It does say that he was taken, but how do you know is was to Heaven?
The words of the gospel of John are very specific.
2 Kings 2:11 And it came to pass, as they still went on, and talked, that, behold, there appeared a chariot of fire, and horses of fire, and parted them both asunder; and Elijah went up by a whirlwind into heaven (shamayim).
shamayim - Definition: heaven [http://biblehub.com/hebrew/behashshamayim_8064.htm]
>>The words of the gospel of John are very specific.<<
Yes it is. In fact the form of the Greek word used for the ascension of Jesus is only used once in scripture. Only Jesus has "ascended" into heaven. Elijah was "taken up".