diff --git a/backend/Funding.py b/backend/Funding.py
index 432b6ff6..3cfe14cc 100644
--- a/backend/Funding.py
+++ b/backend/Funding.py
@@ -442,6 +442,10 @@ class Funding:
                 return "Electric Storage Heaters Responsiveness <=0.2"
             return "Electric Storage Heaters Responsiveness >0.2"
 
+        # direct-acting electric space heating (no storage)
+        if mainheating["has_electric_underfloor_heating"] or mainheating["has_electric_ceiling_heating"]:
+            return "Electric Room Heaters"
+
         raise ValueError("Invalid pre heating system")
 
     def calculate_partial_project_abs(