diff --git a/datatypes/epc/domain/tests/test_from_site_notes.py b/datatypes/epc/domain/tests/test_from_site_notes.py
index b5dd445b8..e2820588d 100644
--- a/datatypes/epc/domain/tests/test_from_site_notes.py
+++ b/datatypes/epc/domain/tests/test_from_site_notes.py
@@ -203,6 +203,9 @@ class TestMainFuelCoding:
             ("Mains gas", 26),  # standard mains-gas fuel code (landed #1554)
             ("Mains Gas", 26),  # `Fuel:` form capitalisation variant → same code
             ("Bulk LPG", 27),  # bulk LPG (Table 32 code 2), matches Elmhurst map
+            # Room-heater dual-fuel appliance; `Fuel:`-form label the extractor
+            # was dropping. 10 = epc_codes `main_fuel` dual fuel (mineral + wood).
+            ("Dual fuel appliance (mineral and wood)", 10),
             ("Electricity", 30),  # standard-electricity fuel code
         ],
     )