// multi-utility computation suite · offline · instant · precise
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tool.solar-water-heater Calculator
Estimates the solar collector area needed to meet a target daily hot water demand from solar irradiance, collector efficiency, and demand temperature rise. A typical household needs 3–5 m² of flat-plate collector to cover 60–70% of hot water demand.
Inputs
Daily Hot Water L
Reference formula or conversion factor shown for context.
Inlet Temp C
Reference formula or conversion factor shown for context.
Target Temp C
Reference formula or conversion factor shown for context.
Solar Irradiance
Reference formula or conversion factor shown for context.
Results
heat energy needed (kWh/day)
The value at the specified point or condition.
collector area needed (m^2)
The computed two-dimensional surface area.
temperature rise (K)
The value at the specified point or condition.
annual savings vs electric
Total money or resources saved compared to the baseline or alternative scenario.
system payback est.
Reference formula or conversion factor shown for context.