diff --git a/_data/rules.yml b/_data/rules.yml
index e5d4f8f..c5aa279 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -220,6 +220,10 @@ services:
             description: 'The heap usage is over 90% for 5m - {{ $value | printf "%.2f"}}%'
             query: '(elasticsearch_jvm_memory_used_bytes{area="heap"} / elasticsearch_jvm_memory_max_bytes{area="heap"}) * 100 > 90'
             severity: critical
+          - name: Elastic Heap Usage warning
+            description: 'The heap usage is over 80% for 5m - {{ $value | printf "%.2f"}}%'
+            query: '(elasticsearch_jvm_memory_used_bytes{area="heap"} / elasticsearch_jvm_memory_max_bytes{area="heap"}) * 100 > 80'
+            severity: warning
           - name: Elastic Cluster RED
             description: Elastic Cluster RED status
             query: 'elasticsearch_cluster_health_status{color="red"} == 1'