RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

TECHNICAL BULLETIN

BULLETIN 13

MINERAL BUILD-UP

 

SYMPTOMS

Rumbling

Crackling

Popping

 

 

 

 

 

 

 

 

 

CAUSE

With the advent of high input and larger storage tanks in both commercial and

 

 

 

residential heaters, deliming has become a necessity of modern maintenance.

 

 

 

Lime (CaCO3), is the most notable factor when discussing water hardness.

 

 

 

Lime is present in every water system to some degree across the entire

 

 

 

United States. Since lime is inversely soluble [the more you heat, the more

 

 

 

lime comes out], higher usage, excessive hardness, and increased heating

 

 

 

surface can lead to a high incidence of “limed-up” heaters.

 

 

 

 

Symptoms often include a popping of water trapped under lime deposits or

 

 

 

the sizzling of water trapped next to elements, boiling it to steam.

 

 

 

 

 

 

 

 

 

 

THE FIX

Treatment of a “ limed-up“ heater is relatively simple. Since CaCO3 is a base,

 

 

 

the easiest way to dissolve it so it can be flushed from the heater is with an

 

 

 

acid. The most commonly used is phosphoric acid at a food-grade level.

 

 

 

Two common treatments marketed by A.O. Smith are Mag-Erad

and Un-

 

 

 

Lime

. Any well-stocked plumbing supply house should have a deliming

 

 

 

solution available.

 

 

 

 

 

 

The directions on the product should be followed explicitly.

 

 

 

 

 

 

 

 

 

 

NOTES

For additional information and instructions in deliming water heaters and

 

 

 

boilers, please refer to the following pamphlets available from A.O. Smith:

 

 

 

Why? When & How: To Remove Water Scale from Tank Type Water

 

 

 

 

Heaters

 

 

 

 

 

 

The Mag-EradMethod of Cleaning Gas Fired Water Heaters

 

 

 

Up-N-DownTransfer Kit

 

 

 

 

 

All About Deliming Coil Type Water Heaters

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A.O. Smith Water Products Company

50

 

Training Department

 

©2002

 

 

Ashland City, Tennessee

 

 

 

 

Page 51
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A.O. Smith TC-049-R2 manual Mineral BUILD-UP, Symptoms, Cause

TC-049-R2 specifications

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