diff --git a/src/opm/output/eclipse/Summary.cpp b/src/opm/output/eclipse/Summary.cpp
index 6ed7ef06e..bdffafa4c 100644
--- a/src/opm/output/eclipse/Summary.cpp
+++ b/src/opm/output/eclipse/Summary.cpp
@@ -722,11 +722,11 @@ inline quantity potential_rate( const fn_args& args ) {
 
         if (sched_well.isInjector() && outputInjector) {
 	    const auto v = args.wells.at(name).rates.get(phase, 0.0);
-	    sum += v;
+	    sum += v * efac(args.eff_factors, name);
 	}
 	else if (sched_well.isProducer() && outputProducer) {
 	    const auto v = args.wells.at(name).rates.get(phase, 0.0);
-	    sum += v;
+	    sum += v * efac(args.eff_factors, name);
 	}
     }
 
diff --git a/tests/SUMMARY_EFF_FAC.DATA b/tests/SUMMARY_EFF_FAC.DATA
index 3c22f681f..8373018c0 100644
--- a/tests/SUMMARY_EFF_FAC.DATA
+++ b/tests/SUMMARY_EFF_FAC.DATA
@@ -88,6 +88,17 @@ GWCT
 GGOR
 /
 
+GOPP
+/
+GWPP
+/
+GGPP
+/
+GGPI
+/
+GWPI
+/
+
 FOPR
 
 FOPT
@@ -96,6 +107,12 @@ FOIR
 
 FOIT
 
+FOPP
+FWPP
+FGPP
+FGPI
+FWPI
+
 COPR
 'W_2' /
 /
diff --git a/tests/test_Summary.cpp b/tests/test_Summary.cpp
index c592074a4..2313d0125 100644
--- a/tests/test_Summary.cpp
+++ b/tests/test_Summary.cpp
@@ -1579,6 +1579,31 @@ BOOST_AUTO_TEST_CASE(READ_WRITE_WELLDATA) {
             BOOST_CHECK_MESSAGE(curr.inj == ::Opm::Well::InjectorCMode::GRUP, "W_6 must be on GRUP control");
 }
 
+// Well/group tree structure (SUMMARY_EFF_FAC.DATA):
+//
+//    W* are wells, G* are groups.
+//
+//                         +-------+
+//                         | FIELD |
+//                         +---+---+
+//                             |
+//                  +----------+-----------------+
+//                  |                            |
+//             +----+---+                   +----+---+
+//             |    G   |                   |   G_4  |
+//             +----+---+                   +----+---+
+//                  |                            |
+//         +--------+----------+            +----+---+
+//         |                   |            |   G_3  |
+//    +----+---+          +----+---+        +----+---+
+//    |   G_1  |          |   G_2  |             |
+//    +----+---+          +----+---+        +----+---+
+//         |                   |            |   W_3  |
+//    +----+---+          +----+---+        +----+---+
+//    |   W_1  |          |   W_2  |
+//    +----+---+          +----+---+
+//
+
 BOOST_AUTO_TEST_CASE(efficiency_factor) {
         setup cfg( "test_efficiency_factor", "SUMMARY_EFF_FAC.DATA" );
 
@@ -1599,12 +1624,48 @@ BOOST_AUTO_TEST_CASE(efficiency_factor) {
         BOOST_CHECK_CLOSE( 10.1, ecl_sum_get_well_var( resp, 1, "W_1", "WOPT" ), 1e-5 );
         BOOST_CHECK_CLOSE( 2 * 10.1, ecl_sum_get_well_var( resp, 2, "W_1", "WOPT" ), 1e-5 );
 
+        BOOST_CHECK_CLOSE( -10.13, ecl_sum_get_group_var( resp, 1, "G_1", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.14, ecl_sum_get_group_var( resp, 1, "G_1", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.15, ecl_sum_get_group_var( resp, 1, "G_1", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0 , ecl_sum_get_group_var( resp, 1, "G_1", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0 , ecl_sum_get_group_var( resp, 1, "G_1", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( -10.13, ecl_sum_get_group_var( resp, 2, "G_1", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.14, ecl_sum_get_group_var( resp, 2, "G_1", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.15, ecl_sum_get_group_var( resp, 2, "G_1", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0 , ecl_sum_get_group_var( resp, 2, "G_1", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0 , ecl_sum_get_group_var( resp, 2, "G_1", "GGPI" ), 1e-5 );
+
         /* WEFAC 0.2 assigned to W_2.
          * W_2 assigned to group G2. GEFAC G2 = 0.01 */
         BOOST_CHECK_CLOSE( 20.1, ecl_sum_get_well_var( resp, 1, "W_2", "WOPR" ), 1e-5 );
         BOOST_CHECK_CLOSE( 20.1 * 0.2 * 0.01, ecl_sum_get_well_var( resp, 1, "W_2", "WOPT" ), 1e-5 );
         BOOST_CHECK_CLOSE( 2 * 20.1 * 0.2 * 0.01, ecl_sum_get_well_var( resp, 2, "W_2", "WOPT" ), 1e-5 );
 
+        BOOST_CHECK_CLOSE( -20.13 * 0.2, ecl_sum_get_group_var( resp, 1, "G_2", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -20.14 * 0.2, ecl_sum_get_group_var( resp, 1, "G_2", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -20.15 * 0.2, ecl_sum_get_group_var( resp, 1, "G_2", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0       , ecl_sum_get_group_var( resp, 1, "G_2", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0       , ecl_sum_get_group_var( resp, 1, "G_2", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( -10.13 - (20.13 * 0.2 * 0.01), ecl_sum_get_group_var( resp, 1, "G", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.14 - (20.14 * 0.2 * 0.01), ecl_sum_get_group_var( resp, 1, "G", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.15 - (20.15 * 0.2 * 0.01), ecl_sum_get_group_var( resp, 1, "G", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0                        , ecl_sum_get_group_var( resp, 1, "G", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0                        , ecl_sum_get_group_var( resp, 1, "G", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( -20.13 * 0.2, ecl_sum_get_group_var( resp, 2, "G_2", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -20.14 * 0.2, ecl_sum_get_group_var( resp, 2, "G_2", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -20.15 * 0.2, ecl_sum_get_group_var( resp, 2, "G_2", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0       , ecl_sum_get_group_var( resp, 2, "G_2", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0       , ecl_sum_get_group_var( resp, 2, "G_2", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( -10.13 - (20.13 * 0.2 * 0.01), ecl_sum_get_group_var( resp, 2, "G", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.14 - (20.14 * 0.2 * 0.01), ecl_sum_get_group_var( resp, 2, "G", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( -10.15 - (20.15 * 0.2 * 0.01), ecl_sum_get_group_var( resp, 2, "G", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0                        , ecl_sum_get_group_var( resp, 2, "G", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(   0.0                        , ecl_sum_get_group_var( resp, 2, "G", "GGPI" ), 1e-5 );
+
         /* WEFAC 0.3 assigned to W_3.
          * W_3 assigned to group G3. GEFAC G_3 = 0.02
          * G_3 assigned to group G4. GEFAC G_4 = 0.03*/
@@ -1612,6 +1673,54 @@ BOOST_AUTO_TEST_CASE(efficiency_factor) {
         BOOST_CHECK_CLOSE( 30.1 * 0.3 * 0.02 * 0.03, ecl_sum_get_well_var( resp, 1, "W_3", "WOIT" ), 1e-5 );
         BOOST_CHECK_CLOSE( 30.1 * 0.3 * 0.02 * 0.03 + 30.1 * 0.3 * 0.02 * 0.04, ecl_sum_get_well_var( resp, 2, "W_3", "WOIT" ), 1e-5 );
 
+        BOOST_CHECK_CLOSE( 30.13 * 0.3, ecl_sum_get_group_var( resp, 1, "G_3", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.14 * 0.3, ecl_sum_get_group_var( resp, 1, "G_3", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.15 * 0.3, ecl_sum_get_group_var( resp, 1, "G_3", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0       , ecl_sum_get_group_var( resp, 1, "G_3", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0       , ecl_sum_get_group_var( resp, 1, "G_3", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( 30.13 * 0.3 * 0.02, ecl_sum_get_group_var( resp, 1, "G_4", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.14 * 0.3 * 0.02, ecl_sum_get_group_var( resp, 1, "G_4", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.15 * 0.3 * 0.02, ecl_sum_get_group_var( resp, 1, "G_4", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0              , ecl_sum_get_group_var( resp, 1, "G_4", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0              , ecl_sum_get_group_var( resp, 1, "G_4", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( 30.13 * 0.3, ecl_sum_get_group_var( resp, 2, "G_3", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.14 * 0.3, ecl_sum_get_group_var( resp, 2, "G_3", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.15 * 0.3, ecl_sum_get_group_var( resp, 2, "G_3", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0       , ecl_sum_get_group_var( resp, 2, "G_3", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0       , ecl_sum_get_group_var( resp, 2, "G_3", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( 30.13 * 0.3 * 0.02, ecl_sum_get_group_var( resp, 2, "G_4", "GWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.14 * 0.3 * 0.02, ecl_sum_get_group_var( resp, 2, "G_4", "GOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 30.15 * 0.3 * 0.02, ecl_sum_get_group_var( resp, 2, "G_4", "GGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0              , ecl_sum_get_group_var( resp, 2, "G_4", "GWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE(  0.0              , ecl_sum_get_group_var( resp, 2, "G_4", "GGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( - 10.13
+                           - (20.13 * 0.2 * 0.01)
+                           + (30.13 * 0.3 * 0.02)*0.03, ecl_sum_get_field_var( resp, 1, "FWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( - 10.14
+                           - (20.14 * 0.2 * 0.01)
+                           + (30.14 * 0.3 * 0.02)*0.03, ecl_sum_get_field_var( resp, 1, "FOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( - 10.15
+                           - (20.15 * 0.2 * 0.01)
+                           + (30.15 * 0.3 * 0.02)*0.03, ecl_sum_get_field_var( resp, 1, "FGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 0.0                        , ecl_sum_get_field_var( resp, 1, "FWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 0.0                        , ecl_sum_get_field_var( resp, 1, "FGPI" ), 1e-5 );
+
+        BOOST_CHECK_CLOSE( - 10.13
+                           - (20.13 * 0.2 * 0.01)
+                           + (30.13 * 0.3 * 0.02)*0.04, ecl_sum_get_field_var( resp, 2, "FWPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( - 10.14
+                           - (20.14 * 0.2 * 0.01)
+                           + (30.14 * 0.3 * 0.02)*0.04, ecl_sum_get_field_var( resp, 2, "FOPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( - 10.15
+                           - (20.15 * 0.2 * 0.01)
+                           + (30.15 * 0.3 * 0.02)*0.04, ecl_sum_get_field_var( resp, 2, "FGPP" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 0.0                        , ecl_sum_get_field_var( resp, 2, "FWPI" ), 1e-5 );
+        BOOST_CHECK_CLOSE( 0.0                        , ecl_sum_get_field_var( resp, 2, "FGPI" ), 1e-5 );
+
         /* WEFAC 0.2 assigned to W_2.
          * W_2 assigned to group G2. GEFAC G2 = 0.01 */
         BOOST_CHECK_CLOSE( 20.1 * 0.2, ecl_sum_get_group_var( resp, 1, "G_2", "GOPR" ), 1e-5 );