diff --git a/homeassistant/components/rehlko/__init__.py b/homeassistant/components/rehlko/__init__.py
index 49ceb8ac870..bda2704a206 100644
--- a/homeassistant/components/rehlko/__init__.py
+++ b/homeassistant/components/rehlko/__init__.py
@@ -29,6 +29,8 @@ async def async_setup_entry(hass: HomeAssistant, entry: RehlkoConfigEntry) -> bo
     """Set up Rehlko from a config entry."""
     websession = async_get_clientsession(hass)
     rehlko = AioKem(session=websession)
+    # If requests take more than 20 seconds; timeout and let the setup retry.
+    rehlko.set_timeout(20)
 
     async def async_refresh_token_update(refresh_token: str) -> None:
         """Handle refresh token update."""
@@ -87,6 +89,8 @@ async def async_setup_entry(hass: HomeAssistant, entry: RehlkoConfigEntry) -> bo
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
     # Retrys enabled after successful connection to prevent blocking startup
     rehlko.set_retry_policy(retry_count=3, retry_delays=[5, 10, 20])
+    # Rehlko service can be slow to respond, increase timeout for polls.
+    rehlko.set_timeout(100)
     return True