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Copper/aluminum corrosion in hot water [Kansas] 

July 7, 2008

I'm trying to solve a solar system design problem. I would like to use a copper heat exchanger and brass plumbing fittings in an aluminum tank. Will I have corrosion issues if I use plain distilled water or a mixture of distilled water with propylene glycol? The temps could hit 212F on occasion, but won't stay there for very long. Thanks, Kevin Good, Lawrence, KS

Kevin Good
product designer - Lawrence, KS, USA

Hi, Kevin. You'll have no galvanic corrosion if there is no metallic connection between the heat exchanger and the tank.

Regards,

Ted Mooney, P.E.  finishing.com Brick, New Jersey