diff --git a/interface/src/project/HeatingInformation.tsx b/interface/src/project/HeatingInformation.tsx
index 35ff0f4..bc088cf 100644
--- a/interface/src/project/HeatingInformation.tsx
+++ b/interface/src/project/HeatingInformation.tsx
@@ -42,7 +42,7 @@ class HeatingInformation extends React.Component<HeatingRestcontollerprops> {
                             <ListItem>
                                 <ListItemText
                                     primary="Gesammte Heizdauer / Prozentuelle Einschaltzeit"
-                                    secondary={stringifyTime(props.data.totalheattime) + ' / ' + props.data.heattimepercent * 100 + '%'}
+                                    secondary={stringifyTime(props.data.totalheattime) + ' / ' + (props.data.heattimepercent * 100).toFixed(2) + '%'}
                                 />
                             </ListItem>
                             <ListItem>