"No day is perfect. But overall you have to be consistent over all three disciplines which I did today and really it was a very pleasing performance.
"It sets my year off on a very positive note and that is very exciting."
Second place went to Lucy Gossage (Great Britain) in a time of 9h 5m 8s, while Australian Carrie Lester finished third in 9h 7m 19s. Michelle Bremer was the best of the Bay of Plenty athletes, finishing sixth in the women's race.
Kessler said when it gets tough on the course she tried to think of people who would love to be in her position and it drove her forward: "I just think about people who can't. And people who want to do what we are doing and maybe they are injured or disabled and not able to, and that motivates me."