Green (copper color) to vinegar when descaling unit.

cwatkin

Premium Member
Joined
Jul 23, 2017
Messages
35
Location
MO
I installed an EcoSmart Eco 18 tankless water heater a little under a year ago. I could tell that the response time of the unit as well as the temp stability was decreasing so decided to descale the unit using white vinegar as suggested.

It definitely needed to be descaled but one thing that concerned me is that the vinegar had a nice copper color green to it when I was done. I know the elements in this thing are made of copper. Is this normal or signs of trouble? The circuit breakers were turned off before starting on the process of course. I figure that needed clarification based on the things I see people do when dealing with the general public.

Any concerns or is the copper color to the vinegar normal and OK?

Conor
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
33,169
Location
Murray, Utah 84107, United States
Vinegar is an acid that reacts with copper to dissolve the mineral malachite. That's the greenish blue you see on pennies that have been in water for a long time. Vinegar won't dissolve copper but it will react to the zinc in solder. Once water goes through it there's no more chemical reaction happening.
 
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