A double-strapped water heater is a type of water heater that features two straps secured around its sides to provide additional support and stability. This design enhances the durability and longevity of the water heater, especially in areas prone to earthquakes or other seismic activities. The straps help prevent the water heater from toppling over or sustaining damage during sudden movements. These heaters are commonly found in commercial and industrial settings where reliability and safety are crucial.