The actor, who has been portraying the role for over a year, revealed that Heath will face some of the most difficult challenges of his life.
Ewing told TV Week: "It's about putting a human being through some serious tests you would never put on yourself.
"The storylines coming up are very, very heavy."
Heath's current stories revolve around his desire to be part of his unborn child's life after getting Bianca Scott pregnant.
Although Bianca (Lisa Gormley) and husband Liam (Axle Whitehead) are facing a split, Ewing recently warned that Heath will not be settling down with the blonde any time soon.