Quote Originally Posted by master plumber mark
Read the fine print in all tankless warranties
that ten year warranty is void if you have water
harder than 11 parts.


Our CITY WATER in INDY is 20..

you need a water conditioner or the warranty is VOID.


http://www.weilhammerplumbing.com/houseofhorrors/

Though I don't think our water is that bad, I'm looking into this.
Also, any particular model/models that applies to?