Balcatta firefighters Bryn Nightingale and Cam Cranley are featured in the calendar along with 12 of their colleagues.
Mr Nightingale, who is Mr January in the calendar, said the opportunity to help PMH Foundation to better the lives of children facing heart-breaking circumstances was humbling.
"I have my first child due in March, and a world with better medical facilities and patient care for future generations is something I would move heaven and earth to achieve," he said.
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READ NOWMr Cranley, who features as Mr May, said the calendar supported a cause he strongly believed in.
"It's a great cause and I'll do anything to help out," he said. "And it is a little bit of motivation to get fitter."
PMH Foundation chief executive Denys Pearce said the Foundation's long-standing partnership with the Perth Firefighters Calendar had been a success, raising more than $700,000 to help fund cutting-edge equipment and research at the hospital's burns unit over the past eight years.
"The burns unit cares for thousands of children from throughout WA each year, so the equipment funded by the Firefighters Calendar really does make a difference for these children, in terms of supporting their recovery," Mr Pearce said.
Calendars are available for $15 from the Volunteer's Kiosk at PMH, or online at www. pmhfoundation.com.