diff --git a/src/main/java/gregtech/api/nuclear/fission/FissionFuelRegistry.java b/src/main/java/gregtech/api/nuclear/fission/FissionFuelRegistry.java
index 2ccca109ae7..8b64091072e 100644
--- a/src/main/java/gregtech/api/nuclear/fission/FissionFuelRegistry.java
+++ b/src/main/java/gregtech/api/nuclear/fission/FissionFuelRegistry.java
@@ -42,8 +42,7 @@ public static IFissionFuelStats getFissionFuel(int hash) {
         return HASHED_FUELS.get(hash);
     }
 
-    @Nullable
-    public static ItemStack getDepletedFuel(IFissionFuelStats stats) {
-        return DEPLETED_FUELS.get(stats);
+    public static @NotNull ItemStack getDepletedFuel(IFissionFuelStats stats) {
+        return DEPLETED_FUELS.get(stats).copy();
     }
 }
diff --git a/src/main/java/gregtech/common/ConfigHolder.java b/src/main/java/gregtech/common/ConfigHolder.java
index 92746ad99d9..9444138c729 100644
--- a/src/main/java/gregtech/common/ConfigHolder.java
+++ b/src/main/java/gregtech/common/ConfigHolder.java
@@ -182,7 +182,7 @@ public static class NuclearOptions {
             @Config.Comment({ "Nuclear coolant heat exchanger recipe efficiency multiplier for balancing purposes",
                     "Default: 0.1" })
             @Config.RangeDouble(min = 0, max = 1000)
-            public double heatExchangerEfficiencyMultiplier = 0.0625;
+            public double heatExchangerEfficiencyMultiplier = 0.25;
         }
     }
 
diff --git a/src/main/java/gregtech/loaders/recipe/handlers/FluidRecipeHandler.java b/src/main/java/gregtech/loaders/recipe/handlers/FluidRecipeHandler.java
index 807adf67597..8c5e54fe7be 100644
--- a/src/main/java/gregtech/loaders/recipe/handlers/FluidRecipeHandler.java
+++ b/src/main/java/gregtech/loaders/recipe/handlers/FluidRecipeHandler.java
@@ -22,9 +22,8 @@ public static void processCoolant(Material mat, CoolantProperty coolant) {
         double multiplier = ConfigHolder.machines.nuclear.heatExchangerEfficiencyMultiplier;
 
         // water temp difference * water heat capacity * amount / coolantHeatCapacity * (hotHpTemp - coolantTemp)
-        int coolantAmt = (int) Math.ceil(100 * 4168 * waterAmt / (coolant.getSpecificHeatCapacity() *
-                (coolant.getHotHPCoolant().getFluid().getTemperature() - mat.getFluid().getTemperature())) *
-                multiplier);
+        int coolantAmt = (int) Math.ceil(100 * 4168 * waterAmt * multiplier / (coolant.getSpecificHeatCapacity() *
+                (coolant.getHotHPCoolant().getFluid().getTemperature() - mat.getFluid().getTemperature())));
 
         RecipeMaps.HEAT_EXCHANGER_RECIPES.recipeBuilder().duration(1).circuitMeta(1)
                 .fluidInputs(coolant.getHotHPCoolant().getFluid(coolantAmt), Materials.Water.getFluid(waterAmt))
@@ -36,9 +35,8 @@ public static void processCoolant(Material mat, CoolantProperty coolant) {
                 .fluidOutputs(mat.getFluid(coolantAmt), Materials.Steam.getFluid(waterAmt * 160)).buildAndRegister();
         waterAmt = 600;
         // Slightly more efficient
-        coolantAmt = (int) Math.ceil(100 * 4168 * waterAmt / (coolant.getSpecificHeatCapacity() *
-                (coolant.getHotHPCoolant().getFluid().getTemperature() - mat.getFluid().getTemperature())) *
-                multiplier);
+        coolantAmt = (int) Math.ceil(100 * 4168 * waterAmt * multiplier / (coolant.getSpecificHeatCapacity() *
+                (coolant.getHotHPCoolant().getFluid().getTemperature() - mat.getFluid().getTemperature())));;
 
         RecipeMaps.HEAT_EXCHANGER_RECIPES.recipeBuilder().duration(1).circuitMeta(2)
                 .fluidInputs(coolant.getHotHPCoolant().getFluid(coolantAmt), Materials.Water.getFluid(waterAmt))