]:
@@ -53,10 +69,24 @@ async def _async_test_credentials(
 
         return {}
 
+    async def async_step_dhcp(
+        self, discovery_info: DhcpServiceInfo
+    ) -> ConfigFlowResult:
+        """Handle a DHCP discovery."""
+        await self._async_set_single_instance_unique_id()
+
+        self._discovered_hostname = discovery_info.hostname
+        self._discovered_ip = discovery_info.ip
+
+        return await self.async_step_user()
+
     async def async_step_user(
         self, user_input: dict[str, Any] | None = None
     ) -> ConfigFlowResult:
         """Handle a flow start."""
+        if self.source not in (SOURCE_DHCP, SOURCE_REAUTH):
+            await self._async_set_single_instance_unique_id()
+
         errors = {}
 
         if user_input is not None:
@@ -66,9 +96,21 @@ async def async_step_user(
                     title=user_input[CONF_USERNAME], data=user_input
                 )
 
+        discovery = ""
+        if (
+            self.source == SOURCE_DHCP
+            and self._discovered_hostname is not None
+            and self._discovered_ip is not None
+        ):
+            discovery = (
+                "A likely iAquaLink device was discovered on your network at "
+                f"{self._discovered_ip} ({self._discovered_hostname}). "
+            )
+
         return self.async_show_form(
             step_id="user",
             data_schema=CREDENTIALS_DATA_SCHEMA,
+            description_placeholders={"discovery": discovery},
             errors=errors,
         )
 
diff --git a/homeassistant/components/iaqualink/manifest.json b/homeassistant/components/iaqualink/manifest.json
index fea0531264ae9..8d1cc06303d2c 100644
--- a/homeassistant/components/iaqualink/manifest.json
+++ b/homeassistant/components/iaqualink/manifest.json
@@ -3,6 +3,7 @@
   "name": "Jandy iAqualink",
   "codeowners": ["@flz"],
   "config_flow": true,
+  "dhcp": [{ "hostname": "iaqualink-*" }],
   "documentation": "https://www.home-assistant.io/integrations/iaqualink",
   "integration_type": "hub",
   "iot_class": "cloud_polling",
diff --git a/homeassistant/components/iaqualink/strings.json b/homeassistant/components/iaqualink/strings.json
index a8629e4d6b36e..724a2096a04e6 100644
--- a/homeassistant/components/iaqualink/strings.json
+++ b/homeassistant/components/iaqualink/strings.json
@@ -21,7 +21,7 @@
           "password": "[%key:common::config_flow::data::password%]",
           "username": "[%key:common::config_flow::data::username%]"
         },
-        "description": "Please enter the username and password for your iAqualink account.",
+        "description": "{discovery}Please enter the username and password for your iAqualink account.",
         "title": "Connect to iAqualink"
       }
     }
diff --git a/homeassistant/generated/dhcp.py b/homeassistant/generated/dhcp.py
index 97625caa89bed..070027f65a924 100644
--- a/homeassistant/generated/dhcp.py
+++ b/homeassistant/generated/dhcp.py
@@ -325,6 +325,10 @@
         "hostname": "hunter*",
         "macaddress": "002674*",
     },
+    {
+        "domain": "iaqualink",
+        "hostname": "iaqualink-*",
+    },
     {
         "domain": "incomfort",
         "hostname": "rfgateway",
diff --git a/tests/components/iaqualink/test_config_flow.py b/tests/components/iaqualink/test_config_flow.py
index eca09f88171e5..97a3bff8bbe04 100644
--- a/tests/components/iaqualink/test_config_flow.py
+++ b/tests/components/iaqualink/test_config_flow.py
@@ -8,13 +8,20 @@
 )
 
 from homeassistant.components.iaqualink import DOMAIN, config_flow
-from homeassistant.config_entries import SOURCE_USER
+from homeassistant.config_entries import SOURCE_DHCP, SOURCE_USER
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
+from homeassistant.helpers.service_info.dhcp import DhcpServiceInfo
 
 from tests.common import MockConfigEntry
 
+DHCP_DISCOVERY = DhcpServiceInfo(
+    ip="192.168.1.23",
+    hostname="iAquaLink-123456",
+    macaddress="001122334455",
+)
+
 
 async def test_already_configured(
     hass: HomeAssistant,
@@ -45,12 +52,32 @@ async def test_without_config(hass: HomeAssistant) -> None:
     assert result["errors"] == {}
 
 
+async def test_dhcp_discovery_starts_user_flow(hass: HomeAssistant) -> None:
+    """Test DHCP discovery starts the user flow."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN,
+        context={"source": SOURCE_DHCP},
+        data=DHCP_DISCOVERY,
+    )
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+    assert result["errors"] == {}
+    assert result["description_placeholders"] == {
+        "discovery": (
+            "A likely iAquaLink device was discovered on your network at "
+            "192.168.1.23 (iAquaLink-123456). "
+        )
+    }
+
+
 async def test_with_invalid_credentials(
     hass: HomeAssistant, config_data: dict[str, str]
 ) -> None:
     """Test config flow with invalid username and/or password."""
     flow = config_flow.AqualinkFlowHandler()
     flow.hass = hass
+    flow.context = {}
 
     with patch(
         "homeassistant.components.iaqualink.config_flow.AqualinkClient.login",
@@ -69,6 +96,7 @@ async def test_service_exception(
     """Test config flow encountering service exception."""
     flow = config_flow.AqualinkFlowHandler()
     flow.hass = hass
+    flow.context = {}
 
     with patch(
         "homeassistant.components.iaqualink.config_flow.AqualinkClient.login",
@@ -100,6 +128,41 @@ async def test_with_existing_config(
     assert result["data"] == config_data
 
 
+async def test_user_flow_sets_domain_unique_id(
+    hass: HomeAssistant, config_data: dict[str, str]
+) -> None:
+    """Test the user flow stores the single-instance unique ID."""
+    flow = config_flow.AqualinkFlowHandler()
+    flow.hass = hass
+    flow.context = {}
+
+    with patch(
+        "homeassistant.components.iaqualink.config_flow.AqualinkClient.login",
+        return_value=None,
+    ):
+        result = await flow.async_step_user(config_data)
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["context"]["unique_id"] == DOMAIN
+
+
+async def test_dhcp_discovery_aborts_if_already_configured(
+    hass: HomeAssistant,
+    config_entry: MockConfigEntry,
+) -> None:
+    """Test DHCP discovery aborts if iaqualink is already configured."""
+    config_entry.add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN,
+        context={"source": SOURCE_DHCP},
+        data=DHCP_DISCOVERY,
+    )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "single_instance_allowed"
+
+
 async def test_reauth_success(hass: HomeAssistant, config_data: dict[str, str]) -> None:
     """Test successful reauthentication."""
     entry = MockConfigEntry(