Rheem Induro 6N3315M7 Owner's Manual And Installation Instructions page 16

WATER SUPPLIES
TOTAL DISSOLVED SOLIDS
The stainless steel cylinder of the water heater is only covered by the Rheem warranty when the total dissolved
solids (TDS) content in the water is less than 600 mg / L.
Note: Some water analysis reports may state the conductivity of the water rather than the level of total
dissolved solids. Conductivity, measured in microsiemens per centimetre (μS / cm), is directly proportional to
the TDS content of the water. TDS, in mg / L, is approximately 70% of the conductivity in μS / cm.
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING WARRANTY
The water heater and its components are not suitable for certain water chemistries. Those chemistries are
listed below. If the water heater is connected at any time to a water supply with the following water chemistry,
the Rheem warranty will not cover any resultant faults on the components listed below:
Water Chemistry
Chloride > 250 mg/L
Total Dissolved Solids (TDS) > 600 mg/L
pH < 6.0 or > 9.5
Saturation Index (SI) < -1.0
Saturation Index (SI) > +0.4
(if expansion control valve is not fitted)
Saturation Index (SI) > +0.8
Component
water heater cylinder
water heater cylinder
Water heater cylinder
copper sheathed heating unit
water heater cylinder
temperature pressure relief valve
standard watts density heating unit
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