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  • #31
    What about brass boilers in comparative sense to SS and copper, do they have similar issues to SS?

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    • #32
      Originally posted by nate07 View Post
      What about brass boilers in comparative sense to SS and copper, do they have similar issues to SS?
      Brass/Copper Boilers are absolutely fine and do not suffer Pinhole/Crevice corrosion that s/steel ones do...

      Mal.

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      • #33
        No, however brass boilers suffer so badly from the dreaded "fish oil taint" that it caused me to develop a simple test for it*.

        Also, there are hundreds (thousands?) of grades of stainless and they are far from equal. Several of the grades used in espresso gear taste metallic - presumably too many of the manufacturers use heavy smokers as their taste testers.

        Putting crap water into any espresso machine that runs at circa 9 atmosphere's pressure and 90 degrees Celsius is just asking for medium term reliability trouble.

        TampIt
        *Simple test:

        1) fill your espresso machine with enough of your chosen water to pull a couple of shots (FYI, I usually fill it to the max). Turn it on and (optionally after a single preflush to warm it all up) pull a 60+ml shot into a glass container you can cover. Let it cool down to room temp.
        2) Then immediately pour the same amount of water directly into the same type of covered glass container.
        3) After the "espresso water" has reached room temp, compare the two waters. Whatever the difference is, that is the taint that is present in every espresso shot you are pulling.

        Be prepared for a rude awakening.

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