The Daikin Altherma 3 is also available as split system which means it includes an indoor unit and an outdoor unit. You also have the choice between a wall hung indoor unit with an optional hot water tank or a floor standing indoor unit with the hot water tank included inside it. This air source heat pump is best suited to new builds and works particularly effectively with underfloor heating or low temperature radiators. The outdoor unit can be installed up to 50m away from your home for maximum flexibility when it comes to heating system installation.