Electric Water Heater: The Hidden Consumption that Inflates Your Bill in Spain

In the ongoing effort to reduce household electricity expenses, our attention often turns to the refrigerator, washing machine, or oven. However, a silent and largely invisible appliance is actually responsible for a significant portion of our increased electricity bill: the electric water heater. For property owners and buyers in Spain, understanding its operation and consumption is key to efficient energy management.

Unlike other appliances that only consume energy while in use, the electric water heater operates continuously. According to the Institute for Diversification and Energy Saving (IDAE), domestic hot water can account for up to 7.5% of a household's total electricity consumption. This percentage dramatically increases in homes where the electric water heater is the sole source of hot water. Its operational mode involves constant monitoring of the accumulated water temperature and automatic reactivation of the heating element whenever it detects a drop, resulting in uninterrupted energy expenditure.

The economic impact is considerable. An electric water heater can consume between 400 and 3,000 kWh annually. This translates to an approximate cost of 150 euros per year for a 30-liter model (for one person), about 370 euros for an 80-liter unit (three or four people), and close to 470 euros for a 100-liter unit (large families). Furthermore, thermal losses, even with taps closed, amount to between 1 and 2 kWh every 24 hours, a constant expense 365 days a year.

Owners, pay attention to these factors that multiply consumption: an inadequately sized tank (too large or too small), excessively high temperatures, or uninsulated pipes. To reduce costs without replacing the system, Casas Unitas recommends adjusting the temperature between 55 and 60 degrees, descaling the appliance regularly, taking shorter showers, avoiding completely filling the bathtub, and installing flow reducers.

For those looking to acquire property in Spain, the hot water system is a crucial detail. It directly impacts the home's energy efficiency certificate and, consequently, its monthly expenses. Investigating whether the property has more efficient systems like aerothermal or thermodynamic water heaters is a worthwhile investment of time that leads to long-term savings and a more informed and protected purchasing decision.