Installation
The regular way to install a water heater.
The choice for this parameter depends primarily on how much free space is available for installing the device and what shape this space has. Therefore, when there is a lot of space (for example, the user has an entire wall in the boiler room of a private house at his disposal), this parameter can be ignored. But in cramped conditions, each installation method will have its nuances.
—
Vertical. Vertical arrangement devices, elongated in height. This option is well suited for narrow cramped spaces — for example, a bathroom in a small city apartment.
—
Horizontal. The horizontal layout is less suitable for tight spaces than the vertical one but in some conditions, it may be optimal — for example, if the place under the device looks like a low horizontal niche. Also, note that many instant water heaters are produced in this design (see "Type") — they do not take up much space, and horizontal orientation is considered optimal for such devices for several reasons.
—
Floor. Floorstanding models (as opposed to all of the wall mount options described above). The main advantage of such an installation is simplicity: there is no need to drill walls and prepare other special fasteners; it is enough to have free space on the floor. In addition, weight restrictions are not so critical for floor water h
...eaters, and this method can be used even for the most powerful, capacious and, accordingly, large models. On the other hand, free space on the floor is not always available, and this installation method is not suitable for cramped conditions.
— Universal (wall mounted). Devices that can be placed in any position — both horizontal and vertical (see above for details). The advantage of this option is obvious: the user can choose the installation method of his choice, depending on the situation.Energy efficiency class
This parameter characterizes the efficiency of electricity consumption by the water heater. Classes are indicated by latin letters from A to G (
A,
B,
C,
D), where A is the most energy efficient device.
Power consumption
Electrical power consumed by the heater during operation.
This parameter is of key importance for electric models (see "Energy source"). In them, the power consumption corresponds to the power of the heating element and, accordingly, the heat output of the entire device. The overall efficiency and flow rate of the water heater directly depend on the useful power. Accordingly, high-flow rate models inevitably have high consumption. At the same time, we note that the heating power is selected by the designers in such a way as to guarantee the necessary flow rate and water temperature. So when choosing a device according to flow rate, you need to look primarily at flow rate and temperature. Power must be taken into account when connecting: for example, if a 220 V model (see "Power source") consumes more than 3.5 kW, it, as a rule, cannot be plugged into a regular outlet — connection is required according to special rules. And the most productive and high-powered models — 10 kW or more — are connected only to three-phase mains.
The power consumption has a similar value for combined boilers — adjusted for the fact that in them the electric heater is an additional source of heat. For gas and indirect models, this parameter describes the power consumption of control circuits and other auxiliary structural elements; this power consumption is usually very small — on the order of several tens of watts, less often up to 1.5 kW.
Performance (Δt ~25 °C)
Water heater performance when heating water by approximately 25 °C above the initial temperature.
Performance is the maximum amount of hot water the unit can produce in a minute. It depends not only on the power of the heater as such, but also on how much water needs to be heated: the higher the temperature difference ΔT between cold and heated water, the more energy is required for heating and the smaller the volume of water with which the unit can handle in this mode. Therefore, the performance of water heaters must be indicated for specific options ΔT — namely 25 °C, 40 °C and/or 50 °C. And it is worth choosing according to this indicator taking into account the real needs for hot water: exactly how much and what temperature is needed for a particular situation. Methods of such calculations can be found in special sources.
Recall that water begins to be felt by a person as warm somewhere from 40 °C, as hot — somewhere from 50 °C, and the temperature of hot water in central water supply systems (according to official standards) is at least 60 °C. Thus, at Δt~25°C, for heating to at least the same 40°C, the initial water temperature must be at least 15°C (15+25=40°C). This is a rather high value — for example, in a centralized water supply system, cold water reaches 15 °C, except in summer, when the water pipes warm up noticeably; the same applies to water supplied from wells. So in the “Δt ~ 25 °C” mode, modern water heaters work quite rarely — eithe...r if the initial water temperature is high enough, or if it does not need to be heated much. Most often, the degree of heating is much higher, and the performance is lower. Nevertheless, data for a given degree of heating is still often given in the characteristics — including for advertising purposes, since with a low ΔT, the performance figures are quite impressive. In addition, this information can be useful in fact — for the situations mentioned above, when heating by 25 °C is quite enough.
Tap
The presence of its own tap in the design of the water heater. In such models, the nozzle is attached to the body. This feature is typical mainly for instant heaters (see above); it allows you to do without buying a separate tap for hot water.
Shower head
Nozzle designed, by the name, to supply warm water to the shower. It is a complete shower hose with a shower head. Such a shower head differs from a conventional shower in a smaller width of the holes — this is done to create sufficient pressure at a low power of the water heater.
Shower heads are mainly equipped with tankless models (see "Water heater type"), but this feature is extremely rare in storage models: it is assumed that it is more convenient to connect a heater with a tank to standard equipment in the bathroom.
Weight
The weight of the device, excluding the water collected (passing) into it.
