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1. | A O Smith Water Heater ATO 305N ManualA. O. Smith On-Demand Gas Water Heaters Each A. O. Smith on-demand water heater is designed for a specific application. Consult your sales representative or contact A. O. Smith for specifications and recommendations on which model is right for specific requirements. I N N OVAT I O N O N D E M A N D A. O. Smith's complete line of tankless gas water heaters Model Specifications BTU Input Natural / Propane Minimum Maximum 15,000 15,000 19,000 19,000 199,000/190,000 199,000/190,000 237,000... Brands:A | User Manual | ENGLISH | [View] | ||||||||||