diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 93f76fdb3..16b52686b 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -7890,6 +7890,11 @@ _PASHUB_SECONDARY_FUEL_TO_SAP10: Dict[str, int] = {
     # Solid-fuel secondary heater burning house coal → Table 32 code 11 (House
     # coal), the same code the solid-fuel main-heating path pins (SAP 631 → 11).
     "House Coal": 11,
+    # Dual-fuel (mineral + wood) secondary heater, e.g. an open fire in grate.
+    # Same fuel, same Table 32 code as the main-fuel path pins for the
+    # sentence-case label (10 — see `_PASHUB_MAIN_FUEL_TO_SAP10`); the
+    # secondary-heating survey field lodges it title-cased.
+    "Dual Fuel Appliance (Mineral and Wood)": 10,
 }