Zodiac Jandy LXi LXI400NN 400K BTU Natural Gas Polymer Header Pool and Spa Heater with Cupro-Nickel Tubes Exchanger 400K BTU natural gas polymer header pool and spa heater Digital, remote control, automation ready Communicates with the AquaLink RS family of controls Fan assisted low NOx combustion; ASME rated Includes cupro-nickel tubes and exchanger