Lawler said the boat was two of a kind and he was not going to be able to get the same one again.
"There goes my boat . . . the worst part is I'm not insured," Lawler said.
"That's what pisses me off the most - you always mean to do it and then something else happens and something else happens."
Lawler was recovering at his parent's home and said while he "was pretty sore" his clothing which included longs, a jacket and boots had saved him from the brunt of the burns.
But he expected his healing face would be covered in sores tomorrow, he said.
"What I don't understand is: I always turn that gas bottle off before I turn the stove off.
"I don't get why it went bang. That's what I don't get."
Lawler, who is a roofer by trade, has spent much of his life on and around boats.
"In summertime, after working you just jump in it and you just go."
He enjoyed fishing on his boat and joked that while on board it was easy to find oneself thinking: "I think I could work late tomorrow".
A Givealittle page has since been set up for Lawler by Samantha Fels, a family friend.
On the page she said the explosion was caused by an LPG leak. She said Lawler's boat was not insured and he was looking at about $10,000 to remove the wreck from the seabed.
A police spokesman said it was still working alongside fire investigators to establish what happened.
"However, initial enquiries suggest that it may have been caused by an LPG cylinder exploding", he said.
Maritime NZ was not investigating but had been in contact with the Auckland Harbourmaster.
A spokesman said after the boat's recovery, Maritime NZ would make inquiries to help explain what happened and decide if there were "any new lessons" about using gas on vessels.