diff --git a/datatypes/epc/domain/tests/test_from_site_notes.py b/datatypes/epc/domain/tests/test_from_site_notes.py
index e23d71f57..53917b864 100644
--- a/datatypes/epc/domain/tests/test_from_site_notes.py
+++ b/datatypes/epc/domain/tests/test_from_site_notes.py
@@ -165,10 +165,9 @@ class TestFromSiteNotesExample1:
         assert result.sap_heating.main_heating_details[0].main_fuel_type == 26
 
     def test_main_heating_emitter(self, result: EpcPropertyData) -> None:
-        # heating_and_hot_water.main_heating.emitter: "Radiators"
-        assert (
-            result.sap_heating.main_heating_details[0].heat_emitter_type == "Radiators"
-        )
+        # heating_and_hot_water.main_heating.emitter: "Radiators" is normalized
+        # at the mapper boundary to SAP10 emitter code 1 (matching Elmhurst).
+        assert result.sap_heating.main_heating_details[0].heat_emitter_type == 1
 
     def test_main_heating_no_fghrs(self, result: EpcPropertyData) -> None:
         # heating_and_hot_water.main_heating.flue_gas_heat_recovery_system: false
@@ -380,7 +379,7 @@ class TestFromSiteNotesExample1:
                     MainHeatingDetail(
                         has_fghrs=False,
                         main_fuel_type=26,
-                        heat_emitter_type="Radiators",
+                        heat_emitter_type=1,
                         emitter_temperature="Unknown",
                         fan_flue_present=True,
                         main_heating_control="Programmer, room thermostat and TRVs",