Model a lower-flow shower using measured power
A household compares two electric-shower configurations at the same comfortable temperature. Sample average draws are 7,200 W and 5,400 W for ten minutes per day.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Power unit | W |
| Power | 7200 |
| Hours per day | 0.166666666667 |
| Days or equivalent sessions | 30 |
| Duty cycle (%) | 100 |
| Energy price (USD per input kWh) | 0.25 |
| Alternative power (W) | 5400 |
| Alternative hours per day | 0.166666666667 |
| Alternative duty cycle (%) | 100 |
Baseline: 7200 ÷ 1,000 × (10/60) × 30 × 100% = 36 kWh. Alternative: 5400 ÷ 1,000 × (10/60) × 30 × 100% = 27 kWh. Multiply both by 0.25; the baseline minus the alternative is USD 2.25.
Modeled difference · USD 2.25
What the comparison shows
At example flows of 8 and 6 L/min, the water difference is (8 − 6) × 10 × 30 = 600 L. If electrical power stays fixed after a flow change, the estimated electricity saving here would disappear.
Assumptions and limits
The power values are example measurements, not ratings inferred from the flow. Follow the shower manufacturer’s requirements for flow and compatible fittings, and model water separately.