- Less Can Be More With one of most compact cabinets in the industry (33-inches high) this unit requires less space outside and provides more heating capacity inside. - Good Housekeeping Seal This model is proud to have earned the Good Housekeeping Seal a nearly century-old symbol of quality and trust. - 10 Year Limited Parts Warranty This product is covered by 10-year limited parts and 20-year heat exchanger warranties.