Choose a shower that uses less water than a bath
Why this can help
A shower uses less water than a bath only when its flow multiplied by duration is lower than the bath volume. Less heated water can also reduce heat demand.
One possible next step
Measure shower flow and duration, then compare their product with the bath volume you actually use.
What changes the outcome
A long or high-flow shower can use more. Compare the actual bathing routine, including any bathwater already shared appropriately; preserve comfort and accessibility.
Your illustrative scenario
Over one year · with the assumptions below
You
3,600 litres of water used less
You + 10 friends
39,600 litres of water used less
1,000 participants
3,600,000 litres of water used less
Each participant repeats your scenario. This is hypothetical participation, not measured collective savings.
Your inputs
- Bath water per person
- 100 L
- Shower flow
- 8 L/min
- Shower duration
- 8 min
- Comparable occasions per year
- 100
Calculation of the difference: (100 L − 8 L/min × 8 min) × 100 = 3,600 litres of water used
Calculation boundaries
Only fresh water used for the same service is counted. Include rinsing and repeated attempts. Heating, water treatment and carbon emissions are outside this account. A long or high-flow shower can use more. Compare the actual bathing routine, including any bathwater already shared appropriately; preserve comfort and accessibility.
The initial values are editable arithmetic examples, not measurements or typical savings from the cited studies. Replace them with comparable readings for your situation. The sources support the mechanism and its conditions; they do not predict these numbers.
Sources and calculation references
- EnergieSchweiz — Uso efficiente dell’acqua caldaEnergieSchweiz
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