Air source (air to water) heat pumps are now recognised as renewable technology in the drive to reduce CO_2 emissions. They use heat stored in the air, concentrate it and move it indoors. This means all types and sizes of homes can be heated, and supplied with hot water without undue damage to the environment. The pumps do use some electricity to concentrate the heat and move it around but modern, efficient, heat pumps are able to convert electricity into extra heat. This means that for every one kilowatt of electricity used, up to 4kW of heat is transferred to the building. This begs the question: "Why doesn't everyone replace the old gas boiler with one of these new heat pumps."The answer is simple - there is a big difference in the temperature of water that can be produced. A normal boiler is set to produce water at 70℃, but an efficient heat pump pushes it out at 45℃. This means householders wishing to renew an old boiler cannot make a direct replacement.
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