WHY BUY GREEN-Y?

In the following the economical benefits for a customer living in a building with Green-Y are emphasized. There are four main scenarios depending on how the hot water for domestic use was provided and if a battery was used or not:

1. Green-Y instead of heat pump boiler + battery

  • Annual electricity bill unchanged
  • Savings at installation of up to 60%
  • Total savings after 15 years operation: 45%

 + 5'800 $

 


2. Green-Y instead of heat pump boiler

  • Savings at annual electricity bill of up to 80%
  • Amortization time of additional investment at installation: 3 years
  • Total savings after 15 years operation: 60%

 + 800 $/y

 


3. Green-Y instead of electric boiler + battery

  • Savings at annual electricity bill of up to 50%
  • Savings at installation of up to 40%
  • Total savings after 15 years operation: 45%

 + 3'300 $

+ 200 $/y

 


4. Green-Y instead of electric boiler

  • Savings at annual electricity bill of up to 85%
  • Amortization time of additional investment at installation: 5 years
  • Total savings after 15 years operation: 60%

+ 1000 $/y

 


Installation investments for the average household

Green-Y Size Specific Costs Costs
Power Unit 5 kWel   |   4.5 kWth 600 $/kWel 3'000 $
300l Watertank 20 kWhth 25 $/kWhth 500 $
Pressuretanks 14 kWhel 50 $/kWhel 700 $
TOTAL     4'200 $
Battery Size Specific Costs Costs
Power Unit 5 kWel 500 $/kWel 2'500 $
Capacity 14 kWhel 285 $/kWhel 4'000 $
TOTAL     6'500 $
Heat pump Boiler Size Specific Costs Costs
Heat pump 0.5 kWel   |   1.25 kWth 2'400 $/kWth 3'000 $
300l Watertank 20 kWhth 25 $/kWhth 500 $
TOTAL     3'500 $
Electric Boiler
 		Size Specific Costs Costs
Power Unit 5 kWel 100 $/kWel 500 $
300l Watertank 20 kWhth 25 $/kWhth 500 $
TOTAL     1'000 $

Annual electricity bill for the average household

Green-Y 200 $/y
Heat pump Boiler + Battery

200 $/y

Heat pump Boiler 1'000 $/y
Electric Boiler + Battery 400 $/y
Electric Boiler 1'200 $/y

Additional remarks

  • Installation costs of Green-Y correspond to the one of a heat pump + battery
  • The higher maintenance costs of Green-Y (pressuretanks) are more than compensated by the longer lifetime of the electricity storage (>20k cycles Green-Y vs. 4k cycles battery)
  • Photo-voltaic systems, which would further increase the economical benefit of Green-Y, were not considered here