diff --git a/ontology/yaml/resources/HVAC/entity_types/BLR.yaml b/ontology/yaml/resources/HVAC/entity_types/BLR.yaml
index debf973aea..b56cc9d43e 100644
--- a/ontology/yaml/resources/HVAC/entity_types/BLR.yaml
+++ b/ontology/yaml/resources/HVAC/entity_types/BLR.yaml
@@ -283,6 +283,7 @@ BLR_SS_RWTC_HTRWC:
   - HTRWC
 
 BLR_HT2SWC_RWTM:
+  guid: "b6122561-7076-49e7-8e80-156d88d70916"
   description: "Two-stage boiler with supply control, return temperature monitoring."
   is_canonical: true
   implements: