Gas fueled water heater appliance having a flame arrestor

A gas fueled water heater, comprising:

• a tank for storage of water for heating;
• a chamber wall defining a combustion chamber;
• a gas burner positioned adjacent to the tank and within the combustion chamber to heat the water in the tank;
• and
• a flame arrestor positioned beneath the gas burner along a vertical direction, the flame arrestor comprising
• a bottom plate comprising an upper surface and a lower surface, the bottom plate defining a non-permeable region and a perforated region, the perforated region comprising a plurality of apertures extending through the top plate from the upper surface to the lower surface, and
• a top plate positioned above the bottom plate along the vertical direction, the top plate comprising an upper surface and a lower surface, the top plate defining a non-permeable region and a perforated region, the perforated region comprising a plurality of apertures extending through the top plate from the upper surface to the lower surface,
• wherein the perforated region of the bottom plate is axially offset from the perforated region of the top plate.