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Even though the ground source heat pump loops (heat collectors) are laid underground, they still have to be protected from low temperatures. Burying collector pipes deeper in the ground won’t prevent them from freezing, even when they are installed above or below the frontline. Whether its a horizontal system or vertical system with a geothermal borehole, the freezing of a geothermal pump loop is caused by the pump itself, precisely, by the heat transfer principle employed in a heat pump.
As the ground source heat pump constantly removes the accumulated heat, the smaller and shorter a loop, the longer time it requires to absorb new quantities of heat, hence its susceptibility to freezing. This drawback can be overcome by installing bigger tubes, that should prevent the fluid’s temperature dropping below the freezing point. However, bigger tubes mean more pipelines (in some cases, up to 3 times more), which can strain your budget and subsequently, lengthen the payback period.
Thus, an antifreeze liquid is used in most of the ground source heat pump loops, so as to make sure that the coolant can easily flow even below 0 °C. In the following lines we present five antifreeze types that can be used for underground heat collectors.
Looking at the ground source heat pump's advantages and disadvantages can be a good starting point to understand the implications of choosing this type of heat pump for your home. Nevertheless, it is still highly recommended to consult a professional in the field.
Has this sparked your interest in ground source heat pumps? Luckily for you GreenMatch is here to help! By simply completing the form below, we'll provide you with up to 4 quotes from qualified installers available in your area. This way you won't waste hours of your time researching and you can objectively compare quotes side by side. Our service is completely voluntary and free of charge.
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Before deciding on the antifreeze type that would be appropriate for your heat pump, it is important to get in touch with local and/or regional regulatory agencies that oversee the approvement of groundworks in your area. In so doing, you’ll make sure that you are authorized to carry out the planned installation works and that the antifreeze you will use meets the safety and environment protection requirements.
If you have decided to purchase a heat pump, but you are not sure which type you would like, we are ready to help you. Fill out the form below with your personal preferences and information, and we will provide you with up to 4 different quotes from our trusted suppliers of heat pumps. You are free to choose the offer that best suits your needs. The service is free, without obligation, and takes only a few minutes.
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