Product Literature: ProLine® XE Tankless Condensing X3 (100 series)

    The ATI-540HX3-N tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and up to a 4 bath home in southern climates (one shower head per bath).
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Condensing Tankless with X3® Technology - Application and Installation
Condensing Tankless with X3® Technology - Features and Benefits
Condensing Tankless with X3 Technology - How It Works