ASBC — Duchas
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Solar Shower Water Heating Calculator helps estimate the energy consumption needed to heat water for shower use. It works based on the formula: water (in liters) multiplied by the temperature variation (in degrees Celsius) and the factor 0.00116 kWh/L. This calculation provides an estimate of energy consumption in kilowatt-hours (kWh).
This calculator is useful for those considering installing solar heating systems in their homes or businesses. Solar heating is a sustainable and economical option for heating water, reducing dependence on conventional energy sources and contributing to the reduction of greenhouse gas emissions.
When using this calculator, it's essential to keep some precautions in mind. Firstly, it's crucial to have an accurate estimate of daily hot water consumption. Additionally, it's necessary to consider the average cold water temperature and the desired hot water temperature. These factors directly influence the calculation result and the choice of the suitable solar heating system.
With the calculator's result, it's possible to assess the feasibility of implementing a solar heating system and compare different equipment options and configurations to find the most efficient and economical solution for your needs.
Frequently asked questions
What units should I use for water and temperature?
Water should be entered in liters (L) and temperature in degrees Celsius (°C).
How do I get the value of 0.00116 kWh/L?
This value is a conversion factor that relates energy consumption to the amount of water and temperature variation. It may vary slightly depending on the units used and specific conditions of the heating system.
Can I use this calculator for other purposes?
Although the calculator is aimed at showers, the formula can be adapted for other hot water uses. However, it's essential to consider the particularities of each case.
How can I reduce energy consumption to heat water?
In addition to considering the use of solar heating systems, you can reduce energy consumption by taking shorter showers, regulating water temperature, and using efficient equipment.
Does the calculator consider the efficiency of the heating system?
No, the calculator provides a basic estimate of the necessary energy consumption. The efficiency of the solar heating system should be considered separately for a more accurate assessment.