01-26-2016, 08:33 PM
Black wrote:
[quote=Paul F.]
When you connect a steel tanked water heater to copper piping, you create a battery, which creates corrossion. The sacraficial anode is put there to be the part that corrodes away to protect the expensive bits from corroding away.
Hmmm.... not sure that battery analogy applies here. The di-electric couplings should take care of this. I think the anode just draws off the corrosion from the steel tank by being more corrosive.
Water (specifically, water with crud in it like minerals, etc) is conductive enough to complete the circuit... which is where the corrosion comes in.