Probably a stupid question but , I am looking to replace an older utica gas fired hot water baseboard system with a mod con. Should I just flush the lines good with fresh water before disconnecting the old unit or should I add some boiler “cleaner” , run it to circulate the cleaner then flush and refill with fresh water? Also I have some hercules boiler/system cleaner, how would I add it to my closed system? Thanks for any help. I will be adding all new pumps, diret seperator etc…
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