Solar vs Electric Heaters
A 100 litre capacity SWH has the life of anywhere between 15-20 years. It can replace an electric water heater for residential use and can save upto 1000 units of electricity annually.
A 100 litre capacity Solar Water Heater costs around Rs. 21,000 and the payback period is approximately 4-5 years keeping in view the present power tariff, which means after this period, your hot water is FREE translating to big savings. By using a 100 ltr capacity SWH, you can prevent the emission of upto 650 kgs of carbon dioxide per year.
So make sure you switch to bigger savings and a cooler planet.
| Electric Water Heaters | Solar Water Heaters | |
|---|---|---|
| Capacity (litres) | 20 | 100 |
| Electricity used per Hour (Wattage) | 2000 | 0 |
| Average Hours of Electricity used per Year | 400 | 0 |
| Life of Unit (years) | 10 | 15 |
| Average Hours of Electricity used in 10 years | 4,000 | 0 |
| Electricity Used in 10 years (Kwh) | 8,000 | 0 |
| Electricity Cost (@ Rs. 5.00* /Kwh) | 40,000 | 0 |
| Cost of Unit | 4,000 | 21,000 |
| Total Cost (Electricity + Unit) for 10 yr period | 44,000 | 21,000 |
Total Savings in using a solar water heater = RS. 23,000 or 52% (for 10 years).
• Current national average power tariff