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.

Radiant floor heating

G TwitchellG Twitchell Posts: 8Member ✭✭
Is it necessary to use a bronze pump or can I use a cast iron pump for circ in a PEX (wirsbo) floor system???
· ·

Comments

  • EinsiedlerEinsiedler Posts: 93Member
    open vs closed

    If you are using PEX pipe for infloor heating... I will assume that it is going on an "open system". as such, non-ferrous pumps must be used, so Bronze is the way to go.

    If this is on a closed system. Wrong pipe to use. it will allow oxygen to permeate into the system, causing several issues including "rusting" all ferrous components.

    I'd use PEX with OB (oxygen barrier). this allows you to go either way (open or closed) and allows for future installation of proper "Closed" system.

    Only use Cast Pumps on closed systems.

    EIN


    · ·


  • Hepex has an O2 barrier, so as long as you are not connected to an open system (water heater, no heat exchanger... which you shouldn't be!!!) you don't need a bronze pump.

    Aquapex, another Wirsbo product, does not have an O2 barrier and would require a bronze pump.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
    · ·
  • G TwitchellG Twitchell Posts: 8Member ✭✭


    I have a standard 50 gal water heater in the loop as a buffer/volume and I have HePex poured in the floor. I am using a TAKAGI tankless boiler/heater (190kbtu max) with no sidearm domestic hot water unit. I guess I can use the cast iron pump according to your reply.
    · ·
  • EinsiedlerEinsiedler Posts: 93Member
    you have barrier pipe then

    you are good to go.
    Hepex is a great pipe c/w Oxygen Barrier.

    · ·
This discussion has been closed.

Welcome

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