FeaturesIdeal to keep hydroponic solution in your reservoir at the perfect temperatureMicrocomputer control system and LCD displayUser friendlyLarge refrigeration capacity (recommended 26-80 gal, 100-300L)Freon free, environmentally friendly (R134a)Temperature memory system17.6"L x 13"W x 17.3"H Use AAPW250 for lowest temperature range Use AAPW550 for higher temperature rangeCapable of chilling approximately 80 gal by 15 F and 26 gal by 30 F (in 20 hrs)Tubing size: 1/2" (HGTB50), 3/4" (HGTB75)