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Posted by Mike on April 01, 2008 at 20:38:00:
I am considering replacing the DHW coil in my boiler. It looks simple enough. However, I'm not sure how to drain and refill boiler. I believe I have found drain spicket and I have identified valve for water entering the unit, but I unsure if it is as simple as draining and refilling. What about air entering the lines?