17
CHAPTER
Gas Water Heaters
Gas water heaters are similar to electric water heaters, with the exception of how the water is heated. They use liquefied petroleum gas (LP or LPG) or natural gas to heat the water. The tank is constructed in such a way that it allows for a vent (chimney) up the middle of the tank, along with a gas burner on the bottom of the tank to heat the water (Figure 17-1). The thermostat that controls the water temperature and gas flow is mounted on the outside of the tank, with the temperature probes inserted into the tank to sense the water temperature. A temperature and pressure-relief valve, which is mounted on the outside of the tank, is a device applied to a water heater that will open to pass water or steam if excessive ...
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