5.4 : Water Heaters




5.4.5 Water Heater Efficiencies
2005 2010
Efficiency Stock Minimum Best-Available
Residential Type Parameter (1) Efficiency New Efficiency New Efficiency
Electric Storage EF 0.90 0.90 (2) 0.95 (2)
Electric Instantaneous EF 0.82 0.82 0.98
Electric Heat Pump EF 2.00 2.00 2.35
Gas-Fired Storage EF 0.60 0.59 (3) 0.85 (3)
Gas-Fired Instantaneous EF 0.82 0.82 0.98
Oil-Fired Storage EF 0.50 0.53 (4) 0.68 (4)
Solar SEF 2.50 N.A. 2.50
2007 2010
Efficiency Stock Minimum Best-Available
Commercial Type Parameter (1) Efficiency New Efficiency New Efficiency
Electric Storage Thermal Efficiency 0.98 0.98 (5) 0.98 (5)
Electric Instantaneous Thermal Efficiency 0.98 0.98 0.98
Gas-Fired Storage Thermal Efficiency 0.78 0.80 (6) 0.96 (6)
Gas-Fired Instantaneous Thermal Efficiency 0.77 0.80 0.85
Oil-Fired Storage Thermal Efficiency 0.79 0.78 (7) 0.85 (7)
Note(s): 1) EF = energy factor and SEF = solar energy factor, which is the hot water energy delivered by the solar system divided by the electric or gas energy input to the system. 2) Based on a 50-gallon tank. 3) Based on a 40-gallon tank. 4) Based on a 30-gallon tank. 5) Based on a 120-gallon tank. 6) Based on a 100-gallon tank. 7) Based on a 70-gallon tank.









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Sources:

EIA, EIA - Technology Forecast Updates – Residential and Commercial Building Technologies – Reference Case, Oct. 2011