Emergency services have expanded an evacuation order on communities threatened by bushfire at Deepwater in central Queensland, with State Emergency Service (SES) volunteers knocking on doors to tell people to leave their homes in Baffle Creek, Oyster Creek and Rules Beach.

Key points: Hundreds of homes at Deepwater, Baffle Creek and Agnes Water have been evacuated

Hundreds of homes at Deepwater, Baffle Creek and Agnes Water have been evacuated SES doorknocking in Baffle Creek, Oyster Creek, Rules Beach urging people to leave

SES doorknocking in Baffle Creek, Oyster Creek, Rules Beach urging people to leave Authorities warn unprecedented fire conditions will worsen on Tuesday

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The State Government has enacted a disaster declaration for the Gladstone area, meaning emergency services could force people to move or stay from areas, amid warnings the fire threat is set to intensify on Tuesday.

The regions affected include Baffle Creek, Wartburg, Deepwater, Agnes Water, Round Hill, Miriam Vale and Bororen.

The move came after emergency services pleaded with residents to heed all warnings over coming days amid "unprecedented" weather conditions fanning the flames.

Two homes were lost and at least four others damaged as hundreds of residents fled their properties amid a dangerous bushfire north of Bundaberg.

Queensland Fire and Emergency Services (QFES) said dry, windy conditions at Deepwater had caused the bushfire to flare up again on Monday, with more than 17,000 hectares now burnt out by a fire front about 60 kilometres long.

All residents north of Pacific Drive, near Wartburg, were told to leave and remain outside of the area.

By Monday afternoon, there were 100 firefighters on the ground, with 100 more arriving from New South Wales on Tuesday to join the battle.

Among six waterbombing aircraft was a Boeing 737 aerial tanker that can dump 15,000 litres of water at a time.

Residents may not be able to return home for at least three to four days, as an "extreme heatwave" is predicted for central and northern Queensland this week.

Authorities remain extremely concerned by the fire threat, with conditions set to worsen on Tuesday including changing wind direction, high temperatures and low humidity.

Premier Annastacia Palaszczuk said the conditions were worse than what the state experienced in 2009.

"We really need people to listen to the authorities, especially the emergency services staff, because people's lives will be at risk if they do not listen," she said.

"We've got temperatures in our state between six and 10 degrees higher than we've ever seen before at this time of year.

An aerial water bomber over Deepwater National Park on Monday. ( Facebook: Alex Frost )

"We also have large westerlies coming through, we expect dust storms later on in the week and some thunderstorms that may not actually bring rain.

"We have more than 70 wildfires throughout our state."

QFES commissioner Katarina Carroll said the combination of high temperatures, low humidity and variable winds made it extremely difficult for crews.

"In this part of the world we have not experienced these conditions before," Commissioner Carroll said.

"This will continue over the next several days. as has been mentioned, some 17,000 hectares has already been burned, and the perimeter is 66 kilometres," she said.

Sorry, this video has expired Video shows charred remains of Queensland bushfires

"The next seven days are extremely concerning for us. I ask everyone to listen to authorities and heed the warnings and to date — thankfully there has been no recorded injuries."

'Another five minutes, we would've been dead'

Debra and Bob Wait said they feared for their lives as they fled their Deepwater Road property with their two dogs, leaving behind 13 horses, cattle and poultry.

Debra and Bob Wait said it was raining ash as they fled their property in Deepwater. ( ABC News: Emilia Terzon )

"We didn't think we were going to get out — I reckon another five minutes and we would've been dead because we couldn't breathe," Ms Wait said.

"We filled our gutters up with water, grabbed some stuff and threw it in the van and the car, and then [the fire] just came in.

"It burnt all the hairs off my arms when I raced down the paddock to let other horses out — it was just raining little white pieces of ash."

Mr Wait said he feared for his neighbour, whose home was believed to have been lost in the blaze.

Water cartage trucks and QFES on scene at Deepwater. ( Facebook: Leslie Cullen )

Sorry, this video has expired Water truck driver surveys bushfire damage in Deepwater (Facebook: Leslie Cullen)