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Solar Water Heater Calculator

Estimate daily hot water demand, heating energy, solar collector area, storage capacity and energy savings.

Hot Water Requirement
Nos.
L/day
L/day
Water Temperature
°C
°C
%
Solar & Collector Parameters
kWh/m²
%
%
×
days
Energy Cost
₹ /kWh
%
Years
Calculation Results
Daily Hot Water Demand
0 L/day
Recommended Tank Capacity
0 LPD
Daily Heating Energy
0 kWh/day
Required Collector Area
0 m²
Solar Energy Contribution
0 kWh/day
Estimated Annual Saving
₹0
Recommended Solar Water Heater

Enter the required values and calculate to obtain the recommended system size.

Temperature Rise 0 °C
Useful Heat Required 0 kWh/day
Heat Including Losses 0 kWh/day
Solar Energy Required 0 kWh/day
Annual Solar Energy 0 kWh/year
Equivalent Electricity Saved 0 kWh/year
10-Year Estimated Saving ₹0
Selected Collector Type -

Solar Water Heater Calculation

The calculator estimates the thermal energy required to raise the temperature of the required quantity of water and then determines the approximate solar collector area required to provide the selected solar contribution.

Heat Energy = Water Quantity × 4.186 × Temperature Rise
Collector Area = Solar Energy Required ÷ (Solar Radiation × Collector Efficiency)

Actual solar water heater sizing may vary depending on climatic conditions, orientation, shading, collector technology, piping losses, usage pattern and manufacturer specifications.