diff --git a/tests/domain/modelling/test_heating_recommendation.py b/tests/domain/modelling/test_heating_recommendation.py
index bb54792ca..5a54ff812 100644
--- a/tests/domain/modelling/test_heating_recommendation.py
+++ b/tests/domain/modelling/test_heating_recommendation.py
@@ -336,6 +336,22 @@ def test_existing_heat_pump_yields_no_ashp_bundle() -> None:
         }
 
 
+def test_community_heated_house_yields_no_ashp_bundle() -> None:
+    # Arrange — community boiler network (SAP code 301, category 6) on a house:
+    # topology alone must block ASHP regardless of fuel.
+    epc = build_epc()
+    main = epc.sap_heating.main_heating_details[0]
+    main.sap_main_heating_code = 301
+    main.main_heating_category = 6
+
+    # Act / Assert
+    recommendation: Recommendation | None = recommend_heating(epc, _StubProducts())
+    if recommendation is not None:
+        assert MeasureType.AIR_SOURCE_HEAT_PUMP not in {
+            o.measure_type for o in recommendation.options
+        }
+
+
 # --- Gas boiler upgrade (Heating/HW expansion) ----------------------------