Power Flushing / Acid Cleaning Closed Loop Hydronic Heating

Discussion in 'HVAC Heating & Cooling' started by JayNH, Jul 26, 2017.

  1. JayNH

    JayNH New Member

    Jul 26, 2017
    New Hampshire
    I'm installing a new boiler next week. I'm replacing a 30 year old Burnham combi boiler with a new Pensotti and HTP indirect. I'm replacing everything except the 3 radiant zone copper and baseboard heaters. The old system had a significant leak that was constantly being replenished with the auto fill. A lot of calcium and lime build up occurred on the units. I'd like to flush the plumbing before installing the new system, for the most efficient use of the existing heating system.

    Is it suggested to acid flush or Fernox style flushing prior to the installation? If so, is there a rental powerflusher that can be used and any suggestions on acid levels. I understand there is some risk/dangers with acid flushing, but i want to make sure the job is done right and safely.

  2. WorthFlorida

    WorthFlorida The wife is still training me.

    Oct 28, 2009
    Orlando, Florida
    If everything is copper I doubt there is any build up though you might find some slime inside the pipe. After the heating system is opened, put a fitting of some kind and run clean water from a garden hose. The heating contractor should know if there could be a problem since it can impact the warranty if it is believed that the heating system has blockage. If you have cast iron radiators or iron pipes, then there could be a build up but you stated everything is copper.
    Last edited: Jul 28, 2017
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  4. bgard

    bgard Member

    Jun 11, 2017
    NW Indiana
    Most of the time the calcium only form in the area of highest temperature and lowest velocity, ie the boiler. If there is anything in the rest of The system you can circulate white vinager through it with a small utility pump and a five gallon bucket
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