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Old 11-04-2011, 12:31 PM   #15
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Originally Posted by jodann View Post
Being tired of dealing with the plastic drain plug I paid a visit to my local Home Depot & purchased the shortest braided steel hose (the type used on bathroom sink water supply) and a water shut off. Now, it's a simple matter of opening the water shut off to drain the tank.
OK, you engineer types. I forgot to mention that I had also installed a copper threaded double male union between the aluminum hot water heater outlet & the braided stainless steel hose. Now I have 3 different metals in play. Will I still have a galvanic corrosion problem or would I be better off with an aluminum to cpvc to stainless combo or should I just place the old plastic plug in service again or, is this 'much ado about nothing?'

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Old 11-04-2011, 01:21 PM   #16
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A brief explanation of galvanic corrosion and a galvanic corrosion chart of metals is available HERE.


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Old 11-04-2011, 04:56 PM   #17
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According to "The Engineers Edge" website a water heater could be classified as a Harsh environment. In that case there should be no more than .15V difference (on the Anodic scale) between contacting dissimilar metals to avoid galvanic corrosion. Brass and bronze have a .4V rating on the scale. Aluminum (depending on the type) rates between .75V and .95V. So technically they shouldn't be in direct contact for extended periods of time.
I would eliminate the possibility of problems over time by simply going back to the original plastic plug. You may never have a problem but if you do the cost of repairs will far out weigh the the cost and inconvenience of replacing the plastic plug every year or so.
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Old 11-04-2011, 05:06 PM   #18
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