One morning I woke up to find that there was no tepid water.
There was an ample amount of cold water, however this was in the middle of winter, so the water from the tap was actually too cold. I sensed that the pipes were on the verge of chilly, so I turned all the taps on just a little bit, to let a tiny amount of water flow. This is the only way I guess to keep pipes from chilly solid, and if that happens then they usually rupture and need to be updated. I am not an expert when it comes to water heaters, however I guess enough to check the fuel supply and the pilot light; Neither of those were the culprit, so I called a local Heating, Ventilation, and A/C supplier that provided 24/7 emergency water gas furnace services. If this was just about my own comfort or being able to take a tepid shower I would have waited, however I knew a faulty water gas furnace could lead to a host of other concerns. The Heating, Ventilation, and A/C tech arrived looking just as tired as I felt, but on the plus side, she was able to suss out the issue with the water gas furnace within a few minutes, however on the downside side, it wasn’t something she could fix, my water gas furnace is connected to the natural gas pipes operated by the utility supplier. It turns out the supplier had an issue with the natural gas lines, so the problem wasn’t with my water heater, it was a lack of natural gas!