Everyday
Calculation method and formula
L = Water per bath [l] × Baths per month; L ÷ 1000 × Water price per m³ + L × Hot-water share [%] ÷ 100 × Temperature rise [°C] × 0.001163 × Energy price per kWh
Understand the inputs
- Water per bath
- Unit: l. Use a measured value or your own assumption.
- Baths per month
- Minimum 1. Whole number.
- Water price per m³
- Use a measured value or your own assumption.
- Hot-water share
- Unit: %. Minimum 0. Maximum 100. Use a measured value or your own assumption.
- Temperature rise
- Unit: °C. Use a measured value or your own assumption.
- Energy price per kWh
- Use a measured value or your own assumption.
Assumptions and limitations
Water volumes are converted from litres to m³. Hot-water costs use theoretical heat energy; storage, pipe and heating losses are excluded. Enter your current tariffs.
The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.