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EERE » BTO » Building America » Solution Center Home » 11.2.1 For non-electric equipment: if rated in EF or UEF, meet the efficiency levels specified in the ENERGY STAR Multifamily Reference Design; if rated in Et ≥85%, or for Nat’l v1.2 ≥ 90%.

11.2.1 For non-electric equipment: if rated in EF or UEF, meet the efficiency levels specified in the ENERGY STAR Multifamily Reference Design; if rated in Et ≥85%, or for Nat’l v1.2 ≥ 90%.

See the following guides for relevant information.

Gas-Fired Tankless Water Heaters
Gas-Fired Boilers