diff --git a/backend/documents_parser/tests/test_extractor.py b/backend/documents_parser/tests/test_extractor.py
index 27214fd2..7e3c5160 100644
--- a/backend/documents_parser/tests/test_extractor.py
+++ b/backend/documents_parser/tests/test_extractor.py
@@ -402,6 +402,26 @@ class TestWaterHeatingCylinderThickness:
         assert hhw.water_heating.cylinder_size == "Normal (90-130 litres)"
 
 
+class TestSecondaryHeating:
+    @pytest.fixture
+    def hhw(self) -> HeatingAndHotWater:
+        return PasHubRdSapSiteNotesExtractor(
+            load_text_fixture_2()
+        ).extract_heating_and_hot_water()
+
+    @pytest.fixture
+    def hhw_no_secondary(self) -> HeatingAndHotWater:
+        return PasHubRdSapSiteNotesExtractor(
+            load_text_fixture()
+        ).extract_heating_and_hot_water()
+
+    def test_secondary_system(self, hhw: HeatingAndHotWater) -> None:
+        assert hhw.secondary_heating.secondary_system == "Open fire in grate"
+
+    def test_secondary_system_absent(self, hhw_no_secondary: HeatingAndHotWater) -> None:
+        assert hhw_no_secondary.secondary_heating.secondary_system is None
+
+
 class TestHeatingAndHotWater:
     @pytest.fixture
     def hhw(self) -> HeatingAndHotWater:
diff --git a/datatypes/epc/surveys/pashub_rdsap_site_notes.py b/datatypes/epc/surveys/pashub_rdsap_site_notes.py
index 31e189a5..1f46b613 100644
--- a/datatypes/epc/surveys/pashub_rdsap_site_notes.py
+++ b/datatypes/epc/surveys/pashub_rdsap_site_notes.py
@@ -179,6 +179,7 @@ class MainHeating:
 @dataclass
 class SecondaryHeating:
     secondary_fuel: str
+    secondary_system: Optional[str] = None
 
 
 @dataclass