diff --git a/bundles/org.openhab.binding.max/src/main/resources/ESH-INF/thing/thing-types.xml b/bundles/org.openhab.binding.max/src/main/resources/ESH-INF/thing/thing-types.xml
index 6e1ae1437baa6..336747f15adc5 100644
--- a/bundles/org.openhab.binding.max/src/main/resources/ESH-INF/thing/thing-types.xml
+++ b/bundles/org.openhab.binding.max/src/main/resources/ESH-INF/thing/thing-types.xml
@@ -471,7 +471,7 @@
 		<tags>
 			<tag>heating</tag>
 		</tags>
-		<state pattern="%.1f %unit%"/>
+		<state min="4.5" max="30.5" step="0.5" pattern="%.1f %unit%"/>
 	</channel-type>
 
 	<channel-type id="locked" advanced="true">