The Energy Star-rated NRC98, the newest addition to the Noritz ecoTOUGH Series of gas-fired residential condensing tankless water heaters, has an Energy Factor of 0.93
Among heat pump water heaters, the Stiebel Eltron Accelera 300 has the largest capacity (80 gal.), highest energy factor (2.51), lowest power input (2.2 kW) and lowest power consumption
The new edition of the guide helps
homeowners decide which improvements will yield the most bang for
their buck and help them incorporate energy efficiency into future projects.