nicktheplumber
Gary makes a good point about the “glass” lining of some water heaters. I suspect that the corrosion leaks seen in such tanks (and they do corrode and leak) is due to the fact that the inlet and outlet connections to the tanks is made of ferrous metal. Unless the WHOLE cold water supply and hot water distribution system is lined with an inert material, there will be points where water is in contact with metal. As regards the tank, these points are at the inlet, outlet, and overflow connections. These parts are subject to electrolytic corrosion and leakage. the corrosion at a connection can also extend to the OUTSIDE of the ferrous tank. For this reason, sacrificial anode rods are a good idea in any tank connected to a metallic pipe system…
NtP
