Comparison Maltec DH-800 vs Deerma DEM-CS50M

— Condensation. Models that operate on the principle of an air conditioner — excess moisture is removed by condensing water vapor. For this purpose, the design of such dehumidifiers includes an evaporator and a condenser, and a refrigerant circulates along the system circuit. The device forcibly draws in moist air from the room and directs it through the evaporator, where the flows are cooled to the dew point and condensate falls out. The collected moisture is sent to a special tank or discharged through drainage. At the next stage, the fan in the dehumidifier design drives air weight through the condenser, which warms them up a little and discharges dry, warm air outside. The vast majority of household models belong to the category of condensation dehumidifiers.

— Thermoelectric (Peltier). Dehumidifiers with thermoelectric plates in the design — the so-called "Peltier elements". When applying constant voltage to such a plate, one side of it heats up, and the opposite side becomes cold. Water vapor from the air condenses on the cold side, and the dried air heats up on the hot side. The condensate flows into a special container. Dehumidifiers with Peltier elements have a compressor-free design and are intended for drying small "square" rooms.

— Adsorption. A specific type of dehumidifier that uses the so-called adsorption technology — absorption of mois...ture from the air by a special absorbent substance. This is how adsorption devices differ from other types of dehumidifiers that use the principle of moisture condensation on cooled surfaces. The technology is quite expensive, but it allows operation in a wide range of temperatures, including subzero. Such units are indispensable in refrigeration and freezing chambers, at some stages of chemical production, indoor ice stadiums and in other specific conditions for which condensation models are unsuitable.

The nominal capacity of the dehumidifier is the maximum amount of moisture that the unit can remove from the air per day.

For efficient operation, the capacity of the dehumidifier must be no less than the amount of excess moisture that accumulates in the room during the same time. This amount can be calculated using special formulas or calculator programs. However, the results of such calculations are quite approximate, but they can be used in the selection, and for a full guarantee it is worth taking a performance margin of at least 10–20%. If desired, this margin can be more; but note that high performance significantly affects the price, dimensions and energy consumption of the dehumidifier.

Power consumption of the dehumidifier in normal operation.

From a practical point of view, this characteristic is secondary — manufacturers select power in such a way as to provide the necessary operating parameters (performance, air flow, etc.), and when choosing, you should focus primarily on these parameters. However, certain practical points also depend on the power consumption. Firstly, only models of less than 3-3.5 kW can be connected to ordinary household outlets; higher power consumption will require either a 400 V supply (see Power supply) or a direct connection to the panel. However, even power of more than 2 kW is rare in modern dehumidifiers — for most of these devices, the energy consumption is in the range from 500 to 1000 W or from 1000 to 2000 W, and in the most modest models it does not exceed 500 W at all. Secondly, power data may be required to calculate the load on the power grid. Such a need arises mainly for the selection of additional equipment — circuit breakers, AVR, UPS, etc.

Also, note that models with similar performance may differ in power consumption. However, a more economical dehumidifier often costs more, but with regular use, this difference pays off by reducing energy costs.

A very conditional parameter that slightly characterizes the purpose by the size of the room. And depending on the height of the ceilings, layout, structure of the building and equipment, the actual values ​​​​may differ significantly. Nevertheless, this item represents the maximum recommended area of ​​​​the room that this model can effectively serve: the use in smaller rooms is quite acceptable, but the device simply does not have enough performance for a larger space. Also, note that the area is indicated based on a ceiling height of 2.5-3 m — the standard value for residential premises; with a higher ceiling height, the effective area decreases, and it can be recalculated using special formulas.

When choosing by area, it is worth taking a certain margin, but it should not be too large — otherwise, the device will be unnecessarily powerful, bulky and expensive.

The range of relative humidity (RH — relative humidity) of the ambient air, in which the dehumidifier is guaranteed to be able to cope with its task and at the same time perform at the level claimed by the manufacturer.

The wider this range — the more versatile the unit, the less likely it is to be in emergency conditions. At the same time, when choosing, it is worth considering the specifics of the application of the dehumidifier. Thus, dehumidifiers are initially designed for high humidity, but the ability to work at 100% relative humidity is not always required. For example, in the cold season, the air coming from the street is "drier" by itself when heated indoors (due to the increase in temperature, the relative humidity drops, although the actual amount of moisture in the air does not change), and even in wet weather, a dehumidifier with a limit of 80-90% may be enough. And the lower dehumidification limit directly depends on the tasks facing the device. If we are talking about living quarters, offices and other places where you need to create conditions that are pleasant for people, then you need to take into account that the most comfortable values for a person concerning humidity are 40-70%. Therefore, for such conditions, it makes no sense to specifically look for a device with a lower limit of less than 40%. But for specific tasks such as drying rooms during repairs, warehousing, etc. lower humidity levels may be needed.

Note that many model...s are quite capable of working outside the operating range, except that the performance may decrease. However, it does not hurt to clarify such an ability according to the official documentation.

The ambient temperature range in which the dehumidifier can operate normally. The wider this range, the more versatile the dehumidifier is, and the more diverse the conditions in which it can be used. Note that, in contrast to the humidity range (see above), going beyond the operating temperatures is fraught not only with loss of efficiency but also with serious malfunctions and even breakdowns. Therefore, it is worth choosing a unit according to this parameter in such a way that it is guaranteed to block possible fluctuations in the temperature of the air with which the dehumidifier is to work.

Note that most modern models are designed to operate at positive temperatures, with the lower limit being on average about 4–5 °C. The only type of dehumidifiers that can operate at temperatures below zero are adsorption dryers(see "Suitable for").

The volume of the tank for collecting condensate (moisture removed from the air), provided in the design of the dehumidifier.

The larger the condensate tank, the slower it will fill up and the less often it will have to be emptied. It is especially important for high-performance units (see above). On the other hand, the volumetric tank has the appropriate dimensions, which affects the dimensions of the entire dryer. When evaluating the relationship between tank capacity and dehumidifier performance, note that the device rarely operates at full capacity. See "Dehumidification capacity" for more on this; here we note that if, for example, a dehumidifier with parameter of 24 L/day has a tank of 4 litres, this does not mean that the tank will necessarily be filled to the top every 4 hours. An alternative to tanks is the use of permanent condensate drainage systems; see "Features" for details.

— Hygrostat. An automatic regulator that allows you to maintain a certain humidity in the room. Such a regulator constantly monitors the amount of moisture in the air and turns on the dehumidifier if this amount exceeds the set value, and when the humidity drops to the desired value, it turns off the unit. The hygrostat is especially convenient in those cases when it is necessary not to dry the air as much as possible, but simply to lower the humidity to a certain level. And since dehumidifiers are most often used precisely for such tasks, this function is also very popular in them — it is available in most models, regardless of the purpose.

— Fan speed adjustment. A regulator that allows you to change the speed of the fan built into the dehumidifier — and, accordingly, the actual value of the air flow (see above). This function allows you to adjust the air flow value — and therefore the performance of the unit — to the specific situation. For example, when there are a lot of people in the room, it makes sense to increase the speed; and if there are few or no people at all, you can reduce the fan speed, reducing power consumption and wear on the unit.

— Night mode. Special operating mode designed for night time. Usually, in this mode the device reduces the fan speed, thereby reducing noise.

— Ionizer. Ions...are electrically charged molecules. It is believed that the presence of negatively charged ions in the air has a beneficial effect on the health and general well-being of a person. To saturate the air with such ions, ionizers are used in dehumidifiers.

— Shutdown timer. The presence of a timer in the dehumidifier that turns off the device after a certain time set by the user. This function allows you to leave the dehumidifier on without worrying about its timely shutdown — this will happen automatically after the specified time has elapsed. The timer is indispensable in cases where you need to leave the room being dried, but there may not be an opportunity to return and turn off the dehumidifier manually — for example, if you need to close the pool at night, and the air humidity is still too high.

— Anti-freeze mode. A function that prevents excessive cooling of the dryer parts and the formation of a large amount of ice on them. Recall that all modern dehumidifiers (except for adsorption ones, see "Suitable for") have refrigeration systems — to remove excess heat generated during humidity concentration. In some cases, individual components of such systems can cool down strongly (down to sub-zero temperatures), which is undesirable both in itself and due to the formation of ice. To avoid this, the anti-freeze system constantly monitors the state of the evaporator and, if necessary, turns on the heating, preventing a critical drop in temperature and removing the ice that has formed.

— Drying clothes (turbo mode). The intensive air dehumidification mode with maximum performance of the device will come in handy when drying clothes and linen. It helps remove excess moisture during frequent washing. This ensures dehumidification without controlling the humidity level using a hygrostat (see the corresponding paragraph).

— Air filter. Built-in air filter, thanks to which the dehumidifier can further clean the air during operation. Note that the efficiency of such filters can be different — from the simplest systems for trapping dust and other mechanical contaminants to charcoal elements that can even cope with odours. This nuance, as well as the features of filter maintenance, should be clarified separately.

— Filter indicator. Indicator signalling the need to replace the working element in the air filter. Without timely replacement of consumables, the filter at best loses its efficiency, at worst it increases the load on the dehumidifier, or even starts releasing substances into the air instead of trapping them. Replacement indicators may differ in functionality. However, this function significantly reduces the likelihood of missing the next filter maintenance period.

— Tank indicator. An indicator showing the amount of water in the condensate collection tank. The simplest version of such an indicator is a transparent insert in the tank wall, which allows you to monitor the amount of water without opening the tank once again; there are also more advanced systems, up to electronic sensors with display readings. However, anyway, the tank indicator makes it much easier to keep track of the amount of water and reduces the likelihood of missing a critical fill level.

— Auto shutdown. A system that monitors the amount of water in the condensate tank and automatically switches off the dehumidifier when this amount reaches a critical value. It avoids both floods and breakdowns of the unit itself.

— Drainage. Possibility of permanent removal of water, "extracted" from the air, outside the device (for example, directly to the street through a special tube). It allows you to simplify the cleaning of the water tank or do without it at all, which has a positive effect on the dimensions and weight of the dehumidifier. In addition, it makes it possible to work almost continuously, without interruptions to empty the tank with collected water, which is especially important for models used in swimming pools (see "Suitable for").

— Drain pump. Pump for forced drainage from the water tank. Often, the presence of a pump is justified in industrial dehumidifiers, when it is necessary to organize the removal of drainage on an ongoing basis (including, if necessary, its removal to a height of up to several metres).