To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

non ferrous circs for non-oxygen barrier radiant?

paulpaul Posts: 18Member
Recently isolated a 1990's butyl rubber radiant system from the boiler using stainless HX.  Original Grundfos 15-42 cast circs were still running, two now have failed - old boiler was a electric thermal storage unit - 800 gallon tank.  Will new cast circs (grundfos 15-58) have a chance of living a long productive life as the 15-42 did or should we insist on using stainless circs?  Now that the circs are the only iron part on the radiant side of the HX, will they degrade faster?


  • Oxygen

    Oxygen will deteriorate the cast iron circulators on the radiant side if the tubing is non-barrier.  Replace them with bronze or stainless steel.  
    Often wrong, never in doubt.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!