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New Build Heat Pump

  • 03-11-2013 11:47pm
    #1
    maysville
    Registered Users Posts: 9 ✭


    We're starting a new build next week
    Originally we had planned on solar panels, condenser boiler, a back boiler stove, and rads throughout the house.
    But are now looking into air to water heat pump with underfloor heating on the ground and first floor and rads in the converted attic space (2 bedrooms, a landing and a shower room)
    The specs are, 405m2 (excluding converted attic).
    The floors are insualted to 140mm.
    The attic is insulated to 300mm
    The external wall construction is as follows block 100mm with 150mm pumped bead cavity and block on flat on inside which is 225mm. There is no insulated board on the inside as we don't want to have plaster board walls.
    There is thermal bridging around the windows and doors with insulated galvanised lentils.
    The house will be air tight. Our windows are timber sliding sash, double glazed and argon filled with a U value of 1.0 W/m2K.

    Our Engineer has given us a proposed BER of B1 based on the above specs.

    In recent weeks we have been looking into air to water heat pumps and also GSHP. I would love any advice that anyone has on these. If we were to go down the heat pump route we would be doing UFH, no solar panels and no back boiler on the stove.

    The main reason we want to go down the heat pump route is to reduce the cost of heating the house.

    The more I read about them the more confused I get. It looks at the moment like the GSHP is too cost prohibitive for us the the only real option is the air to water heat pump.

    The concerns I have are as follows
    * The humidity in Ireland causing the pump to ice up and the energy cost of deicing the pump.
    * High electricity costs
    * Will the initial increased installation cost of the heat pump and UFH combined with the electricity bill actually make a real saving versus a condenser oil burner and oil.
    * life span of the unit.
    * Due to the size of the heat pump we need we have read that we would require 3 phase electricity. We are building in a very rural area, miles away from any town and are unsure if 3 phase electricity is even available to us. If it were available to us, the instillation cost to ESB is more at the time but how much would you save in running costs with 3 phase electricity?

    Any advice is much appreciated

    one thread is enough


This discussion has been closed.
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