Just curious whether anyone has any opinions as to the best residential hot water heater available.  The project I am working on would utilize a a gas tank-type (not tankless) hot water heater.  Debating between 50 and 75 gallon.  I like the fact that the 50 gallon models areequipped with new “flame arrestor” safety technology. This technology prevents flashback fires by trapping and burning dangerous gas vapors inside of the heater, while preventing ignition of the vapors in the room.  Does anyone make a 75 gallon tank with the flame arrestor feature?

Thanks for your input.