Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r6b13bb16465fb2eee853288fe0d109223d978cdd -r92c8880660a5d7c3b7a098dd61e13b7f7af987f6
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 6b13bb16465fb2eee853288fe0d109223d978cdd)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 92c8880660a5d7c3b7a098dd61e13b7f7af987f6)
@@ -700,7 +700,7 @@
 static F32 calculatePrimaryHeaterDutyCycle( F32 targetTemperature, F32 currentTemperature, F32 flow, BOOL checkEfficiency )
 {
     // Get the primary heater's efficiency and the last fill temperature from the ModeFill
-    F32 heaterEfficiency = heatersStatus[ DG_PRIMARY_HEATER ].heaterEfficiency;
+    F32 heaterEfficiency = heatersStatus[ DG_PRIMARY_HEATER ].heaterEstGain;
 
 #ifndef _RELEASE_
     if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_HEATERS_EFFICIENCY ) != SW_CONFIG_ENABLE_VALUE )
@@ -728,7 +728,7 @@
             heaterEfficiency = MAX( heaterEfficiency, 0.0 );
 
             // Update the heaters efficiency
-            heatersStatus[ DG_PRIMARY_HEATER ].heaterEfficiency = heaterEfficiency;
+            heatersStatus[ DG_PRIMARY_HEATER ].heaterEstGain = heaterEfficiency;
         }
     }