diff --git a/ProcessLib/HeatTransportBHE/BHE/BHE_1U.h b/ProcessLib/HeatTransportBHE/BHE/BHE_1U.h
index 6a0dce99b12efd75b4393e767af6e585f0f45cad..5e38eb0ead9efe01746dc9d43961b1d9e6ee6725 100644
--- a/ProcessLib/HeatTransportBHE/BHE/BHE_1U.h
+++ b/ProcessLib/HeatTransportBHE/BHE/BHE_1U.h
@@ -167,9 +167,6 @@ private:
     /// 1) Diersch (2013) FEFLOW book on page 958, M.3, or
     /// 2) Diersch (2011) Comp & Geosci 37:1122-1135, Eq. 90-97.
     std::array<double, number_of_unknowns> _thermal_resistances;
-
-    /// Flow velocity inside the pipes. Depends on the flow_rate.
-    double _flow_velocity;
 };
 }  // namespace BHE
 }  // namespace HeatTransportBHE
diff --git a/ProcessLib/HeatTransportBHE/BHE/BHE_2U.h b/ProcessLib/HeatTransportBHE/BHE/BHE_2U.h
index c313b767021d11d2f6160a0b2f20259c7b87a569..cf43667bc1846f000268a3a87753859c13da665d 100644
--- a/ProcessLib/HeatTransportBHE/BHE/BHE_2U.h
+++ b/ProcessLib/HeatTransportBHE/BHE/BHE_2U.h
@@ -230,9 +230,6 @@ private:
     /// 1) Diersch (2013) FEFLOW book on page 958, M.3, or
     /// 2) Diersch (2011) Comp & Geosci 37:1122-1135, Eq. 90-97.
     std::array<double, number_of_unknowns> _thermal_resistances;
-
-    /// Flow velocity inside the pipes. Depends on the flow_rate.
-    double _flow_velocity;
 };
 }  // namespace BHE
 }  // namespace HeatTransportBHE