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Okay so a couple of options open to me (reminds me of Harry Hill...but which one is best FIGHT!!!) anyway, if drained will I need to add anything when I fill it back up again? I can't see why but then I'm master of asking the stupid question.

Love this site, have never had to post before as usually find the answer hidden somewhere. My question is this. When replacing the DHW heat exchanger in my WB greenstar 30cdi combi boiler. Should I drain down the system first? I've had a good read of the instructions in the WB...