Dr. Heater USA warrants that all heaters are free from defects in material and workmanship under normal use and service for three years after date of purchase. After receiving the heater, you must register the unit by completing the Warranty Form and mailing it back to us. In order to keep this limited warranty in effect, the heater must have been handled and used as prescribed in the instructions. This limited warranty does not cover any damage due to accident, misuse, abuse or negligence. This limited warranty is valid only if the product is used with the equipment specified on the product box. All of our products are backed by 30 days Satisfaction Guarantee. If the heater arrived damaged, we would be happy to replace the heater with a brand new working unit. Please call us at 800-317-1688 M-F 9am - 6pm PST or Saturday 10am - 4pm PST and a customer service representative will be able to assist you with any questions you may have.