Many water heaters are economical, reliable, safe — in a word, they are good for everyone, but you won’t be able to use them quickly. Geysers, for example, require coordination, and in some cases, modernization of the premises — this is not a quick matter. Flowing water heaters consume a large amount of electricity, which is not always enough. What option can be used quickly and without unnecessary hassle? Most often, if urgent installation and connection is necessary, low-power instantaneous water heaters or compact storage water heaters are chosen (we will only talk about electric models, gas ones, as mentioned above, will most likely not be connected quickly).
Instantaneous water heaters
You should choose those that have enough power for your power supply. The estimated connection power can be obtained from the company responsible for the operation of your home. As a rule, in city apartments without electric stoves, you can easily connect an instantaneous water heater with a power of 3.5–4.5 kW, in houses with electric stoves — up to 5–8 kW. Outside the city, the situation may be different. In old villages and summer cottages, there may be outdated electrical networks, to which it is impossible to connect a load with a power of more than 2.5–3.5 kW (in such a situation, it is better to refuse the flow). In new settlements, electricity consumption rates per household can be significantly higher, up to 15–20 kW;
Relatively low-power models with a power of up to 3–3.5 kW are connected very simply, like ordinary electrical appliances — to a standard 220 V power outlet. Of course, you won’t get a lot of hot water with their help, you won’t take a bath or shower. Therefore, they are most often used in the kitchen. Fortunately, these compact devices require very little free space (much less than any boiler).
On sale there are models installed both under the sink and above the sink — choose the modification that you like best. There are also very compact models, made in the form of a nozzle on a crane.
More powerful instantaneous water heaters require separate wiring, just like an electric stove or washing machine. This separate branch must be equipped with an RCD that protects users from electric current leakage. These water heaters must be connected by a qualified electrician.
The main problem of boilers is their overall dimensions, which in the case of a capacity of 80–100 liters will be very impressive. Determine in advance where you can place the boiler — taking into account the rules of the PUE (for example, you cannot place electrical appliances above a bathtub, sink, shower cabin or toilet bowl; the distance from the bathtub, sink, shower cabin or toilet bowl to the water heater must be at least 1 m in order to the user, being in that bathroom, could not reach the electrical appliance).
A good place for a boiler is the space in the bathroom above the door. There is usually enough space to accommodate even 100-litre tanks. For convenience, manufacturers specifically produce water heaters that are designed for horizontal installation.
Do not forget that the storage water heater in the state filled with water will be very heavy and not every wall can withstand it.
When it comes to limescale protection, you don’t need any special frills if you are going to use the boiler for only a few days a year. Even standard protection (magnesium anode) will last for many years of operation in this mode.