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1 Front View Installation and service must be per formed by a qual i fied service in stall er, service agency or the gas supplier. WARRANTY Factory warranty (shipped with unit) does not apply to units improperly installed or improperly operated. Experience has shown that improper installation or system design, rather than faulty equipment, is the cause of most operating problems. 1. Excessive water hardness causing a lime/scale build-up in the copper tube is not the fault of the equipment and is