Shower Cost Calculator

The cost of a shower is the water used plus the energy to heat it. A typical 8-minute shower with a 12 l/min head uses about 96 litres: with water at €2.2/m³ and gas at €0.10/kWh it costs roughly €0.40-0.50 per shower. With a high-flow head or longer showers the cost rises quickly.

It depends on the showerhead flow and the duration. Flow ranges from about 6 l/min (eco head) to 18 l/min (high flow); the standard is about 12 l/min. An 8-minute shower therefore uses between 48 and 144 litres. To estimate the litres just multiply the minutes by the litres per minute.

Usually the shower wins: a bath needs on average 120-180 litres of hot water, while a short shower with an eco head can stay at 40-60 litres. You pay the difference twice, on the water and on the energy to heat it. A bath becomes competitive only with very long showers and high-flow heads.

The three most effective steps are: fit a low-flow showerhead or a flow reducer/aerator (it can halve consumption), take shorter showers and turn off the water while soaping, and lower the water heater to 38-40°C. Fixing leaks and maintaining the water heater (descaling) also help keep consumption down.

Yes: an eco showerhead cuts the flow from about 12 to 6 l/min while keeping good pressure thanks to aeration, so it halves both the water and the energy to heat it. It costs a few euros and pays for itself in a few weeks in a family home. It is one of the best cost-to-saving upgrades.

For the same heat produced, heating water with gas almost always costs less than with electricity: in Italy gas is about €0.10-0.13/kWh of heat, while electricity is around €0.25-0.30/kWh. A heat-pump water heater is even more efficient because it produces 3-4 kWh of heat per kWh of electricity, offsetting the higher cost of power.

Domestic hot water (showers, sinks, washing) is one of the heaviest items in home energy use: after heating, it can account for 15-25% of a household's gas or electricity use. Showers are the main part, which is why acting on flow, duration and temperature has a real impact on the bill.

The shower usually wins: a bath takes 120 to 180 litres of hot water, while a short shower with an eco head can stay at 40 to 60. You pay the difference twice, on the water and on the energy that heats it.

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