An air source heat pump is an electrically powered device that recovers heat energy from the air. For every kilowatt of electrical energy used, it provides three kilowatts of heat energy. Some homes are heated using a heat pump. Which of the following is not an advantage of using such an appliance when compared with the alternative of using a fossil fuel powered boiler?

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An air source heat pump is an electrically powered device that recovers heat energy from the air. For every kilowatt of electrical energy used, it provides three kilowatts of heat energy. Some homes are heated using a heat pump. Which of the following is <B>not</B> an advantage of using such an appliance when compared with the alternative of using a fossil fuel powered boiler?