1 Breakages are less as the boards are much tougher and have fibers reinforcing in them. 2  they damage less easy from general wear and tear in everyday use in a home or office. 3  It offers slightly better acoustics than standard board.  It is a superior product in case of fire.
It is normal for the solenoid to make noise, it clicks when the valve is turned on or off. It also is normal for a very soft buzzing sound to be heard when the valve is activated, but you should not be able to hear it unless you put your ear near it. If you can easily hear it buzzing, that is not normal.
Sometimes power vented gas water heaters make noises when the light, or the fan makes noise, these will usually be a sign that you are soon going to have reliability problems. Iâd take a look and see if those 2 minor problems are what is going on and just see if you can see what is going on.