They work up to 15 hours each day, in temperatures as high as 43 degrees Celsius, but the chance to help fire-ravaged communities halfway around the globe makes it all worth it, New Zealand Defence Force firefighters helping battle wildfires in North America say.

Nine NZDF firefighters are part of New Zealand contingents sent to help battle the massive fires in the United States and Canada.

'Our day starts at 5.30am and we would be working at the fire line up to 11 hours and not get back to camp until 8.30pm,” says Sergeant Alex Walker, who is leading the three-member NZDF team in the United States.

'It's difficult, challenging work and the tasks vary each day. Sometimes it is holding a fire line, at times it is patrolling the perimeter of the fire.”

Cal Fire, California's firefighting agency, appointed the NZDF firefighters deployed earlier this month to the United States as task force leaders.

Each of them are managing between 60 and 100 firefighters trying to suppress the Carr Fire, which has burned more than 207,000 acres and destroyed about 1000 homes so far.

Although the days may be long and hot, Sergeant Walker says the gratitude shown by the locals was more than enough reward.

Senior Firefighter Tony Morris is one of three New Zealand Defence Force firefighters helping battle wildfires at Revelstoke, a city in south-eastern British Columbia in Canada. Three more are in Castlegar, Canada.

'When we stop at the petrol station, people ask us where we are from and they are amazed when we tell them that we're from New Zealand.

'They shake our hands and could not thank us enough for coming halfway around the world to help.”

The NZDF deployed six other firefighters to help combat the wildfires raging across British Columbia in Canada.

Sergeant Michael Scott, who is heading the NZDF team in Canada, says the fires they were dealing with were bigger and more dangerous than they had encountered in New Zealand.

'Cedars are massive and when they burn they are like giant chimneys, which can be quite dangerous,” says NZDF Senior Firefighter Corporal Tony Morris, who is helping battle wildfires at Revelstoke, a city in south-eastern British Columbia.

'It has been full-on and pretty tiring. But it's been very rewarding. We've all learnt a great deal and it's all worth it.”

Corporal Thomas Grant supervises American firefighters who are hot-spotting and felling trees as they help battle the Carr Fire in northern California.

Although there is not much difference in the way firefighters in Canada and the United States operate, the New Zealand firefighters had to be briefed on how to deal with bears and other wild animals.

'There are bears, wolves and cougars in the areas where we are operating and we were told that if we encounter them we should make as much noise as possible and make ourselves look as big as we can and back away,” says Sergeant Scott.

'We work in pairs and we have whistles on our shirts, but fortunately we have not had to use them yet.”

Sergeant Alex Walker is leading the three-member New Zealand Defence Force firefighting team helping battle the Carr Fire in northern California.