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greenhouse radiant heat

We are installing a root zone heating system in a greenhouse. We have installed the 5/8 pex 18" deep and 18" apart. The Lochinvar EBN-150 boiler has a low temperature valve to prevent condensation and is piped primary / secondary to the soil loop. We have a Tekmar TN 4 controller and a 161 controller with outdoor anf soil temperature sensors. Has anyone had experience with this type of system? Is the the soil temperature modulated strictly on outdoor temperatures and what are the target teperature slopes to program into the system. Also what are the temperature limitations on the soil loop water? So far the engineer and Tekmar are researching these questions for me but I was hoping someone with feild experince might have answers with proven results. 


  • Brad White
    Brad White Member Posts: 2,398
    Calling all Aggies

    There was a thread on The Wall several years ago, maybe four or five, by one of our mid-west or west coast or Pacific NW practitioners who designed a greenhouse planting bed arrangement similar to what you describe.  Sorry I am drawing a blank.

    As for soil temperatures, maybe some CSU grads out there?
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"

    -Ernie White, my Dad
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