Eight fire trucks and four support units raced to the scene early Sunday morning.
Steve Askin died when while fighting the fire in 2017.
Trampers are being urged to respect a rāhui and stay out of the Waitakere Ranges.
The investigation will only be reopened if new evidence comes to light.
The pair recovered from the wreckage of a house fire may have died before the blaze began.
Activities that were safe to do in cooler conditions could now become dangerous.
Tips to stay safe in the heat and humidity for you and your pets.
"I went outside to have a breather then saw it and was like woah."
A hedge caught alight just hours after a neighbouring church was completely wiped out.
Smoke and flames spread quickly from one of the food court kitchens at Newmarket Plaza on Saturday.