diff --git a/src/HPWH.cc b/src/HPWH.cc
index 7eb137f2..c69c5c46 100644
--- a/src/HPWH.cc
+++ b/src/HPWH.cc
@@ -2572,7 +2572,7 @@ double HPWH::getCompressorMinRuntime(UNITS units /*=UNITS_MIN*/) const
     return minimumRuntime;
 }
 
-int HPWH::getSizingFractions(double& aquaFract, double& useableFract) const
+void HPWH::getSizingFractions(double& aquaFract, double& useableFract) const
 {
     double aFract = 1.;
     double useFract = 1.;
@@ -2628,8 +2628,6 @@ int HPWH::getSizingFractions(double& aquaFract, double& useableFract) const
     {
         useableFract = 1. - aquaFract + TOL_MINVALUE;
     }
-
-    return 0;
 }
 
 bool HPWH::isHPWHScalable() const { return canScale; }
diff --git a/src/HPWH.hh b/src/HPWH.hh
index 1a0de693..3a33d436 100644
--- a/src/HPWH.hh
+++ b/src/HPWH.hh
@@ -897,7 +897,7 @@ class HPWH : public Courier::Sender
 
     double getCompressorMinRuntime(UNITS units = UNITS_MIN) const;
 
-    int getSizingFractions(double& aquafract, double& percentUseable) const;
+    void getSizingFractions(double& aquafract, double& percentUseable) const;
     /**< returns the fraction of total tank volume from the bottom up where the aquastat is
     or the turn on logic for the compressor, and the USEable fraction of storage or 1 minus
     where the shut off logic is for the compressor. If the logic spans multiple nodes it
diff --git a/test/unit_tests/sizingFractionsTest.cpp b/test/unit_tests/sizingFractionsTest.cpp
index c4e3a1ce..0c1ed691 100644
--- a/test/unit_tests/sizingFractionsTest.cpp
+++ b/test/unit_tests/sizingFractionsTest.cpp
@@ -22,7 +22,7 @@ TEST(SizingFractionsTest, TamScalable_SP_SizingFract)
     double aquaFrac, useableFrac;
     const double aquaFrac_answer = 4. / logicSize;
 
-    EXPECT_EQ(hpwh.getSizingFractions(aquaFrac, useableFrac), 0);
+    hpwh.getSizingFractions(aquaFrac, useableFrac);
     EXPECT_NEAR(aquaFrac, aquaFrac_answer, tol);
     EXPECT_NEAR(useableFrac, 1. - 1. / logicSize, tol);
 }
@@ -40,7 +40,7 @@ TEST(SizingFractionsTest, Sanden80_SizingFract)
     double aquaFrac, useableFrac;
     const double aquaFrac_answer = 8. / logicSize;
 
-    EXPECT_EQ(hpwh.getSizingFractions(aquaFrac, useableFrac), 0);
+    hpwh.getSizingFractions(aquaFrac, useableFrac);
     EXPECT_NEAR(aquaFrac, aquaFrac_answer, tol);
     EXPECT_NEAR(useableFrac, 1. - 1. / logicSize, tol);
 }
@@ -58,7 +58,7 @@ TEST(SizingFractionsTest, ColmacCxV_5_SP_SizingFract)
     double aquaFrac, useableFrac;
     const double aquaFrac_answer = 4. / logicSize;
 
-    EXPECT_EQ(hpwh.getSizingFractions(aquaFrac, useableFrac), 0);
+    hpwh.getSizingFractions(aquaFrac, useableFrac);
     EXPECT_NEAR(aquaFrac, aquaFrac_answer, tol);
     EXPECT_NEAR(useableFrac, 1. - 1. / logicSize, tol);
 }
@@ -76,7 +76,7 @@ TEST(SizingFractionsTest, AOSmithHPTU50_SizingFract)
     double aquaFrac, useableFrac;
     const double aquaFrac_answer = (1. + 2. + 3. + 4.) / 4. / logicSize;
 
-    EXPECT_EQ(hpwh.getSizingFractions(aquaFrac, useableFrac), 0);
+    hpwh.getSizingFractions(aquaFrac, useableFrac);
     EXPECT_NEAR(aquaFrac, aquaFrac_answer, tol);
     EXPECT_NEAR(useableFrac, 1., tol);
 }
@@ -94,7 +94,7 @@ TEST(SizingFractionsTest, GE_SizingFract)
     double aquaFrac, useableFrac;
     const double aquaFrac_answer = (1. + 2. + 3. + 4.) / 4. / logicSize;
 
-    EXPECT_EQ(hpwh.getSizingFractions(aquaFrac, useableFrac), 0);
+    hpwh.getSizingFractions(aquaFrac, useableFrac);
     EXPECT_NEAR(aquaFrac, aquaFrac_answer, tol);
     EXPECT_NEAR(useableFrac, 1., tol);
 }
@@ -112,7 +112,7 @@ TEST(SizingFractionsTest, Stiebel220e_SizingFract)
     double aquaFrac, useableFrac;
     const double aquaFrac_answer = (5. + 6.) / 2. / logicSize;
 
-    EXPECT_EQ(hpwh.getSizingFractions(aquaFrac, useableFrac), 0);
+    hpwh.getSizingFractions(aquaFrac, useableFrac);
     EXPECT_NEAR(aquaFrac, aquaFrac_answer, tol);
     EXPECT_NEAR(useableFrac, 1. - 1. / logicSize, tol);
 }