diff --git a/ProcessLib/HT/CreateHTProcess.cpp b/ProcessLib/HT/CreateHTProcess.cpp
index 64b035991732e7ff91d1a87109932536b0974453..2e04db783420800b42b3c1a19b1d538ca7f8be5a 100644
--- a/ProcessLib/HT/CreateHTProcess.cpp
+++ b/ProcessLib/HT/CreateHTProcess.cpp
@@ -119,31 +119,7 @@ std::unique_ptr<Process> createHTProcess(
         &default_thermal_dispersivity_longitudinal;
     ParameterLib::Parameter<double>* thermal_dispersivity_transversal =
         &default_thermal_dispersivity_transversal;
-    auto const dispersion_config =
-        //! \ogs_file_param{prj__processes__process__HT__thermal_dispersivity}
-        config.getConfigSubtreeOptional("thermal_dispersivity");
-    bool const has_fluid_thermal_dispersivity =
-        static_cast<bool>(dispersion_config);
-    if (dispersion_config)
-    {
-        thermal_dispersivity_longitudinal = &ParameterLib::findParameter<
-            double>(
-            *dispersion_config,
-            //! \ogs_file_param_special{prj__processes__process__HT__thermal_dispersivity__longitudinal}
-            "longitudinal", parameters, 1);
-        DBUG("Use '%s' as thermal_dispersivity_longitudinal parameter.",
-             thermal_dispersivity_longitudinal->name.c_str());
-
-        // Parameter for the thermal conductivity of the solid (only one scalar
-        // per
-        // element, i.e., the isotropic case is handled at the moment)
-        thermal_dispersivity_transversal = &ParameterLib::findParameter<double>(
-            *dispersion_config,
-            //! \ogs_file_param_special{prj__processes__process__HT__thermal_dispersivity__transversal}
-            "transversal", parameters, 1);
-        DBUG("Use '%s' as thermal_dispersivity_transversal parameter.",
-             thermal_dispersivity_transversal->name.c_str());
-    }
+    bool const has_fluid_thermal_dispersivity = true;
 
     // Parameter for the thermal conductivity of the solid (only one scalar per
     // element, i.e., the isotropic case is handled at the moment)
@@ -154,14 +130,6 @@ std::unique_ptr<Process> createHTProcess(
     DBUG("Use '%s' as thermal_conductivity_solid parameter.",
          thermal_conductivity_solid.name.c_str());
 
-    // Parameter for the thermal conductivity of the fluid.
-    auto& thermal_conductivity_fluid = ParameterLib::findParameter<double>(
-        config,
-        //! \ogs_file_param_special{prj__processes__process__HT__thermal_conductivity_fluid}
-        "thermal_conductivity_fluid", parameters, 1);
-    DBUG("Use '%s' as thermal_conductivity_fluid parameter.",
-         thermal_conductivity_fluid.name.c_str());
-
     // Specific body force parameter.
     Eigen::VectorXd specific_body_force;
     std::vector<double> const b =
@@ -228,11 +196,8 @@ std::unique_ptr<Process> createHTProcess(
             std::move(fluid_properties),
             std::move(media_map),
             has_fluid_thermal_dispersivity,
-            *thermal_dispersivity_longitudinal,
-            *thermal_dispersivity_transversal,
             specific_heat_capacity_solid,
             thermal_conductivity_solid,
-            thermal_conductivity_fluid,
             has_fluid_thermal_expansion,
             *solid_thermal_expansion,
             *biot_constant,
diff --git a/ProcessLib/HT/HTMaterialProperties.h b/ProcessLib/HT/HTMaterialProperties.h
index fd52906b1fa484f313a2470b7574cd75e6af64fe..175e2ecfd5c4304ed5a3cdbc1403d0efd7ef2d7c 100644
--- a/ProcessLib/HT/HTMaterialProperties.h
+++ b/ProcessLib/HT/HTMaterialProperties.h
@@ -34,13 +34,8 @@ struct HTMaterialProperties final
         std::unique_ptr<MaterialPropertyLib::MaterialSpatialDistributionMap>&&
             media_map_,
         bool const has_fluid_thermal_dispersivity_,
-        ParameterLib::Parameter<double> const&
-            thermal_dispersivity_longitudinal_,
-        ParameterLib::Parameter<double> const&
-            thermal_dispersivity_transversal_,
         ParameterLib::Parameter<double> const& specific_heat_capacity_solid_,
         ParameterLib::Parameter<double> const& thermal_conductivity_solid_,
-        ParameterLib::Parameter<double> const& thermal_conductivity_fluid_,
         bool const has_fluid_thermal_expansion_,
         ParameterLib::Parameter<double> const& solid_thermal_expansion_,
         ParameterLib::Parameter<double> const& biot_constant_,
@@ -52,10 +47,7 @@ struct HTMaterialProperties final
           media_map(std::move(media_map_)),
           specific_heat_capacity_solid(specific_heat_capacity_solid_),
           has_fluid_thermal_dispersivity(has_fluid_thermal_dispersivity_),
-          thermal_dispersivity_longitudinal(thermal_dispersivity_longitudinal_),
-          thermal_dispersivity_transversal(thermal_dispersivity_transversal_),
           thermal_conductivity_solid(thermal_conductivity_solid_),
-          thermal_conductivity_fluid(thermal_conductivity_fluid_),
           has_fluid_thermal_expansion(has_fluid_thermal_expansion_),
           solid_thermal_expansion(solid_thermal_expansion_),
           biot_constant(biot_constant_),
@@ -76,10 +68,7 @@ struct HTMaterialProperties final
         media_map;
     ParameterLib::Parameter<double> const& specific_heat_capacity_solid;
     bool const has_fluid_thermal_dispersivity;
-    ParameterLib::Parameter<double> const& thermal_dispersivity_longitudinal;
-    ParameterLib::Parameter<double> const& thermal_dispersivity_transversal;
     ParameterLib::Parameter<double> const& thermal_conductivity_solid;
-    ParameterLib::Parameter<double> const& thermal_conductivity_fluid;
 
     bool const has_fluid_thermal_expansion;
     ParameterLib::Parameter<double> const& solid_thermal_expansion;