The 19-man team, named the Tassie Strike Team 274, consisted of 12 firefighters from the North and seven from the North-West.

Westbury Brigade Chief Rodney Brewer said the mission to the mainland was quite productive.

"We started off by doing back-burning at Taylors Arms - trying to tie in a couple of fires for three days," Mr Brewer said.

"Then we were moved to a place near Mount Killiekrankie where we put back-burns in to prevent northern fires and southern fires merging.

"We were trying to put a control line around them and add some protection."

There are about 90 fires burning in NSW currently, with nearly half of them uncontained.

About 2 million hectares has been burned with the largest fire just north of Sydney burning more than 335,000 hectares.

Mr Brewer described fire conditions in NSW as hot, demanding and very smoky.

"The locals have been fighting these for a while and have become quite exhausted," Mr Brewer said.

"Volunteers can't give up all their time ... we worked with Canadian crews as well mainly at the control centre and we worked with Parks and Forestry NSW as well."

Mr Brewer said the Tassie team's experience in fighting fires on mountainous terrain was advantageous to bushfire efforts.

"Mount Killiekrankie's 10,000-metres-high and the valleys are on 70 degree slopes if you're not used to that it's a bit different," he said.

With fires anticipated to continue in the coming weeks, according to Mr Brewer, he anticipates more teams from Tasmania will head north to help their NSW brethren.

"There will be other teams going, I think they've [NSW firefighters] requested more resources," Mr Brewer said.