Application: heat pump systems, Suitable for: floor-standing installation, Vaillant enables the elevated installation of the geoTHERM VWL S outdoor unit in snowy regions. Note: a maximum of 2 bases may be used per outdoor unit. Vaillant enables the elevated installation of the geoTHERM VWL S outdoor unit in snowy regions. Note: a maximum of 2 bases may be used per outdoor unit.