I contacted the heating and A/C repair company when there was no hot water in the house.
I do not know the first thing about fixing these problems.
I tried to call the plumbing service, however they did not have any suppliers available. I knew that the heating and A/C repair service handled some boiling water furnace problems too so I gave them a call, however they had a worker ready to go and at our place in less than an hour. The young worker looked just like my oldest son, however he had orange hair and freckles and a funny smile. The kid looked like he was 18 or 19 years old. He was wearing a ceremony ring. I made some small talk with the kid while he inspected the hot water heater. I tried not to get in his way, but I was trying to be friendly, but when the guy went out to his truck for parts, I excused myself to go into the house and I did not come back out until the guy was almost finished with the boiling water furnace repair. The repair worker pointed out a strange sound coming from the furnace and he told me that I should have that looked at. He could not do the evaluation and repair until the next day, but he was certain that he could service the issue in about 30 minutes if it was the problem that he thought. The technician did not know that the furnace repair was going to be as involved or expensive as the repair to the hot water heater.