History unknown. Recommended for Aquarium sizes between 60-200gallons (227-757 L). Info in link: https://www.bing.com/search?q=Teco+TK-1000+Aquarium+Chiller&cvid=3ba337a17e534fc081418a5e9d128cde&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQABhAMgYIAhAAGEAyBggDEAAYQDIGCAQQABhAMgYIBRAAGEAyBggGEAAYQDIGCAcQABhAMgYICBAAGEDSAQc0ODNqMGo0qAIIsAIB&FORM=ANAB01&PC=SCOOBE Please inquire in person @ All-Ways Towing Monday through Thursday between the hours of 9am & 6pm ONLY or by email. This is the only time that someone will be available to provide a viewing. Telephone inquiries will not be answered by Dispatch. Thank you for your cooperation. We are located at 647B Dupplin rd