The prime minister has announced a national recovery fund for the devastating bushfires ravaging the country.

An additional $2 billion over two years will be made available to support bushfire recovery efforts and rebuild the towns decimated by the crisis, Scott Morrison said on Monday.

"If further funds are required, further funds will be provided," he said.

On Saturday, the prime minister announced up to 3000 army reservists and an extra naval ship will join bushfire disaster and recovery efforts.

Four extra firefighting planes will also be leased to tackle the blazes, Morrison said.

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As of January 6, at least 22 people are dead and more than 1700 homes have been destroyed as fires continue to burn through more than six-million hectares of land across the country.

Cooler weather has brought some relief to Victoria and NSW, with showers expected to give firefighters some respite before the heat returns later in the week.