Here is a link to all the Thermal Hot pools and Hot Springs in NZ. You can buy the book online as well.

New Zealand's thermal pools may contain minuscule amounts of a type of amoeba that causes amoebic meningitis. However, it can only enter through the ears and nose, so keep your head above the water and don't jump or dive into thermal pools.

Thermal Hot Pools

http://www.alpinepacifictourism.co.nz... 

Hanmer Springs near Christchurch - The variety of thermal pools here ensures there is something for everyone and includes sulphur and rock pools that range in temperature from 34˚ - 42˚C. Children are catered for with a family activity pool and waterslides.