If you have any questions, pleasecall or write to:In the United States500 Tennessee Waltz ParkwayAshland City, TN 37015Toll Free: 1-877-737-2840In Canada599 Hill Street WestFergus, ON N1M 2X11-888-479-8324On-Demand Water HeaterInstallation Manual and Owner’s Guide- Do not store or use gasoline or otherflammable vapors and liquids in the vicinityof this or any other appliance.- WHAT TO DO IF YOU SMELL GAS• Do not try to light any appliance.• Do not touch any electric switch, do notuse any phone in your building.• Immediately call your gas supplier froma neighbor's phone. Follow the gassupplier's instructions.• If you cannot reach your gas supplier, callthe fire department.- Installation and service must be performedby a qualified installer, service agency or thegas supplier.WARNINGIf the information in theseinstructions is not followedexactly, a fire or explosion mayresult causing property damage,personal injury or death.Gas Tankless Water HeaterTMSuitable for combination potable water heatingand space-heating.Please refer to local codesfor space-heating compliance.FEATURING• ENDLESS HOT WATER• ON-DEMAND USAGE• COMPACT, SPACE SAVING• ENERGY CONSERVATION• COMPUTERIZED SAFETY• ELECTRONIC IGNITION• Complies with SCAQMD Rule1146.2 for natural gas Low NOxEmissions of 14 ng/J or 20-ppm• CONCENTRIC VENT• FIELD GAS CONVERSION• EASY-LINK SYSTEM*• MULTI-UNIT SYSTEM**(510C model only)Models• 110C• 310C• 510CANSI Z21.10.3・CSA 4.3 510Cmodel onlyRDRKeep this manual near the water heater for future reference whenever maintenance, adjustment, orservice is required.