diff --git a/homeassistant/components/toon/const.py b/homeassistant/components/toon/const.py
index 762374eb41c..29b58fbfff9 100644
--- a/homeassistant/components/toon/const.py
+++ b/homeassistant/components/toon/const.py
@@ -14,7 +14,7 @@ DEFAULT_MAX_TEMP = 30.0
 DEFAULT_MIN_TEMP = 6.0
 
 CURRENCY_EUR = 'EUR'
-POWER_WATT = 'Watt'
+POWER_WATT = 'W'
 POWER_KWH = 'kWh'
 RATIO_PERCENT = '%'
 VOLUME_CM3 = 'CM3'