diff --git a/recipes.json b/recipes.json
index 21726a6..75bd4e0 100644
--- a/recipes.json
+++ b/recipes.json
@@ -5,7 +5,7 @@
     "controllers": [
       "(make-duty-controller \"humidifier\" 0.6 100 '<)",
       "(make-duty-controller \"freezer\" 0.4 100 '>)",
-      "(make-duty-controller \"heater\" 1.0 100 '>)"
+      "(make-duty-controller \"heater\" 1.0 100 '<)"
     ],
     "phases": [
       {