diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 0e5dc569..8b3603b0 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -1564,4 +1564,5 @@ def _map_sap_heating(
         shower_outlets=shower_outlets,
         cylinder_size=heating.water_heating.cylinder_size if heating.water_heating.cylinder_size != "No Cylinder" else None,
         cylinder_insulation_thickness_mm=heating.water_heating.insulation_thickness_mm,
+        immersion_heating_type=heating.water_heating.immersion_type,
     )