Instruction manual GWV 21
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3.3.3 Water composition
The appliance is intended for heating drinking water. The drinking water must
comply with the regulations governing drinking water for human consumption.
The table gives an overview of the specifications.
Water specifications
Note
If the water specifications deviate from those stated in the table, the storage
tank protection cannot be guaranteed (16 "Warranty (certificate)").
If the water hardness is greater than 4° dH, please contact A.O. Smith.
3.3.4 Working clearances
For access to the appliance and the storage tank it is recommended that the
following clearances are observed:
• Around the appliance and the storage tank: 50 cm.
• Above the storage tank (room to replace the anodes):
- 100 cm if using fixed anodes, or
- 50 cm if using flexible anodes.
If the available clearance is less than 100 cm, flexible magnesium anodes
may be ordered.
Note
When installing the appliance and storage tank, be aware that any leakage
can cause damage to the immediate environment or floors below. If this is the
case, the appliance should be installed above a wastewater drain or in a
suitable metal leak tray.
Water composition
Hardness
(alkaline earth ions)
> 1.00 mmol/l:
• German hardness > 5.6° dH
• French hardness > 10.0° fH
• British hardness > 7.0° eH
Conductivity > 125 µS/cm
Acidity (pH value) 7,0 < pH value < 9.5
