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Posted by HeatPro on February 14, 2011 at 21:28:22:
In Reply to: residential steam boiler water treatment posted by Jim on February 14, 2011 at 13:55:33:
Use nothing but plain water. For over a century, steam boilers were drained of some rusty sludge weekly as a normal practice. There is no way you can coat the pipes of the entire system to prevent rust.
Do as instructed in the service manual.