How to choose an electric water heater

The first factor to consider when deciding on an electric water heater is its water capacity. Keep in mind that the water consumption of an average user is close to 60 litres per day.

Unlike instant water heaters, which, as their name suggests, instantly heat the water, electric water heaters store it in a tank. For this reason, we should be aware of our real needs in terms of supply.

• Water heaters with a 10 to 15-litre capacity provide readily available hot water in small quantities, like those necessary for a wash-basin or a sink. Their small size makes them suitable for installation in any space.
• Water heaters with a capacity of between 30 and 50 litres are adequate for supplying hot water to a single shower, as in one-person households.
• An 80-litre water heater is suitable to meet the needs of a household with two people.
• Water heaters with a tank capacity of between 100 and 150 litres are appropriate for three-people households, where there is a simultaneous or consecutive use of hot water.
• Water heaters with a capacity of between 200 and 300 litres are suitable for single-family homes, and establishments with high water consumption.
• Heaters with a 500-litre capacity will suit the needs of a family of seven or eight. They are also adequate for industrial use.

Time is another element that should be considered. Will the household require hot water to be supplied simultaneously or consecutively? Or will there be time intervals between uses?

The type of resistor used in the water heater will determine its time of use. A shielded resistor will raise the water temperature at a faster pace, as it is actually in contact with water. This contact, however, may lead to issues regarding corrosion and lime and rust accumulation within a shorter time. Meanwhile, sheathed heating elements do not directly touch water and can be replaced without emptying the tank.

Installation of an electric water heater only requires an electrical connection. Take into consideration the heater's position and the required space for its installation. The water heater's installation may be wall-mounted, either in a horizontal or a vertical position, or floor-standing with feet, where they are vertically positioned.