()

- COP of electric boiler = 3.75 -

( ) (annual electricity consumption) ( ) (annual cost of electricity)

days (Annual hot water output) = 4500 kWh/day x 365 days = 1,642,500 kWh

( )

COP = Energy output/Energy input

(annual electricity consumption) = Annual hot water output / COP = 1,642,500 / 3.75 = 438,000 kWh

( ) ( ) ( ) (diesel price) x $5 = $ 2,190,000

Note : COP = Coefficient of performance