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Basic components of a gas tankless water heater include a high-powered burner, fan, and heat exchanger; condensing gas water heaters also have a secondary heat exchanger and a piped air intake to the sealed combustion chamber

Author(s): Brozyna, Rapport
Organization(s): IBACOS, National Renewable Energy Laboratory

Document developed to help residential builders and retrofitters transition from tank-type water heaters to tankless water heaters.