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We installed 8kW thermal power ground source heat pump here in Sweden 11 years ago. Never looked back. We use 170m deep borehole as heat exchanger. Only issue we had was one worn out brine pump. It works fine and is able to heat the house to 22 degrees C when it is -20 degrees outside. It draws around 1.4kW of electricity (depending on if it is heating tap water or the house).
It is docked to underfloor heating to maximize COP (heat pumps do not like high temperatures).
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Thank you for your time,
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