Lachie with his fiancée Bri Thompson in happier times(Image: GoFundMe)

A man has been left fighting for his life in hospital after his robot vacuum cleaner malfunctioned and exploded, triggering a housefire that has left him with burns on 75 per cent of his body.

Lachie Perrem, 25, was severely injured in the horror blaze that razed his home in Perth, Australia, last Thursday (July 2) evening. First responders were called to the home in Brabham amid reports of a fire, with paramedics rushing an injured Lachie to the nearby Fiona Stanley Hospital in Perth.

He has remained in the burns unit under sedation as doctors fight to save his life, with the 25-year-old already undergoing a multitude of surgeries after the shock incident.

His family, friends, and loved ones have been left reeling in the wake of last week's horror house fire, with Lachie's fiancée Bri Thompson described the days since as “completely unimaginable”.

A robot vaccum cleaner (file image)

“Our entire life has changed in a matter of moments and everything has been incredibly intense and overwhelming,” she said.

“Lachie has an incredibly long road ahead of him, and right now all we want is for him to keep fighting.”

Lachie's mother, Fiona, lives on the other side of the country and is making plans to travel to Western Australia on Tuesday so she can be by her son's bedside as he recovers.

Lachie Perrem was severely injured after a vacuum exploded(Image: 7News)

“Our family has been turned upside down after my beloved son was critically injured in a tragic explosion at his home,” Fiona Perrem said, as per 7News.

“While our focus is on helping him survive and heal, life outside the hospital doesn’t stop. We want to ease as much of that burden as possible so that, when he wakes and begins his recovery, he can focus entirely on getting better.”

Lachie expected to remain in hospital for at least the next two months.

Lachie in hospital (L) and charred walls of his home after the fire (R)(Image: 7NEWS)

Video taken at the scene, captured by 7News, has shown just how fierce the fire was. Footage show singed and blackened walls in both the kitchen and the lounge, where the fire spread before fire crews were able to extinguish the blaze.

Building and energy inspectors are now investigating the cause of the fire, as well as the appliance they believe as the item responsible for starting the blaze.

Firefighters told news.com.au that the fire was triggered by an explosion after an "accidental due to a fault in a robotic vacuum cleaner".

"The device has been sent to Department of Local Government, Industry Regulation and Safety (LGIRS) for further investigation," a Department of Fire and Emergency Services said.

An online fundraiser has been set up to help during his recovery, with nearly £11,400 raised so far to help Lachie in his recovery.

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