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Thread: Is a heat pump neccessary for closed loop geothermal installation?

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    Default Is a heat pump neccessary for closed loop geothermal installation?

    Hi, I was wondering if it would be a good idea to run the DHW pipe under the ground before reaching taps and Boiler), and run this looped
    plastic pipe in a 2 meter deep x 50 meter long trench underground. Then this pipe would deliver water to the oil boiler (and hot taps).
    I would be thinking of just depending on the present gravity (attic tank - about 13-15 meters higher than proposed looped pipe in trench) - to circulate the water. Would this be feasible as a way of pre-heating the water before it enters the boiler? Though I realise that the water tank in the boiler would not increase in temperature until enough "new" underground water runs into it, once the taps are turned on. I am trying to think of some way of
    avoiding the high cost of a heat pump. Thank you.
    Last edited by dubman; 10-23-2011 at 09:44 AM.

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