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Choosing an electric water heater

Electric storage water heaters equip a large majority of French homes. It is a large insulated tank that can hold between 50 and 300 liters of water. They are heated with electrical resistance and regulated by a thermostat. However, not all electric water heaters are the same. That's why, at the beginning of winter, HandymakerDuanche offers you to discover the criteria to take into account in order to choose an electric cumulus perfectly adapted to your needs.


Choose the resistance of an electric water heater.

Resistance is one of the major elements of a water heater, so it must be selected carefully. There are two main families of resistors, thermoplong resistors and steatites. The immersion models are immersed in the tank. Thus positioned, they can warm the water quickly. On the other hand, they are easily scaled and therefore require a binding interview. The steatite water heaters have a protected resistance in an enamelled steel sheath. Thus, it is not in direct contact with water which limits the problems of limestone. In addition, there have been for some years ACI steatite resistors reinforcing the protection of the tank against corrosion with a titanium Anode. To know that if your water is of limestone nature, it is better to opt for a steatite model.

Choose the tank of an electric water heater.

The size and especially the capacity of a water heater must be chosen according to the available space and its configuration, but especially according to the needs of the housing. In theory, it is necessary to envisage an average daily consumption of thirty to forty liters of hot water per person. In practice, the volume of the water heater also depends on the use that is made of it, that is to say the number of sanitary equipment, their function and attendance. It must also depend on the number of rooms that make up the housing as specified in the Promotelec standard. Thus, to feed a washbasin, with normal use, a model of 30 liters will suffice. While to feed a shower and a bath it will provide a tank that can contain between 100 and 150 liters.

When buying the water heater, you will have the choice between models to ask or suspend. If you opt for a hanging model, make sure your walls can support its weight. By the way, according to our plumber: "the accumulation of fastening systems can not be an evil... "

The practical electric water heater:

hot bath

The installation of an electric water heater is accessible to the majority of the do-it-yourselfers, provided however to respect certain rules and to respect strictly the indications of the supplier. To prevent heat loss, the appliance must be installed in a heated or insulated room. In addition, isolating the associated piping will allow a significant performance gain. If the water heater is in a water room, then it will be necessary to respect the safety distances imposed by the electrical standard. On the other hand, the entire electrical installation that supplies the water heater must comply with the electrical standard NF 15 100. For example, the plug of the water heater must be connected to the ground. Finally, it is necessary to install a safety group on the cold water inlet to secure the possible overpressure due to the heating and a "di-electric" connection on the hot water outlet; this in order to avoid the phenomena of electrolysis. A pressure reducer is also necessary if you do not already have one at the top of your installation.

As for the maintenance of electric water heaters, it consists of operating the safety group's drain lever about once a month to ensure that it operates correctly. In the case of water heaters with immersion resistance you will also have to proceed after a few years to descaling the resistance.

Finally to conclude this article, HandymanDuanche invites you to consult his DIY sheet to learn how to descale an electric water heater


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