The firm called the fire service to act as a back-up while a gas engineer dug through to the supply pipe and clamped it off.
A couple living about 250m away, and in the wind flow direction, said they smelled gas and a short time later heard the fire sirens.
"I was going to go for a walk down there but that's off for now," one woman said.
Firefighters blocked the road and a crew sprayed a fine mist of water in the direction of the leaking meter box while the engineer got to the 25mm pipe about a metre away on the footpath.
Mr Smith stayed put at the foot of the road behind the barriers until the pipe, hissing loudly, was closed off about 20 minutes later.
"I didn't expect to see all these fire guys turn up," he said.
Engineers said the repairs to the meter box would be wrapped up by the end of the day, and Mr Smith would have his hot water back on.