His younger brother, however, had more success with his Mount Maunganui team spectacularly dominant in defending their overall ERC club title.
Mount finished on 223 points, with Piha second on 90.
The host club's dominance was widespread, although club coach John Bryant gained plenty of satisfaction from the open ironwoman win by Jess Miller.
The 18-year-old recently moved to Australia to train with the Northcliffe club, although she was particularly proud of winning her first open ironman title on home sand, especially after several other results did not go her way.
"I was leading the run-swim-run by quite a bit and turned around to see four girls come down a wave and catch me," Miller said.
"That was pretty gutting - then I had a terrible start in the under-19 ironwoman.
But training with the Northcliffe girls has been amazing - they are the best in Australia and probably the world so it's really good to compare myself against them."
Other notable performers included world champion kayaker Teneale Hatton (Piha), who dominated the women's ski race, while another New Zealand kayaking star Scott Bicknell (Ocean Beach Kiwi) won the men's ski race.
Mount Maunganui's Olivia Eaton comfortably won the women's beach sprint. Mairangi Bay's Jake Hurley celebrated his 18th birthday in style by winning the open men's beach sprint and the under-19 men's flags.