diff --git a/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/bottomWater/thermophysicalProperties b/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/bottomWater/thermophysicalProperties
index 03a2776252..c1602d4d09 100644
--- a/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/bottomWater/thermophysicalProperties
+++ b/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/bottomWater/thermophysicalProperties
@@ -17,7 +17,7 @@ FoamFile
 thermoType
 {
     type            heRhoThermo;
-    mixture         singleComponentMixture;
+    mixture         pureMixture;
     transport       const;
     thermo          hConst;
     equationOfState rhoConst;
diff --git a/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/topAir/thermophysicalProperties b/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/topAir/thermophysicalProperties
index bbd0bb688e..3f94dc8ad7 100644
--- a/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/topAir/thermophysicalProperties
+++ b/tutorials/heatTransfer/chtMultiRegionFoam/multiRegionHeater/constant/topAir/thermophysicalProperties
@@ -17,7 +17,7 @@ FoamFile
 thermoType
 {
     type            heRhoThermo;
-    mixture         singleComponentMixture;
+    mixture         pureMixture;
     transport       const;
     thermo          hConst;
     equationOfState perfectGas;
diff --git a/tutorials/heatTransfer/chtMultiRegionFoam/snappyMultiRegionHeater/constant/bottomAir/thermophysicalProperties b/tutorials/heatTransfer/chtMultiRegionFoam/snappyMultiRegionHeater/constant/bottomAir/thermophysicalProperties
index bbd0bb688e..3f94dc8ad7 100644
--- a/tutorials/heatTransfer/chtMultiRegionFoam/snappyMultiRegionHeater/constant/bottomAir/thermophysicalProperties
+++ b/tutorials/heatTransfer/chtMultiRegionFoam/snappyMultiRegionHeater/constant/bottomAir/thermophysicalProperties
@@ -17,7 +17,7 @@ FoamFile
 thermoType
 {
     type            heRhoThermo;
-    mixture         singleComponentMixture;
+    mixture         pureMixture;
     transport       const;
     thermo          hConst;
     equationOfState perfectGas;