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The storage tank style of residential gas-fired water heaters is the most popular because it offers a reliable and consistent supply of hot water. This type of system works by heating water in a large tank, which can hold anywhere from 20 to 80 gallons or more, depending on the model. The water is kept at a set temperature and is readily available for use whenever needed, making it convenient for households with varying hot water demands.

Storage tank water heaters are generally less expensive upfront compared to other types, making them an accessible choice for many homeowners. Additionally, they have a well-established track record for their performance and efficiency in typical household situations. While options like tankless and heat pump water heaters have gained popularity due to their energy-saving potential and on-demand capabilities, they are often more suited for specific needs or regional preferences, thereby not achieving the widespread usage seen with storage tank models.

The popularity of the storage tank style also stems from its simplicity in design and installation, which aligns with many homeowners' requirements for straightforward solutions in their hot water systems.