Rheem XWELL XC-10 Owner's Manual And Installation Instructions page 7

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
Total Dissolved Solids (TDS) > 600 mg/L water heater cylinder
Saturation Index (SI) < -2.0
Saturation Index (SI) > +0.8
Chlorides > 200 mg/L
Contact your local Rheem Dealer if a replacement of the heating unit is required.
CAUTION
If the water supply has a Total Dissolved Solids (TDS) content greater than 600 mg/L,
there is the possibility the anode may become overactive and hydrogen gas could
accumulate in the top of the water heater during long periods of no use.
If, under these conditions, the water heater has not been used for two or more weeks
the following procedure should be carried out before using any electrical appliances
(automatic washing machines and dishwashers) which are connected to the hot water
supply.
The hydrogen, which is highly flammable, should be vented safely by opening a hot
tap and allowing the water to flow. There should be no smoking or naked flame near
the tap whilst it is turned on. Any hydrogen gas will be dissipated. This is indicated
by an unusual spurting of the water from the tap. Once the water runs freely, any
hydrogen in the system will have been released.
ABOUT YOUR WATER HEATER
Component Not Covered
incoloy corrosion resistant heating unit
incoloy corrosion resistant heating unit
incoloy corrosion resistant heating unit
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