Although the police have said they are not bringing manslaughter charges against Sunlight, the company could still face further action. The Health and Safety Executive is considering a prosecution and Mr Clegg's family is now set to launch a civil action for negilgence.
Paul Clegg, 23, climbed into the 42ft-long tunnel washer at the Sunlight laundry to try and clear a blockage, but collapsed when he was overcome by the intense heat.
Colleagues were unable to free him because they were not aware there was a safety hatch in the side of the Voss continuous washer, which has a top temperature of 75C.
Mr Clegg spent nearly three hours trapped under the mechanical workings inside the unit until firefighters managed to cut a hole in it to reach him.
By that time he had suffered a fatal heart attack after his body temperature soared above the normal level of 37C.
The inquest was told that staff at the Winton depot were not trained in procedures for entering the tunnel washers.
Health and safety guidelines say the washer should have been flushed with cool water and the air temperature should not have exceeded 30C before Mr Clegg climbed into the machine.
A post mortem examination revealed that he died from heart failure brought on by hyperthermia - the opposite of hypothermia.
Pathologist Dr David Parham said a burn on Mr Clegg's hip suggested the temperature inside the machine was at least 50C.
James McGuirk, chief engineer at Sunlight, said there were no safety procedures in place for staff to follow when they entered the washer, and even he was not aware of the escape hatch.
He said: "We made sure the machine was isolated and we used common sense. If someone went in and it was too hot they came out again until it cooled down."
And he added: "I looked at the manual many times but I cannot recollect it showing an inspection panel."
John Brayford, Sunlight Service Group's engineering director, said the machine had been installed in 2000 and the manufacturer's guidelines had been sent to the firm.
Mr Brayford said it took the machine an hour to fully cool down when loaded with linen and he admitted there had been no formal training for staff on how to enter the machine.
When asked if he had known about the access panel on the side, Mr Brayford said that he did but that he had "no idea" why workers at the site did not.
Detective chief inspector Neil Redstone of Dorset CID said the company had been negligent in not complying with health and safety requirements - but not grossly negligent.
He added: "It is clear that other people who had previously climbed into the machine did not complain of the heat and on the day he died there were engineers on site who did not have any concern as to what he was doing.
In a statement issued by the family, Paul Clegg's mother Susan said: "We do not know how such an accident was allowed to happen, but we believe it was an accident waiting to happen.
"We feel very unhappy and appalled that not one member of the management or engineering staff knew about the escape hatch.
"Such negligence bewilders us, as a lot of time could have been saved - and maybe Paul's life too."
