RAYPAK XTHERM 1,000,000 BTU POOL HEATER - NATURAL GAS - Newest generation pool heater from Raypak. Vertical modulating heater offers thermal efficiencies of up to 98%. Installation of an XTherm heater will allow your facility to realize substantial energy savings and will show a short payback time, when compared to your existing heater costs. Ultra low NOx emissions with multiple venting options. XTherm has one of the smallest installed footprints available. Cold water run system protects against condensation in primary heat exchanger. Includes: Cupro-nickel finned tubes, bronze headers, and electronic diagnostic controls. Venting and Cal Code ignition ordered separately. Contact us for requirements on heaters installed above 5,000 ft. All models are indoor/outdoor certified. Specify state code requirements. ASME Certified. 10 Year Limited Warranty.