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There is no problem with the screws, the problem is the hollow wall, if your wall screws are through both sides of the wall, you can ensure that the water heater will not fall off, if it is just a general expansion screw, change it quickly.
Hollow bricks can be considered with aircraft expansion screws.
It is recommended to install a bracket above 60 liters, which is safe. Load-bearing walls of hollow bricks? Doing the bracket does not affect the appearance, the machine is larger than the bracket and is blocked.
This should be a description in the drawing, which is not in the specification.
If it is 1 meter for the sake of aesthetics, it is installed in the center of the 1 meter for 1 meter, and if it is used to avoid hygienic dead corners in the future, it is a meter.
Generally, screws are better! Because after the rivet is riveted, once there is a problem with the door, then it is more troublesome to replace! It's not as easy to load and unload as screws! Rivets can break the door, and the screws are tightened harder than the table. Hope it helps!