Szukana fraza: [Abstract = "A heat pump uses natural energy from renewable sources such as air, ground or water. The pump, acquiring thermal energy from the environment \(75%\) and using electricity \(25%\), supplies it to the heated object. A heat pump\-based system consists of a ground heat source \(heat is taken from it\), a heat pump unit and an upper heat source \(heat is transferred to it\)."]

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