Hi,
Thank you for this review. We apologize for the inconvenience that you have experienced because of the temperature variation on your water heater. The water heater that you have reviewed includes a 12-year heat exchanger warranty, a 5-year parts warranty, as well as a 1-year labor warranty. Please call our Technical Support team at 866-279-4566 between the hours of 7 A.M. and 7 P.M. CST at your earliest convenience. One of our experienced analysts will be happy to assist you with parts questions, as well as potential service options available to you.
Derius