Energy - Saving Calculation Of Heat Pump Water Heaters
       
ANNUAL HEATING EXPENSES - CALCULATION
Energy required to heat 1000 litres of water =
1000 lts x 30 deg C (temp rise) = 30,000 kcal = 35 KW

HEAT PUMP:
VCH10i Heat Pump Output = 11.2 KW
Time to heat 1000 litres = 35KW/11.2 KW = 3 hours

Heat Pump Input = 2.4KW x 3 hours = 7.2 units
Per annum cost = 7.2 units x 365 days x Rs.8 = Rs.21,000

DIESEL BOILER:
Diesel Calorific value = 9337 kcal per litre
To heat 1000 litres of water = 30,000 / 9337 = 3 litres
Per annum cost = 3 litres x 365 days x Rs.55 = Rs.60,000

ELECTRIC GEYSER:
Power consumed = 35 KW (or 35 units)
Per annum cost = 35 units x 365 days x Rs.8 = Rs.1,00,000
* Assumption : Commercial tariff at an average of Rs 8 per unit