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Cement Lined Tanks Provide Longer Service Life

Q: What is the most common reason why a water heater fails?

A: Failure of a tank's protective lining allows water to come into direct contact with the steel tank causing it to corrode and leak.

Therefore, the type of protective lining is the single most important feature when determining the quality of any water heater. The ability of a lining to protect the steel tank is primarily based upon its thickness and complete coverage of all steel surfaces.

Two Common Internal Tank Linings are Glass & Cement


Glass lining is approximately 5 mils (.005") thick & does not cover  all internal surfaces. To compensate, all glass lined tanks require a sacrificial anode rod which must be periodically inspected and replaced.


Hydrastone cement lining is a minimum of 1/2" thick (100 times thicker than glass lining) and is guaranteed to uniformly cover 100% of all internal tank surfaces. The result is a significantly longer lasting tank which does not require a sacrificial anode.

Threaded tapping material is critical for tank longevity.

Glass lined tanks are constructed with regular steel tappings which are continuously attacked by corrosive hot water due to the lack of glass lining on the internal threads. The Hubbell Model E water heater tank is constructed with solid non-ferrous copper-silicon tank tappings which are impervious to the corrosive effects of hot water.

The Hubbell Model E

is a longer lasting water heater based upon the construction features found in the Hydrastone cement lined storage tank and the result is that when you specify and install a Hubbell Model SE, you will have confidence in knowing that the owner will be provided with a trouble-free and long lasting water heater.


Each Hubbell Model E storage tank is lined with a minimum of 1/2" thick Hydrastone cement to ensure protection of the steel tank.


The Hydrastone cement lining covers a guaranteed 100% of all interior tank surfaces and is free from flaws or imperfections. Full coverage is achieved by injecting the precise amount of Hydrastone cement into each tank and then centrifugally spinning it at 250 RPM to ensure complete and uniform coverage of the lining on all interior surfaces.

Corrosion Resistance

Hydrastone cement is a specifically formulated high density lining designed to provide maximum protection from the corrosive effects of hot water.

Reduced Operating Costs

The Hubbell Model E water heater significantly reduces the total ownership cost of a water heater due to the longer life and maintenance-free benefits derived from a Hydrastone cement lined tank. Longer tank life is directly attributable to the unmatched tank protection provided by the Hydrastone cement lining and copper-silicon tappings. Aditionally, the Model E reduces operating expenses by eliminating the periodic inspection and replacement costs associated with maintaining a sacrificial anode in a glass lined tank.

Light Duty Commercial Electric Water Heater