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Radiant Floor Heating. How do I get more heat?

radiant heating

Here’s a diagram…

http://home.comcast.net/~kierchar/radflr.jpg

I get 160 degree water in the injection loop (1/2" cooper tubing loop on diagram). Maybe the 1/2" pipe is too small. Would 3/4" work, or defeat the purpose?

I can’t seem to get no more than 80-85 degree water, supplying the zones. Any suggestions?
It has been 4 days and still, no heat. It should take 3 days (even shorter since I have backup forced air heat)

Insulation is not the problem. I am getting 160 degree water through the variable-speed injector pump. Just not enough of it.

I talked to a few pros and they haven’t given me an answer yet. I have tried the recommended outdoor settings (via PC705 computer) for various conditions, such as mine.

Admin @ www.HeatingForHome.com

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6 Responses to “Radiant Floor Heating. How do I get more heat?”

  1. avengergt Says:
    February 17th, 2011 at 1:34 am

    The diagram looks odd. What is forcing the loop to move water thru the boiler? How do you expect to move 35,000 btus thru a 1/2 water line?
    Looks like someone should go back to their tables and figure out what size pipe will move enough btu’s

  2. brian d Says:
    February 17th, 2011 at 1:34 am

    Did you just turn it on? It will take days for the floor mass to heat up. You have to be patient with radiant heating. It is not instantaneous.

  3. shannonlee05 Says:
    February 17th, 2011 at 1:34 am

    HUBBY SAID U COULD USE 3/4 BUT YOU LL LOSE THE SAME IF NOT MORE BUT HE SAID HE THINKS UR PIPES ARE NT INSULATED WELL.TRY BETTER INSULATION OF THE MAIN PIPES GL

  4. ccudd13 Says:
    February 17th, 2011 at 1:34 am

    If this is a do it yourself job and it looks like it. You get what you paid for. Now you can call a license heating tech to come and fix this mess. Go cheap get cheap.

  5. lego Says:
    February 17th, 2011 at 1:34 am

    has the system been bled of air in the last few years?

  6. lostin_dark Says:
    February 17th, 2011 at 1:34 am

    I’m with lego on this one. check for air in the system which will hinder circulation. I have seen on occasion that one zone will trump the others. try turning all systems off then turning on the main to your comfort zone. after that then turn up the others to a desirable temp.
    hope this helps

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