Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Radiant & loop systems

Dan_3 Member Posts: 1
I'm putting on an addition. Currently I have a 2 zone loop system, boiler. Can I add a radient floor heating "zone" off the same boiler for the addition? If so what's involved?


  • Jim Eastman
    Jim Eastman Member Posts: 41
    Radiant addition

    Yes. This is a common addition. You will need to have a new supply and return source tapped into the manifold piping routed through a mixing device (3 or 4 way mixing valve) and a zoning circulator. The zoning circ is turned on by the room thermostat and the relay contacts on the zoning circ are tied into the "T - T" terminals on the boiler to bring the boiler and main circulator on when the radiant zone is calling for heat. From this basic installation, you can add outdoor reset for the floor temperature, if you wish.

    Jim Eastman
  • ta finnegan
    ta finnegan Member Posts: 121
    Sounds simple enough.

    That's where trouble can sometimes begin. Make sure the existing boiler can handle the additional load. Do the heat loss calcs or hire a pro to figure it out for you, it is worth the investment.

    Then just watch out for return temps.

    Good luck.

    To Learn More About This Contractor, Click Here to Visit Their Ad in "Find A Contractor"
This discussion has been closed.