There is no heating.
A tramper approaches Kahui Hut
Inside Kahui Hut
Before you go, buy 1 Standard Hut Ticket (blue for adults, yellow for youth) for each night's stay. Put this in the honesty box at the hut. Or buy a Backcountry Hut Pass that gives unlimited use at most Standard and Serviced huts for a 6 or 12 month period.
Kahui Hut is a 6 hour return walk from Kahui Road on the Kahui Track and from Puniho Road on the Puniho Track. It can also be reached from the Around the Mountain Circuit.