Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 62)

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

TROUBLESHOOTING and SERVICE HANDBOOK

RELIANCE Water Heater Company Technical Training Department

DISCOLORED WATER

SYMPTOMS

Rusty, brown, black, or yellow water appearing in the hot water.

CAUSE

Complaints of discolored water are commonly blamed on water heaters and

storage tanks, but in fact, it is a rare occurrence for today’s high quality glass

lined tanks to have a lining failure significant enough to allow water to contact

enough bare metal to discolor the contents of even a small tank.

The most common cause of “rusty” water is a non-toxic iron reducing bacteria,

scientifically termed Crenothrix, Leptothrix, and Gallionella. Iron bacteria is

commonly found in soil, water wells, water treatment plants and water

distribution piping systems where soluble iron exceeds 0.2 ppm, higher levels

make conditions even more favorable. Soluble iron in the water provides food

for the bacteria. Rusty discolored water is the end result of the bacteria feeding

process. Water heaters and storage tanks usually require new anode rods as

presence of iron bacteria contributes to premature anode failure.

The requirements for the bacteria to thrive are:

Elevated level of iron and manganese in the water

Water with little or no dissolved oxygen

Temperatures below 138 F

Items that can increase the potential for this bacteria are:

Water softeners

Well water

Long periods of no water movement

TREATMENT

The simplest treatment available is shock-chlorination of the system. This is a

surface treatment, and often requires repeated trials in heavily infected

systems. The chlorination of a system requires that you follow each step

explicitly to avoid an un-treated portion of the piping system from reinfecting

another part. See Bulletin 23 for the chlorination procedure.

NOTE

Since rusty water is caused by a bacteria presence and is not caused by the

water heater, any treatment would not be considered warranty related.

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Reliant FVIR GAS WATER HEATER Technical Information Seite 62