(Natural or Propane) gas water heater(s) shall be A. O. Smith TX1 model # _________ or equal, minimum 96% thermal efficiency, a storage capacity of 119 gallons, an input rating of 199,000 BTUs per hour, a recovery rating of 232 gallons per hour (gph) at 100°F rise and a maximum hydrostatic working pressure of 160 psi. Water heater(s) shall: 1. Modulating gas burner that automatically adjusts the input based on demand. 2. Dual anodes. 3. Have seamless glass-lined steel
tank construction, with glass lining applied to all water-side surfaces after the tank has been assembled and welded; 4. Meets the thermal efficiency and/or standby loss requirements of the U. S. Department of Energy and current edition of ASHRAE/IES 90.1; 5. Have foam insulation and a CSA Certified and ASME rated T&P relief valve; 6. Have a condensing tankless with modulating burner as the heat source; 7. Be approved for 0˝ clearance to combustibles.
The control shall be an integrated solid-state temperature and ignition control device with integral diagnostics, graphic user interface, fault history display, and shall have digital temperature readout. 1. All models are design certified by Underwriters Laboratories (UL), Inc., according to ANSI Z21.10.3 - CSA 4.3 standards governing storage type water heaters; 2. Meet the thermal efficiency and standby loss requirements of the U. S. Department of Energy and current edition ASHRAE/IES 90.1; 3. Complies with SCAQMD Rule 1146.2 and other air quality management districts with similar requirements for low NOx emissions; 4. Complies with NSF Low Lead Standard.
For Standard Power Venting: Water heater(s) shall be suitable for power venting using a (3˝ or 4˝ ) _______ diameter PVC pipe for a total distance of (70 ft or 100 ft.) ______ equivalent feet of vent piping. For Power Direct Venting: Water heater(s) shall be suitable for power direct venting using a (3˝ or 4˝ ) _______ diameter PVC pipe for a total distance of (70 ft or 100 ft.) ______ equivalent feet of vent piping and (50 ft. or 120 ft.)______ equivalent feet of intake air piping.
Operation of the water heater(s) in a closed system where thermal expansion has not been compensated for (with a properly sized thermal expansion tank) will
void the warranty.
Tankless Water Heater
4.8 
