Thread Tools Search this Thread Display Modes
Old 09-16-2011, 10:24 PM   #1
2 Rivet Member
Bethany533's Avatar
1983 30' Airstream 300
Covington , Louisiana
Join Date: Aug 2011
Posts: 54
Brass fitting into water heater

Does anyone have an opinion about using brass in the plumbing system with an aluminum water heater? My concern is galvanic corrosion.

Bethany533 is offline   Reply With Quote
Old 09-16-2011, 10:30 PM   #2
Rivet Master
dznf0g's Avatar

2007 30' Classic
Oswego , Illinois
Join Date: Jul 2010
Posts: 9,794
Images: 5
Well, I'm no expert on the reactivity of various metals...I do remember someone here on the forums is. But I don't THINK that brass vs. aluminum is very corrosive. I do know that my old SOB was 17 years old and I had several brass fittings on a pressure expansion tank system and H2O heater drain valve. Still had the original water heater when I traded for my AS.

dznf0g is offline   Reply With Quote
Old 09-17-2011, 04:24 AM   #3
Rivet Master
richinny's Avatar
2011 34' Classic
Westchester Cty.NY , / Miami FL
Join Date: Jul 2007
Posts: 3,122
read this thread:
2012 F150 Super Crew 5-1/2' bed Ecoboost 4x4 3.73 elec. lock diff. Propride hitch
give life. kidney & pancreas transplant 9/9/06
Ingrid-my unofficial '"World's Oldest Streamer" 1909-2008 R.I.P.
richinny is offline   Reply With Quote
Old 09-17-2011, 06:42 AM   #4
Well Preserved

1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,362
Originally Posted by Bethany533 View Post
Does anyone have an opinion about using brass in the plumbing system with an aluminum water heater? My concern is galvanic corrosion.
That's how they came from the factory. In our 40 year old Airstream, we have an aluminum tank, brass fittings, and copper pipes.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
overlander63 is offline   Reply With Quote
Old 09-17-2011, 08:37 AM   #5
Kevin245's Avatar

Vintage Kin Owner
... , ...
Join Date: Jul 2007
Posts: 9,637
Images: 9
Corrosion is a consideration when joining dissimilar metals. The Anodic Index (AI) lists metals in order of nobility with brass being in the 0.40 to 0.45(V) range, and aluminum (other than 2000 series) coming in around 0.9 to 0.95(V).

The rule of thumb is to keep the AI variance to no more tha 0.25(V) in normal conditions. That being said...brass to aluminum isn't a good combination on paper. In reality though, it is commonly used as Terry indicates.

We have brass fittings in our WH and they work fine. Using an application suitable sealant helps minimize the effect.

We also replaced the drain plug with a thumb value that makes draining the WH much easier.

Atwood water heater drain plug - Airstream Forums

"You wouldn't worry so much about what others think of you if you realized how seldom they do."

Eleanor Roosevelt

Kevin245 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacing Water Heater in Argosy 24ft '75 HELP!! eyelashsoup Water Heaters, Filters & Pumps 10 08-23-2011 07:56 PM
Atwood water heater fast cycling Skater Water Heaters, Filters & Pumps 4 07-22-2011 07:02 PM
Water heater won't lite aswbe Water Heaters, Filters & Pumps 6 06-06-2011 09:18 PM
Water Heater Calcium Deposits -- What to do? Wilmington Water Heaters, Filters & Pumps 7 05-18-2011 03:11 PM

Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:34 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.