diff --git a/config/config.default.yaml b/config/config.default.yaml
index d7704a27..b9fb76f4 100644
--- a/config/config.default.yaml
+++ b/config/config.default.yaml
@@ -885,6 +885,7 @@ plotting:
     # heat demand
     Heat load: '#cc1f1f'
     heat: '#cc1f1f'
+    heat vent: '#aa3344'
     heat demand: '#cc1f1f'
     rural heat: '#ff5c5c'
     residential rural heat: '#ff7c7c'