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Posted by Jeremy on May 24, 2010 at 19:41:04:
Hello, I am having a very reputable heating company install a GB142 with st120 indirect in my home. Everything I read says to not use softened water to fill the closed loop part of the system (or use it for makeup water) because of the aluminum heat exchanger. The installers says it's not a problem and never heard of such a thing or using any kind of anti corrosion chemical. Should I insist they use untreated water for filling and make up? An untreated water line is very close to where the boiler is being installed.