It is believed they will oppose plans to publicly name recipients and seek legal advice on any contract changes.
The group, who met on Wednesday, are against publication of their details.
This is due to the negative publicity some businesses received after details of their biomass installations were made public.
The Economy Minister, Simon Hamilton, has plans which, he claims, could reduce a potential scheme overspend of hundreds of millions to "effectively zero".
His officials have already written to boiler owners giving them until next Tuesday to agree to the publication of their names.
In the letter, recipients were told the department was "minded to publish the names" in the "interests of openness and transparency".
It is understood the group will represent only those who have signed up to the scheme in good faith and are operating it legitimately.
They are writing to the Department of the Economy seeking a meeting ahead of any announcement of changes to the scheme.
The Ulster Farmers' Union (UFU) chief executive, Wesley Aston, said it was advising members who availed of the scheme not to give permission for their names to be disclosed, unless audits have been carried out of their installation.
"Without the audit, farmers risk being criticised, without being able to show they acted within the terms of the scheme," he said.
"It is up to individuals to decide whether they give permission to be named - but we fear this is not about transparency but efforts to shift the focus from those who failed to safeguard the taxpayer."
The UFU said the "vast majority" of people using the scheme were doing so "legitimately".
The RHI scheme was flawed from the start offering overgenerous subsidies over 20 years.
A spike in applications in Autumn 2015 led to an over commitment that could cost the Northern Ireland taxpayers up to £490m over 20 years.
The handling of the scandal has become a major political row that threatens to bring down Stormont.
Sinn Féin has demanded that Mrs Foster stand aside pending an investigation.
Mrs Foster has said she will not be standing down.

Dr Imran Farooq, a leader of Karachi's influential MQM party, was stabbed to death near his home in Edgware, north London in September 2010.
Khalid Shamim and Mohsin Ali were detained near the Pakistan-Afghanistan border in Chaman, Balochistan province.
They are to be handed to Pakistan's Federal Investigation Agency.
The BBC's Shahzeb Jillani in Pakistan says the murder was widely seen as a politically-motivated killing because Dr Farooq was reportedly planning to break away from the MQM leadership in London and start a new party.
The arrested suspects and a third man named Mohammed Kashif Khan Kamran worked for the MQM party, officials said.
In a statement, the MQM party denied any association with the suspects or involvement in the murder of Dr Farooq and accused the Pakistani government of political victimisation.
Dr Farooq was parliamentary leader in the Pakistani National Assembly when he went into hiding during a military operation against the MQM (Muttahida Quami Movement party) in 1992.

George Wharton, 14, and Rhy Baker, 13, died when Thomas McMeekin crashed into a tree in Morley, near Leeds, on 7 March.
The defendant and a teenage passenger were also left paralysed by the crash, Leeds Crown Court was told.
McMeekin, of Bruntcliffe Road, Morley, pleaded guilty to dangerous driving.
One witness told the hearing McMeekin had driven "like a lunatic".
He was accused of "showing off" while driving the car, which had been bought for him by his mother just five days before the crash.
The court heard he had advertised "lifts cheaper than taxis" on social media.
He will be sentenced next month.
Biomass boiler owners have formed a group to deal directly with government officials proposing changes to the controversial RHI scheme.
[NEXT_CONCEPT]
Pakistan authorities have detained two men suspected of being involved in the killing of an exiled politician in London five years ago, officials say.
[NEXT_CONCEPT]
A motorist was driving "like a lunatic" when he caused a crash which killed two teenage passengers and severely injured two others, a court heard.