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Posted by Harold hydronicnetwork.net on January 09, 2004 at 08:17:28:
In Reply to: Re: Still Clueless about Hydronic heat. Maintenance question posted by Karen on January 09, 2004 at 07:31:41:
You don't know if there has been a leak for years, so you don't know how much rust has been transferred into your system and you don't know how much oxygen has been introduced into the boiler over the years. Don't flush the system this winter if it is operating OK.
Get a pro to flush it in the spring or summer. Then tell him to drain it. Add a low water cutoff to the systeme above the boiler. Then have him refill the system with distilled water from the food market (used for ironing in hard water areas.) After that you can keep the hand valve closed until such time as service to fix a leak is needed. If there are no leaks after that, you will not need to flush or add water to the system until changing a circulator or some other repair.