diff --git a/tests/domain/epc/test_main_heating_system_overlay.py b/tests/domain/epc/test_main_heating_system_overlay.py
index 07171cfca..b42effd9b 100644
--- a/tests/domain/epc/test_main_heating_system_overlay.py
+++ b/tests/domain/epc/test_main_heating_system_overlay.py
@@ -457,6 +457,24 @@ def test_electric_boiler_overlays_the_boiler_category(
     assert simulation.heating.main_heating_category == 2
 
 
+@pytest.mark.parametrize(
+    "main_heating_value",
+    ["Direct-acting electric", "Electric boiler", "Electric CPSU"],
+)
+def test_complete_electric_boiler_overlay_does_not_log_a_companion_gap(
+    main_heating_value: str, caplog: pytest.LogCaptureFixture
+) -> None:
+    # Electric boilers now resolve a full companion set (category 2 + control
+    # 2101, ADR-0052), so the overlay must NOT log an incomplete-companion gap
+    # — guarding that the set stays complete.
+    # Act
+    with caplog.at_level(logging.ERROR):
+        main_heating_overlay_for(main_heating_value, 0)
+
+    # Assert
+    assert "incomplete companion set" not in caplog.text
+
+
 @pytest.mark.parametrize(
     "main_heating_value",
     ["Direct-acting electric", "Electric boiler", "Electric CPSU"],