Rheem Electric Domestic Water Heater Installation And Owner's Manual page 12

WATER SUPPLIES
warranty applies to a vitreous enamel lined water heater cylinder if the
correct coloured anode is used for the TDS / conductivity level of water
0 40 150 400
Black
Green
0 60 215 570
ANODE INSPECTION
The anode installed in your water heater will slowly dissipate whilst protecting
the cylinder. The life of the water heater cylinder may be extended by arranging
for an authorised person to inspect the anode and replace if required.
The suggested time after installation when the anode should be inspected is:
Rheemglas
RheemPlus
Optima
For water supplies which are either softened, desalinated or where the water
supply may alternate between a water tank and a reticulated public supply or
another supply, it is recommended the anode be inspected 3 years earlier than
"Anode"
shown (refer to
CAUTION
If the water supply has a TDS greater than 150 mg/L and a green anode has
not been changed to a black anode, or if the TDS is greater than 600 mg/L and
the anode has not been changed to a blue anode, 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.
TOTAL DISSOLVED SOLIDS & CONDUCTIVITY
(vitreous enamel lined water heater cylinder)
TOTAL DISSOLVED SOLIDS (TDS) - mg/L
600
860
CONDUCTIVITY - µS/cm
ANODE SELECTION
8 years
8 years
10 years
on page 11).
Blue
12
no warranty
applies
to a vitreous
enamel lined
water heater
2500
cylinder
Blue
3570