Application: heat pump, frost protection resistant down to: -28°C, content: 20l, Vaillant brine liquid (ready-mixed) with frost protection for temperatures down to -28°C. Content 20 l. Note: only for geoTHERM VWL SVaillant brine liquid (ready-mixed) with frost protection for temperatures down to -28°C. Content 20 l. Note: only for geoTHERM VWL S