Originally Posted by SFX Group
While in the UK, it was noted to never have hot water set over 55oC as this would create huge scale issues in the copper pipes.
However i am seeing so many copper leaks here its unbelievable, in the UK its almost unheard of, likly water quality issue i think.
In our case I think it was caused by two "old" water heaters. Both heaters were replaced when they became so old that they started leaking. I believe rust had formed inside of the water heaters and were deposited inside of the copper hot water pipes under the slab. Rust coming from iron or steel on copper causes a dissimilar metals situation with water as the electrolyte. This formed pits in the copper resulting in a pin hole leak, with probably more to come.
Just my belief but will never know for sure as I won't break open the slab to find out.