Solar Water Heater Calculator
Calculate the right solar water heater size for your household. Enter family size, daily usage, and climate zone to get recommended tank size, collector area, and energy savings.
๐ Solar Water Heater Calculator
System Sizing
Daily Hot Water Need200 liters
Recommended Tank200 liters
Collector Area4 sq m
Solar Fraction70 %
Energy Savings
Daily Savings7.0 kWh
Annual Savings2,555 kWh
Financials
Estimated System Costโน20,000
Annual Monetary Savingsโน20,440
Payback Period1.0 years
How Solar Water Heaters Work
Solar water heaters use flat plate collectors or evacuated tube collectors (ETC) to absorb sunlight and heat water stored in an insulated tank. They can provide 60โ85% of a household's hot water needs, dramatically reducing electricity or gas bills.
System Types
| Type | Efficiency | Cost | Best For |
|---|---|---|---|
| Flat Plate (FPC) | 60โ70% | โน15,000โโน25,000 per 100L | Year-round hot climate |
| Evacuated Tube (ETC) | 70โ85% | โน10,000โโน18,000 per 100L | Cold/cloudy climates |
Sizing Guide
| Family Size | Daily Hot Water | Recommended Tank |
|---|---|---|
| 2 persons | 80โ100 liters | 100 liters |
| 3โ4 persons | 150โ200 liters | 200 liters |
| 5โ6 persons | 250โ300 liters | 300 liters |
| 7โ8 persons | 350โ400 liters | 500 liters |