diff --git a/homeassistant/components/vicare/climate.py b/homeassistant/components/vicare/climate.py
index 1b101cc7612..ef5533523f8 100644
--- a/homeassistant/components/vicare/climate.py
+++ b/homeassistant/components/vicare/climate.py
@@ -1,4 +1,5 @@
 """Viessmann ViCare climate device."""
+from datetime import timedelta
 import logging
 
 import requests
@@ -79,6 +80,9 @@ HA_TO_VICARE_PRESET_HEATING = {
 
 PYVICARE_ERROR = "error"
 
+# Scan interval of 15 minutes seems to be safe to not hit the ViCare server rate limit
+SCAN_INTERVAL = timedelta(seconds=900)
+
 
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Create the ViCare climate devices."""
diff --git a/homeassistant/components/vicare/water_heater.py b/homeassistant/components/vicare/water_heater.py
index eea3d81faf6..fdac2962739 100644
--- a/homeassistant/components/vicare/water_heater.py
+++ b/homeassistant/components/vicare/water_heater.py
@@ -1,4 +1,5 @@
 """Viessmann ViCare water_heater device."""
+from datetime import timedelta
 import logging
 
 import requests
@@ -42,6 +43,9 @@ HA_TO_VICARE_HVAC_DHW = {
 
 PYVICARE_ERROR = "error"
 
+# Scan interval of 15 minutes seems to be safe to not hit the ViCare server rate limit
+SCAN_INTERVAL = timedelta(seconds=900)
+
 
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Create the ViCare water_heater devices."""