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Energy Savings Chart for Bosch Tankless Water Heaters

Gas Energy Factor Annual Cost
to Operate*
Annual
Savings(1)
Annual
Savings(2)
Natural Gas
635 ES/ESO 0.85 $250 $110 $151
425 HN/HNO 0.80 $266 $95 $135
425 EF 0.78 $273 $88 $129
40-gallon tank 0.59 $361    
75-gallon tank 0.53 $410    
Liquid Propane
635 ES/ESO 0.86 $355 $163 $221
425 HN/HNO 0.84 $364 $154 $213
425 EF 0.81 $377 $141 $199
40-gallon tank 0.59 $518    
75-gallon tank 0.53 $577    
Electric Energy Factor Cost to Operate** Annual Savings(3) Annual Savings(4)
RP17PT 0.90 $478 $0 $22
RP27PT 0.94 $458 $20 $43
50-gallon tank 0.90 $478    
80-gallon tank 0.86 $500    

 

*The above charts represent approximate energy savings figures based on U.S. Dept. of Energy test method for water heaters. The energy costs used are the 2006 averages as published by DOE - $1.42/therm for natural gas and $1.95/gallon for propane.

Annual Savings(1) - Compared to a new 40-gallon tank water heater of the most popular model.

Annual Savings(2) -Compared to a new 75-gallon tank water heater of the most popular model.

**The above charts represent approximate energy savings figures based on U.S. Dept. of Energy test method for water heaters. The energy costs used are the 2006 averages as published by DOE - $0.098/kWh.

Annual Savings(3) - Compared to a new 50-gallon storage tank with Energy Factor .90 (most popular model).

Annual Savings(4) - Compared to a new 80-gallon storage tank with Energy Factor .86 (most popular model).

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Information Source: Bosch Water Heating

 


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