DANGER: Indicates the presence of immediate hazards which will cause severepersonal injury, death or substantial property damage if ignored.WARNING: Indicates the presence of hazards or unsafe practices which could causesevere personal injury, death or substantial property damage if ignored.CAUTION: Indicates the presence of hazards or unsafe practices which could causeminor personal injury or product or property damage if ignored.NOTE: Indicates special instructions on installation, operation, or maintenance whichare important but not related to personal injury hazards.DANGER: Make sure the gas on which the heaterwill operate is the same type as that specified on theheater rating plate.WARNING: Should overheating occur or the gassupply valve fail to shut, do not turn off or disconnectthe electrical supply to the heater. Instead, shut offthe gas supply at a location external to the heater.WARNING: Do not use this heater if any part hasbeen under water. Immediately call a qualifiedservice technician to inspect the heater and toreplace any part of the control system and any gascontrol which has been under water.WARNING: To minimize the possibility of improperoperation, serious personal injury, fire, or damage tothe heater:• Always keep the area around the heater free ofcombustible materials, gasoline, and otherflammable liquids and vapors.• Heater should never be covered or have anyblockage to the flow of fresh air to the heater.WARNING - CALIFORNIA PROPOSITION65: This product contains chemicals known to theState of California to cause cancer, birth defects orother reproductive harm.WARNING: Risk of electrical shock. More than onedisconnect switch may be required to de-energizethe equipment before servicing.CAUTION: This heater requires forced watercirculation when the burner is operating. Severedamage will occur if the heater is operated withoutproper water flow circulation.CAUTION: If this heater is to be installed aboveradiation level, it must be provided with a low watercut-off device at the time of heater installation.CAUTION: If this heater is to be installed in anegative or positive pressure equipment room, thereare special installation requirements. Consult factoryfor details.WARNINGSPay Attention to These TermsNOTE: Minimum 18 AWG, 105°C, stranded wiremust be used for all low voltage (less than 30 volts)external connections to the unit. Solid conductorsshould not be used because they can causeexcessive tension on contact points. Install conduitas appropriate. All high voltage wires must be thesame size (105°C, stranded wire) as the ones on theunit or larger.California Hot Water Supply, Inc.(800) 249-72444