They will be part of 80 Kiwis drawn from Fire and Emergency NZ, the Department of Conservation and Forestry contractors.
Nathan Sullivan has returned to Sioux Lookout and said Ontario and British Columbia posed entirely different challenges in terms of firefighting techniques, geography, and manpower.
"Fighting fire in BC is a lot like fighting fire in Australia as there is not a lot of water and a lot more hand tools are used and backburning for fuel reduction. The terrain in BC is steep with a lot of mountains and hills similar to fires in Bright, Victoria or even like Christchurch."
Temperatures, he said, in BC were between 20C and 30C during the day dropping down to 6C at night.
"Ontario fire is lot of pump and hose work as there is an abundance of water and the terrain is very flat. It was a whole different story and a new chapter in my firefighting manual I felt like I was brand new to fire again with some of the techniques used while training and the different hose lies we had to learn.
"The fires don't seem to get quite as big, averaging 0.5 to 5 hectares because of the quick response of the crews. The crews on red alert have a five-minute response time and can usually get to it quick enough.
"Ontario is quick to respond and very effective and efficient with water wrapping a fire before it gets too big. I must say it is a rush when that siren goes off and you know you only have five minutes to be ready for anywhere from less an hour to 19 days straight on the fire line," he said.
Jack Welch, fire management supervisor in Ontario, said the Sullivan brothers were doing an amazing job with other firefighters from Canada.
"In BC 90 per cent of fires are fought using helicopters as well as fixed-wing aircraft and water bombers but Nathan and Kieran are adapting very well with the intensive training they received here."
He said the 200 fires in BC were in remote areas where the indigenous communities resided and between 400 and 500 firefighters were at work.