diff --git a/datatypes/epc/domain/tests/test_from_site_notes.py b/datatypes/epc/domain/tests/test_from_site_notes.py
index abc2742b..7b552773 100644
--- a/datatypes/epc/domain/tests/test_from_site_notes.py
+++ b/datatypes/epc/domain/tests/test_from_site_notes.py
@@ -603,3 +603,32 @@ class TestFromSiteNotesFloorConstruction:
     def test_floor_u_value_known(self, result: EpcPropertyData) -> None:
         # building_construction.floor.floor_u_value_known: false
         assert result.sap_building_parts[0].floor_u_value_known is False
+
+
+class TestFromSiteNotesHeatingBoiler:
+    """
+    Fixture: pashub_rdsap_site_notes_example1.json
+    Boiler: Vaillant ecoFIT sustain, condensing, no weather compensator, pump age unknown.
+    """
+
+    @pytest.fixture
+    def survey(self) -> PasHubRdSapSiteNotes:
+        return from_dict(
+            PasHubRdSapSiteNotes, load("pashub_rdsap_site_notes_example1.json")
+        )
+
+    @pytest.fixture
+    def result(self, survey: PasHubRdSapSiteNotes) -> EpcPropertyData:
+        return EpcPropertyDataMapper.from_site_notes(survey)
+
+    def test_condensing(self, result: EpcPropertyData) -> None:
+        # heating_and_hot_water.main_heating.condensing: true
+        assert result.sap_heating.main_heating_details[0].condensing is True
+
+    def test_weather_compensator(self, result: EpcPropertyData) -> None:
+        # heating_and_hot_water.main_heating.weather_compensator: false
+        assert result.sap_heating.main_heating_details[0].weather_compensator is False
+
+    def test_central_heating_pump_age_str(self, result: EpcPropertyData) -> None:
+        # heating_and_hot_water.main_heating.central_heating_pump_age: "Unknown"
+        assert result.sap_heating.main_heating_details[0].central_heating_pump_age_str == "Unknown"