A.O. Smith BFC - 28 - Manual (Page 19)

Environmental conditions
Release R.1.3 UK 19
is
If the available clearance is less than 100 cm, flexible magnesium anodes
may be ordered from A.O. Smith, the installer / supplier.
n Remark
When installing the appliance, be aware that any leakage from the tank and/
or connections can cause damage to the immediate environment or floors
below the level of the boiler room. If this is the case, then the appliance
should be installed above a wastewater drain or in a suitable metal leak tray.
The leak tray must have an appropriate wastewater drain and must be at
least 5cm deep with a length and width at least 5cm greater than the
diameter of the appliance.
Figure 3.1 Working clearances
IMD-0073a