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WATER SUPPLIES

ANODE INSPECTION AND REPLACEMENT

The anode installed in your water heater will slowly dissipate whilst protecting the cylinder. The life of the

cylinder may be extended by replacing the anode.

If the anode is not replaced during a five year service (refer to “Major Five Year Service” on page 7) then the

maximum time after installation when the anode should be replaced for this electric water heater is 8 years.

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 replaced

within 5 years of installation.

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.

SATURATION INDEX

The saturation index is used as a measure of the water’s corrosive or scaling properties.

In a corrosive water supply, the water can attack copper parts and cause them to fail.

Where the saturation index is less than –1.0, the water is very corrosive and the Rheem warranty does not

apply to a copper sheathed heating unit. A corrosion resistant heating unit must be used for the Rheem

warranty to apply to the heating unit.

In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface.

Where the saturation index exceeds +0.40, the water is very scaling. An expansion control valve must be

fitted on the cold water line after the non-return valve to protect and for the Rheem warranty to apply to the

temperature pressure relief valve and water heater cylinder.

Where the saturation index exceeds +0.80, the Rheem warranty does not apply to a standard watts density

heating unit. A low watts density heating unit must be used for the Rheem warranty to apply to the heating

unit.

Water which is scaling may be treated with a water softening device to reduce the saturation index of the

water.

Contact Rheem Service or their nearest Accredited Service Agent if a replacement heating unit is required.

Refer to the Saturation Index chart on page 11.

Refer to the cold water connection detail on page 20 for the position of the expansion control valve.

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Rheem 50 Wartungshandbuch Seite 10