Specifications include, but are not limited to: 1. The pool heater(s) shall be fired with gas at a rated input of 1,530,000 BTU/hr. 2. The pool heater(s) shall be CSA-tested and certified with a minimum thermal efficiency of 83.1 percent at full fire. 3. The pool heater(s) shall be ASME inspected and HLW-stamped and National Board registered for 160 PSIG working pressure, complete with a Manufacturer's Data Report. 4. The pool heater(s) shall have a floor loading of 65 lbs. /square foot or less. B. Heat Exchanger 1. The heat exchanger shall be of a singlebank, horizontal-grid design with twelve integral cupronickel finned tubes, each end of which is rolled into an ASME boiler-quality steel tube sheet. 2. The heat exchanger shall be sealed to 160 PSIG-rated bronze headers with hightemperature silicone "O"-rings. 3. The low water volume heat exchanger shall be explosion-proof on the water side. 4. The headers shall be secured to the tube sheet by stud bolts with flange nuts to permit inspection and maintenance without removal of external piping connections. The heat exchanger shall incorporate "V” baffles between the tubes to ensure complete contact of the external tube surfaces with the products of combustion. 5. The pool heater(s) shall be capable of operating at inlet water temperatures as low as 105°F without condensation. 6. The pool heater(s) shall be designed to accommodate field changes of either left- or righthand plumbing and electrical while leaving the tube bundle in place. C. Burners 1. The tubular burners shall have multiport radial gas orifices, punched ports and slots, be capable of quiet ignition and extinction without flashback at the orifice, and be manufactured from corrosion-resistant titanium-stabilized stainless steel with low coefficient of expansion. 2. The burners will be supplied with a fanassisted, clean-burning, and highly-efficient fuel-air mixture.