The two single-toilet Exeloo units cost approximately $176,000 for site works and installation.
One unit was installed at the park next to the pissoir, and the other was already in use at Kuripuni.
Mayor Garry Daniell said it was great to finally see the historic cast-iron pissoir open.
He said it fitted well in its location near a historic lamp post, the fountain and Hoskings Garden, which all had a "Edwardian" feel.
He was satisfied the area had a good coverage of public toilet facilities.
Mr Daniell said the toilets had been a point of controversy for some time. "It's really good to see them finished."
Assets and operations manager David Hopman said the old toilet block would be closed permanently next week, and eventually demolished to allow more access to the park.