diff --git a/redisson/src/main/java/org/redisson/api/RScoredSortedSetReactive.java b/redisson/src/main/java/org/redisson/api/RScoredSortedSetReactive.java
index 11ea2e90a..c6fc59a52 100644
--- a/redisson/src/main/java/org/redisson/api/RScoredSortedSetReactive.java
+++ b/redisson/src/main/java/org/redisson/api/RScoredSortedSetReactive.java
@@ -695,6 +695,45 @@ public interface RScoredSortedSetReactive<V> extends RExpirableReactive, RSortab
      */
     Mono<Integer> union(Aggregate aggregate, Map<String, Double> nameWithWeight);
 
+    /**
+     * Union ScoredSortedSets specified by name with current ScoredSortedSet
+     * without state change.
+     *
+     * @param names - names of ScoredSortedSet
+     * @return length of union
+     */
+    Mono<Collection<V>> readUnion(String... names);
+
+    /**
+     * Union ScoredSortedSets specified by name with defined aggregation method
+     * and current ScoredSortedSet without state change.
+     *
+     * @param aggregate - score aggregation mode
+     * @param names - names of ScoredSortedSet
+     * @return length of union
+     */
+    Mono<Collection<V>> readUnion(Aggregate aggregate, String... names);
+
+    /**
+     * Union provided ScoredSortedSets mapped to weight multiplier
+     * and current ScoredSortedSet without state change.
+     *
+     * @param nameWithWeight - name of ScoredSortedSet mapped to weight multiplier
+     * @return length of union
+     */
+    Mono<Collection<V>> readUnion(Map<String, Double> nameWithWeight);
+
+    /**
+     * Union provided ScoredSortedSets mapped to weight multiplier
+     * with defined aggregation method
+     * and current ScoredSortedSet without state change
+     *
+     * @param aggregate - score aggregation mode
+     * @param nameWithWeight - name of ScoredSortedSet mapped to weight multiplier
+     * @return length of union
+     */
+    Mono<Collection<V>> readUnion(Aggregate aggregate, Map<String, Double> nameWithWeight);
+
     /**
      * Removes and returns the head element waiting if necessary for an element to become available.
      *
diff --git a/redisson/src/main/java/org/redisson/api/RScoredSortedSetRx.java b/redisson/src/main/java/org/redisson/api/RScoredSortedSetRx.java
index 3c69cb577..c4e7cd0f2 100644
--- a/redisson/src/main/java/org/redisson/api/RScoredSortedSetRx.java
+++ b/redisson/src/main/java/org/redisson/api/RScoredSortedSetRx.java
@@ -697,6 +697,45 @@ public interface RScoredSortedSetRx<V> extends RExpirableRx, RSortableRx<Set<V>>
      */
     Single<Integer> union(Aggregate aggregate, Map<String, Double> nameWithWeight);
 
+    /**
+     * Union ScoredSortedSets specified by name with current ScoredSortedSet
+     * without state change.
+     *
+     * @param names - names of ScoredSortedSet
+     * @return length of union
+     */
+    Single<Collection<V>> readUnion(String... names);
+
+    /**
+     * Union ScoredSortedSets specified by name with defined aggregation method
+     * and current ScoredSortedSet without state change.
+     *
+     * @param aggregate - score aggregation mode
+     * @param names - names of ScoredSortedSet
+     * @return length of union
+     */
+    Single<Collection<V>> readUnion(Aggregate aggregate, String... names);
+
+    /**
+     * Union provided ScoredSortedSets mapped to weight multiplier
+     * and current ScoredSortedSet without state change.
+     *
+     * @param nameWithWeight - name of ScoredSortedSet mapped to weight multiplier
+     * @return length of union
+     */
+    Single<Collection<V>> readUnion(Map<String, Double> nameWithWeight);
+
+    /**
+     * Union provided ScoredSortedSets mapped to weight multiplier
+     * with defined aggregation method
+     * and current ScoredSortedSet without state change
+     *
+     * @param aggregate - score aggregation mode
+     * @param nameWithWeight - name of ScoredSortedSet mapped to weight multiplier
+     * @return length of union
+     */
+    Single<Collection<V>> readUnion(Aggregate aggregate, Map<String, Double> nameWithWeight);
+
     /**
      * Removes and returns the head element waiting if necessary for an element to become available.
      *