Farm Innovators Model HRB-20 Heated Water Bottle for Rabbits, 32-Ounce, 20-Watt 32-Ounce Bottle Thermostatically Controlled To Operate Only When Necessary Prevents water from freezing in subzero temperatures Perfect For Rabbits, Guinea Pigs, Birds Or Small Rodents 32-Ounce bottle Thermostatically controlled to operate only when necessary Prevents water from freezing in subzero temperatures Perfect for rabbits, guinea pigs, birds or small rodents 20 Watts