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Thread: Radiant heat question.

  1. #1

    Default Radiant heat question.

    I have a radiant heat system in my 27x30 shop. Due to the high costs of Propane in this area I don't want to turn the system on this year. I'm also not in the shop everyday so I really don't need it right now. I installed an electric heater to just heat the shop when I use it.
    Now my question is it only has water in the lines. I need to flush that out and replace it with antifreeze so it doesn't freeze. It gets real cold here in NY.
    How would I go about flushing out the water and putting in the antifreeze?

  2. #2
    Master Plumber nhmaster's Avatar
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    you need a pump and some anti freeze along with wome knowledge as to where the shutoffs are and the purge valves.

  3. #3

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    I know where all that stuff is. I need to know how to pump out the water. Theres only one valve that was installed to fill it. It's a closed loop system so it only has one.

  4. #4
    Master Plumber nhmaster's Avatar
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    when you pump the anti freeze in, the water will preceed it.

  5. #5

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    So what would I do pump in the antifreeze and let the water come out of? The purge valve? Thats the only other stop that could be opened up to let it out.

  6. #6
    Master Plumber nhmaster's Avatar
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    Eureka !!!!!!!!!!!




    See how much can be acomplished in so few words

  7. #7

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    OK thanks for the help. One last question. How much antifreeze would I need to flush out the system? As I said before it is a 27x30 shop.

  8. #8
    Retired Defense Industry Engineer jadnashua's Avatar
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    Most of the systems want something like a 50-50 mix. you normally wouldn't want more than that...check the instructions.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  9. #9

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    I know how the antifreeze works. I wanted to know how much I should buy.

  10. #10
    Master Plumber nhmaster's Avatar
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    You have to do a bit of calculating for length of run and diameter of pipe. You remember, volume of a cylinder?

  11. #11

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    This could be though then. I know we used 1/2 pex. We also used a full roll. But I don't remember how many feet were on the roll.

  12. #12
    Master Plumber nhmaster's Avatar
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    100, 300 or 500. Your best quess I quess. Me however, Id mix 2 gallons anti freeze with 2 gallons water and start with that.

  13. #13

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    Thank you sir, you have been a great help. I wasn't sure if it would hold 5 gallons of 20 gallons.
    Is there a special kind of antifreeze for heating systems? Or any brand that works better?
    Last edited by monz78; 11-18-2008 at 07:13 PM.

  14. #14
    Master Plumber nhmaster's Avatar
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    Cyro-Teck and no you can't use automobile anti freeze.

  15. #15

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    I had an ideal I couldn't. I do not most aspects of the heating system. But I'm not an expert in any means.
    Thanks for the help.

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