diff --git a/opm/simulators/utils/ParallelRestart.cpp b/opm/simulators/utils/ParallelRestart.cpp
index ff0505f3f..d4301395a 100644
--- a/opm/simulators/utils/ParallelRestart.cpp
+++ b/opm/simulators/utils/ParallelRestart.cpp
@@ -799,6 +799,29 @@ std::size_t packSize(const OilPvtThermal<Scalar>& data,
 template std::size_t packSize(const OilPvtThermal<double>& data,
                               Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar, bool enableThermal>
+std::size_t packSize(const WaterPvtMultiplexer<Scalar,enableThermal>& data,
+                     Dune::MPIHelper::MPICommunicator comm)
+{
+    std::size_t size = packSize(data.approach(), comm);
+    const void* realWaterPvt = data.realWaterPvt();
+    using PvtApproach = WaterPvtMultiplexer<Scalar,enableThermal>;
+    if (data.approach() == PvtApproach::ConstantCompressibilityWaterPvt) {
+        const auto& pvt = *static_cast<const ConstantCompressibilityWaterPvt<Scalar>*>(realWaterPvt);
+        size += packSize(pvt, comm);
+    } else if (data.approach() == PvtApproach::ThermalWaterPvt) {
+        const auto& pvt = *static_cast<const WaterPvtThermal<Scalar>*>(realWaterPvt);
+        size += packSize(pvt, comm);
+    }
+
+    return size;
+}
+
+template std::size_t packSize(const WaterPvtMultiplexer<double,true>& data,
+                              Dune::MPIHelper::MPICommunicator comm);
+template std::size_t packSize(const WaterPvtMultiplexer<double,false>& data,
+                              Dune::MPIHelper::MPICommunicator comm);
+
 template<class Scalar>
 std::size_t packSize(const ConstantCompressibilityWaterPvt<Scalar>& data,
                      Dune::MPIHelper::MPICommunicator comm)
@@ -814,6 +837,34 @@ std::size_t packSize(const ConstantCompressibilityWaterPvt<Scalar>& data,
 template std::size_t packSize(const ConstantCompressibilityWaterPvt<double>& data,
                               Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar>
+std::size_t packSize(const WaterPvtThermal<Scalar>& data,
+                     Dune::MPIHelper::MPICommunicator comm)
+{
+    std::size_t size = packSize(data.viscrefPress(), comm) +
+                       packSize(data.watdentRefTemp(), comm) +
+                       packSize(data.watdentCT1(), comm) +
+                       packSize(data.watdentCT2(), comm) +
+                       packSize(data.pvtwRefPress(), comm) +
+                       packSize(data.pvtwRefB(), comm) +
+                       packSize(data.pvtwCompressibility(), comm) +
+                       packSize(data.pvtwViscosity(), comm) +
+                       packSize(data.pvtwViscosibility(), comm) +
+                       packSize(data.watvisctCurves(), comm) +
+                       packSize(data.internalEnergyCurves(), comm) +
+                       packSize(data.enableThermalDensity(), comm) +
+                       packSize(data.enableThermalViscosity(), comm) +
+                       packSize(data.enableInternalEnergy(), comm);
+    size += packSize(bool(), comm);
+    if (data.isoThermalPvt())
+        size += packSize(*data.isoThermalPvt(), comm);
+
+    return size;
+}
+
+template std::size_t packSize(const WaterPvtThermal<double>& data,
+                              Dune::MPIHelper::MPICommunicator comm);
+
 ////// pack routines
 
 template<class T>
@@ -1620,6 +1671,30 @@ template void pack(const OilPvtThermal<double>& data,
                    std::vector<char>& buffer, int& position,
                    Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar, bool enableThermal>
+void pack(const WaterPvtMultiplexer<Scalar,enableThermal>& data,
+          std::vector<char>& buffer, int& position,
+          Dune::MPIHelper::MPICommunicator comm)
+{
+    pack(data.approach(), buffer, position, comm);
+    const void* realWaterPvt = data.realWaterPvt();
+    using PvtApproach = WaterPvtMultiplexer<Scalar,enableThermal>;
+    if (data.approach() == PvtApproach::ConstantCompressibilityWaterPvt) {
+        const auto& pvt = *static_cast<const ConstantCompressibilityWaterPvt<Scalar>*>(realWaterPvt);
+        pack(pvt, buffer, position, comm);
+    } else if (data.approach() == PvtApproach::ThermalWaterPvt) {
+        const auto& pvt = *static_cast<const WaterPvtThermal<Scalar>*>(realWaterPvt);
+        pack(pvt, buffer, position, comm);
+    }
+}
+
+template void pack(const WaterPvtMultiplexer<double,true>& data,
+                   std::vector<char>& buffer, int& position,
+                   Dune::MPIHelper::MPICommunicator comm);
+template void pack(const WaterPvtMultiplexer<double,false>& data,
+                   std::vector<char>& buffer, int& position,
+                   Dune::MPIHelper::MPICommunicator comm);
+
 template<class Scalar>
 void pack(const ConstantCompressibilityWaterPvt<Scalar>& data,
           std::vector<char>& buffer, int& position,
@@ -1637,6 +1712,34 @@ template void pack(const ConstantCompressibilityWaterPvt<double>& data,
                    std::vector<char>& buffer, int& position,
                    Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar>
+void pack(const WaterPvtThermal<Scalar>& data,
+          std::vector<char>& buffer, int& position,
+          Dune::MPIHelper::MPICommunicator comm)
+{
+    pack(data.viscrefPress(), buffer, position, comm);
+    pack(data.watdentRefTemp(), buffer, position, comm);
+    pack(data.watdentCT1(), buffer, position, comm);
+    pack(data.watdentCT2(), buffer, position, comm);
+    pack(data.pvtwRefPress(), buffer, position, comm);
+    pack(data.pvtwRefB(), buffer, position, comm);
+    pack(data.pvtwCompressibility(), buffer, position, comm);
+    pack(data.pvtwViscosity(), buffer, position, comm);
+    pack(data.pvtwViscosibility(), buffer, position, comm);
+    pack(data.watvisctCurves(), buffer, position, comm);
+    pack(data.internalEnergyCurves(), buffer, position, comm);
+    pack(data.enableThermalDensity(), buffer, position, comm);
+    pack(data.enableThermalViscosity(), buffer, position, comm);
+    pack(data.enableInternalEnergy(), buffer, position, comm);
+    pack(data.isoThermalPvt() != nullptr, buffer, position, comm);
+    if (data.isoThermalPvt())
+        pack(*data.isoThermalPvt(), buffer, position, comm);
+}
+
+template void pack(const WaterPvtThermal<double>& data,
+                   std::vector<char>& buffer, int& position,
+                   Dune::MPIHelper::MPICommunicator comm);
+
 /// unpack routines
 
 template<class T>
@@ -2707,6 +2810,34 @@ template void unpack(OilPvtThermal<double>& data,
                      std::vector<char>& buffer, int& position,
                      Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar, bool enableThermal>
+void unpack(WaterPvtMultiplexer<Scalar,enableThermal>& data,
+            std::vector<char>& buffer, int& position,
+            Dune::MPIHelper::MPICommunicator comm)
+{
+    typename WaterPvtMultiplexer<Scalar,enableThermal>::WaterPvtApproach approach;
+    unpack(approach, buffer, position, comm);
+    using PvtApproach = WaterPvtMultiplexer<Scalar,enableThermal>;
+    void* pvt = nullptr;
+    if (approach == PvtApproach::ConstantCompressibilityWaterPvt) {
+        auto* realPvt = new ConstantCompressibilityWaterPvt<Scalar>;
+        unpack(*realPvt, buffer, position, comm);
+        pvt = realPvt;
+    } else if (data.approach() == PvtApproach::ThermalWaterPvt) {
+        auto* realPvt = new WaterPvtThermal<Scalar>;
+        unpack(*realPvt, buffer, position, comm);
+        pvt = realPvt;
+    }
+    data = WaterPvtMultiplexer<Scalar,enableThermal>(approach, pvt);
+}
+
+template void unpack(WaterPvtMultiplexer<double,true>& data,
+                     std::vector<char>& buffer, int& position,
+                     Dune::MPIHelper::MPICommunicator comm);
+template void unpack(WaterPvtMultiplexer<double,false>& data,
+                     std::vector<char>& buffer, int& position,
+                     Dune::MPIHelper::MPICommunicator comm);
+
 template<class Scalar>
 void unpack(ConstantCompressibilityWaterPvt<Scalar>& data,
             std::vector<char>& buffer, int& position,
@@ -2734,6 +2865,55 @@ template void unpack(ConstantCompressibilityWaterPvt<double>& data,
                      std::vector<char>& buffer, int& position,
                      Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar>
+void unpack(WaterPvtThermal<Scalar>& data,
+            std::vector<char>& buffer, int& position,
+            Dune::MPIHelper::MPICommunicator comm)
+{
+    std::vector<Scalar> viscrefPress, watdentRefTemp, watdentCT1, watdentCT2,
+                        pvtwRefPress, pvtwRefB, pvtwCompressibility,
+                        pvtwViscosity, pvtwViscosibility;
+    std::vector<typename WaterPvtThermal<Scalar>::TabulatedOneDFunction> watvisctCurves;
+    std::vector<typename WaterPvtThermal<Scalar>::TabulatedOneDFunction> internalEnergyCurves;
+    bool enableThermalDensity, enableThermalViscosity, enableInternalEnergy;
+    unpack(viscrefPress, buffer, position, comm);
+    unpack(watdentRefTemp, buffer, position, comm);
+    unpack(watdentCT1, buffer, position, comm);
+    unpack(watdentCT2, buffer, position, comm);
+    unpack(pvtwRefPress, buffer, position, comm);
+    unpack(pvtwRefB, buffer, position, comm);
+    unpack(pvtwCompressibility, buffer, position, comm);
+    unpack(pvtwViscosity, buffer, position, comm);
+    unpack(pvtwViscosibility, buffer, position, comm);
+    unpack(watvisctCurves, buffer, position, comm);
+    unpack(internalEnergyCurves, buffer, position, comm);
+    unpack(enableThermalDensity, buffer, position, comm);
+    unpack(enableThermalViscosity, buffer, position, comm);
+    unpack(enableInternalEnergy, buffer, position, comm);
+    bool isothermal;
+    unpack(isothermal, buffer, position, comm);
+    typename WaterPvtThermal<Scalar>::IsothermalPvt* pvt = nullptr;
+    if (isothermal) {
+        pvt = new typename WaterPvtThermal<Scalar>::IsothermalPvt;
+        unpack(*pvt, buffer, position, comm);
+    }
+    data = WaterPvtThermal<Scalar>(pvt, viscrefPress, watdentRefTemp,
+                                   watdentCT1, watdentCT2,
+                                   pvtwRefPress, pvtwRefB,
+                                   pvtwCompressibility,
+                                   pvtwViscosity,
+                                   pvtwViscosibility,
+                                   watvisctCurves,
+                                   internalEnergyCurves,
+                                   enableThermalDensity,
+                                   enableThermalViscosity,
+                                   enableInternalEnergy);
+}
+
+template void unpack(WaterPvtThermal<double>& data,
+                     std::vector<char>& buffer, int& position,
+                     Dune::MPIHelper::MPICommunicator comm);
+
 } // end namespace Mpi
 RestartValue loadParallelRestart(const EclipseIO* eclIO, SummaryState& summaryState,
                                  const std::vector<Opm::RestartKey>& solutionKeys,
diff --git a/opm/simulators/utils/ParallelRestart.hpp b/opm/simulators/utils/ParallelRestart.hpp
index 9b73ecb5f..47e7f77d2 100644
--- a/opm/simulators/utils/ParallelRestart.hpp
+++ b/opm/simulators/utils/ParallelRestart.hpp
@@ -34,6 +34,7 @@
 #include <opm/material/fluidsystems/blackoilpvt/LiveOilPvt.hpp>
 #include <opm/material/fluidsystems/blackoilpvt/OilPvtMultiplexer.hpp>
 #include <opm/material/fluidsystems/blackoilpvt/SolventPvt.hpp>
+#include <opm/material/fluidsystems/blackoilpvt/WaterPvtMultiplexer.hpp>
 #include <opm/material/fluidsystems/blackoilpvt/WetGasPvt.hpp>
 #include <opm/output/eclipse/RestartValue.hpp>
 #include <opm/output/eclipse/EclipseIO.hpp>
@@ -201,10 +202,17 @@ std::size_t packSize(const LiveOilPvt<Scalar>& data,
 template<class Scalar>
 std::size_t packSize(const OilPvtThermal<Scalar>& data, Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar, bool enableThermal>
+std::size_t packSize(const WaterPvtMultiplexer<Scalar,enableThermal>& data,
+                     Dune::MPIHelper::MPICommunicator comm);
+
 template<class Scalar>
 std::size_t packSize(const ConstantCompressibilityWaterPvt<Scalar>& data,
                      Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar>
+std::size_t packSize(const WaterPvtThermal<Scalar>& data, Dune::MPIHelper::MPICommunicator comm);
+
 ////// pack routines
 
 template<class T>
@@ -321,11 +329,20 @@ template<class Scalar>
 void pack(const OilPvtThermal<Scalar>& data, std::vector<char>& buffer,
           int& position, Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar, bool enableThermal>
+void pack(const WaterPvtMultiplexer<Scalar,enableThermal>& data,
+          const std::vector<char>& buffer, int& position,
+          Dune::MPIHelper::MPICommunicator comm);
+
 template<class Scalar>
 void pack(const ConstantCompressibilityWaterPvt<Scalar>& data,
           std::vector<char>& buffer, int& position,
           Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar>
+void pack(const WaterPvtThermal<Scalar>& data, std::vector<char>& buffer,
+          int& position, Dune::MPIHelper::MPICommunicator comm);
+
 void pack(const char* str, std::vector<char>& buffer, int& position,
           Dune::MPIHelper::MPICommunicator comm);
 
@@ -442,6 +459,15 @@ template<class Scalar>
 void unpack(OilPvtThermal<Scalar>& data, std::vector<char>& buffer,
             int& position, Dune::MPIHelper::MPICommunicator comm);
 
+template<class Scalar, bool enableThermal>
+void unpack(WaterPvtMultiplexer<Scalar,enableThermal>& data,
+            const std::vector<char>& buffer, int& position,
+            Dune::MPIHelper::MPICommunicator comm);
+
+template<class Scalar>
+void unpack(WaterPvtThermal<Scalar>& data, std::vector<char>& buffer,
+            int& position, Dune::MPIHelper::MPICommunicator comm);
+
 template<class Scalar>
 void unpack(ConstantCompressibilityWaterPvt<Scalar>& data, std::vector<char>& buffer,
             int& position, Dune::MPIHelper::MPICommunicator comm);
diff --git a/tests/test_ParallelRestart.cpp b/tests/test_ParallelRestart.cpp
index 01dd855bd..5275822d9 100644
--- a/tests/test_ParallelRestart.cpp
+++ b/tests/test_ParallelRestart.cpp
@@ -1148,6 +1148,23 @@ BOOST_AUTO_TEST_CASE(ConstantCompressibilityWaterPvt)
 }
 
 
+BOOST_AUTO_TEST_CASE(WaterPvtThermal)
+{
+#ifdef HAVE_MPI
+    Opm::Tabulated1DFunction<double> func(2, std::vector<double>{1.0, 2.0},
+                                             std::vector<double>{3.0, 4.0});
+    Opm::WaterPvtThermal<double>::IsothermalPvt* pvt = new Opm::WaterPvtThermal<double>::IsothermalPvt;
+    Opm::WaterPvtThermal<double> val1(pvt, {1.0, 2.0}, {3.0, 4.0}, {5.0, 6.0},
+                                      {7.0, 8.0}, {9.0, 10.0}, {11.0, 12.0},
+                                      {13.0, 14.0}, {15.0, 16.0}, {17.0, 18.0},
+                                      {func}, {func}, true, true, false);
+    auto val2 = PackUnpack(val1);
+    BOOST_CHECK(std::get<1>(val2) == std::get<2>(val2));
+    BOOST_CHECK(val1 == std::get<0>(val2));
+#endif
+}
+
+
 bool init_unit_test_func()
 {
     return true;