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Should I flush my hot water radiant system occasionally?
Hi- I've got a self-installed (with a bit of pro engineering in the beginning) radiant system with a Burnham RV3 cast iron boiler and 2 Grundfos pumps pushing (?pulling!) hot water through 3 radiators and 2 lower temp zone areas plus a concrete slab in one area and tubing over subfloor in another. The system has needed maintenance items- valve motors, 1 noisy pump replacement, a boiler controller over about 15 years but hasn't had a leak or plumbing issues during this time. It's only been "opened up" about 4 or 5 times with the open areas limited by isolation valves for the most part. With the advice of a couple of really great suppliers and online information, I've done all the maintenance myself. I've never had a "pro" look at this system. I clean the firebox fairly regularly but as far as I can tell, nothing else has been needed. I still have this nagging feeling I should clear that black stuff from the system and get fresh (distilled or deionized?) put back in. Anyone have a take on this question? Any help would be appreciated.