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Old 04-21-2018, 03:31 PM   #1
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Atwood Hot Water Heater Drain Valve

I installed Camco petcock type drain on water heater last fall. Is there any problem with mixing the two metals, brass and aluminum? I used Teflon tape but don't know if this helps.
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Old 04-21-2018, 04:05 PM   #2
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I installed Camco petcock type drain on water heater last fall. Is there any problem with mixing the two metals, brass and aluminum? I used Teflon tape but don't know if this helps.
There is a reason they put a plastic plug in there in the first place. Brass and alm don't play nice. You also will not get all the sludge out of the tank with that small hole. The Teflon tape did nothing to help. It does not insulate the two. There are those that will say otherwise.

I found this after a little google search

I want to post the answer I discovered after trial and error. I installed an aluminum thermowell in the brass faucet fitting. I wrapped the aluminum in PFTE tape but since the threads are sharp they cut through the tape.

After leaving the unit for only a few days, I observed fairly heavy corrosion and pitting of the aluminum fitting.

This occurred during testing of the pipes, so it was not pressurized most of the time and only had residual water from testing operations.

I can very definitely say "aluminum and brass don't mix" when there's potable water involved.

Replaced with a brass thermowell from Amazon and all's "well" haha.

Hopefully this is helpful to someone.
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Old 04-21-2018, 04:12 PM   #3
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I installed Camco petcock type drain on water heater last fall. Is there any problem with mixing the two metals, brass and aluminum? I used Teflon tape but don't know if this helps.

Wait about 3 or 4 months and remove that valve and you WILL know why you don't mix brass or copper with aluminum. Without some kind of dielectric grease you will find that it corrodes that aluminum very quickly. The Teflon does nothing to stop the reaction.
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Old 04-22-2018, 07:57 AM   #4
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Thanks for replies. In process of de-winterizing finally. I drain hot water tank in between trips. I was trying to make it easier. Time to remove it
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Old 04-22-2018, 04:30 PM   #5
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Go to hardware store get union same size as plug and then screw fittings to it ending in a cap or valve. You can remove it for occasional flushing.

A friend did this, not my idea.
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Old 04-22-2018, 05:00 PM   #6
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Go to hardware store get union same size as plug and then screw fittings to it ending in a cap or valve. You can remove it for occasional flushing.

A friend did this, not my idea.
If it's a Atwood water heater you CAN NOT use anything but plastic or aluminum or you WILL cause the tank threads to corrode. Aluminum doesn't play well with other metals.
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