• Lake/Pond Ground Source Heat Pumps

  • If you have a large body of water next to your home you can gather energy by installing a ground energy collector into the lake and use a GSHP. This method provides a consistent amount of energy all year round, for hot water, heating and cooling.

    Maintains excellent source temperature all year round

    Can be very highly efficient

    Low impact on your land

    Low maintenance

  • How it works

    Large bodies of water retain heat derived from the sun and the ground below the lake. Whatever time of year, this temperature difference can be exploited for heating and cooling your home. We install a system of flexible pipes or stainless-steel collector plates containing thermal transfer fluid into the lake or body of water.

    The thermal transfer fluid absorbs heat from the surrounding water as it passes through the pipe and carries it to a GSHP. The heat pump itself then functions as it would for any GSHP system using the refrigerant and heat exchangers to extract the energy from the thermal transfer fluid and to enable this energy to be transferred in to the property.


    Quarry case study: lake source was better than trench source

    This customer approached us for a heat pump using horizontal trenches. When we visited the site it was a disused quarry, with rubble and waste making conditions difficult for creating good trenches. Instead we suggested taking advantage of the large quarrying hole filled with ground water, as this lake seemed to be a more viable source of energy for a Ground Source Heat Pump.

    In the centre of the lake, the depth was almost 5m, so there would be excellent stratification resulting in water temperature remaining stable at approximately 4 degrees Centigrade in the coldest winter days, rising as the weather warms through spring.

    After discussing the potential for the lake to be used and the issues of trenching on the site, plus the better system efficiencies likely to be achieved from it, the client agreed to proceed to calculations.

    The proposed building's energy loads were calculated and the customer opted for first floor underfloor heating and low temperature radiators elsewhere. We worked with the client to ensure he correctly sized all of his heat emitters to get the best out of his Ground Source Heat Pump system.

    The ground array design was completed and resulted in the need for three lake mats arranged on a supporting mesh. The position of the mats was identified by measuring the depths of the lake bed. The mats were towed to their position and the loops were filled, allowing them to sink to the bottom.

    The heat pump was installed, with a 100 litre buffer vessel, linked to a 300 litre domestic hot water cylinder, and set up to prioritise the domestic hot water to ensure a constant supply.



  • Ground & Water Source Solutions

    Using the ground as an energy source

  • Air Source Solutions

    Using the ambient air as an energy source

  • Underfloor Heating Solutions

    Using space-saving underfloor systems

  • Solar Panel Solutions

    Capturing the energy of the sun