Dishwasher power in kW: definition, classes, tips for saving energy


The pow­er of mod­ern dish­wash­ers can range from 0.4 kW (class A+++) to 2.7 kW (class G). On aver­age, it is 0.7 kW (class A). Ener­gy con­sump­tion depends on the size of the wash tub, the amount of water used and heat­ed, the type of dish dry­ing and many oth­er fac­tors. Let’s deal with this option fur­ther.

What affects power?

Any dish­wash­er has devices that con­sume elec­tri­cal ener­gy. It:

  • Ther­mal elec­tric heater (TEN)heat­ing water. This is the main con­sumer of ener­gy in the dish­wash­er — its pow­er can reach 2.8 kW. Thus, the pow­er con­sump­tion of the device depends on two para­me­ters — on the pow­er of the heat­ing ele­ment itself and the need to use it. If the dish­es are greasy, they are dif­fi­cult to wash, so you need to heat a lot of water up to +65°C, and the pow­er con­sump­tion of the sink increas­es. If the dish­es are almost clean, you do not need to turn on the max­i­mum tem­per­a­ture — + 35 ° C will be enough.
  • Water pres­sure pump. As a rule, it has a pow­er of up to 100 watts. The pres­sure in the house plumb­ing sys­tem is usu­al­ly not enough to a lev­el suf­fi­cient for effi­cient dish­wash­ing. So, for the wash­ing process, you need to increase the pres­sure, which is car­ried out by the cir­cu­la­tion pump. In this case, every­thing is sim­ple — the longer the sink runs, the more ener­gy the pump motor uses. Depend­ing on the dura­tion of the select­ed pro­gram, the pow­er con­sump­tion will also change.
  • Water drain pump. The indi­ca­tor of its pow­er is approx­i­mate­ly 25–30 watts. After the clean­ing oper­a­tion is com­plet­ed, dirty water must be removed from the device. This work is per­formed by the drain pump.

Power consumption

So, the pow­er of a dish­wash­er depends on how much ener­gy its “com­po­nents” con­sume. Here it is worth con­sid­er­ing that in addi­tion to the main parts list­ed above, the unit may have addi­tion­al “com­po­nents” depend­ing on its char­ac­ter­is­tics.

In addi­tion, pow­er depends on such fac­tors:

  • Amount of water used. The lim­it val­ues ​​for a stan­dard wash­ing oper­a­tion are from 7 to 15 liters. Nat­u­ral­ly, the machine will be able to heat a small­er vol­ume of water to the required tem­per­a­ture twice as fast and twice as cheap.
  • The dura­tion of the wash­ing pro­ce­dure. The time inter­val can range from 40 to 260 min­utes. For most of this time, the pump will run on elec­tric­i­ty.
  • Wash Hop­per Size. Sinks come in two stan­dard sizes — 45 or 60 cm wide. Small­er sizes usu­al­ly mean less pow­er con­sump­tion.

So, many fac­tors deter­mine the pow­er con­sump­tion of the machine, so you need to take into account both its capa­bil­i­ties and the con­di­tions for its com­mis­sion­ing.

Power depending on the class of the device

Dish­wash­ers accord­ing to the lev­el of pow­er con­sump­tion are clas­si­fied into 7 groups, which are indi­cat­ed by let­ters of the Latin alpha­bet:

  • A. This is the high­est rat­ing, which means that the device has the low­est pow­er con­sump­tion — an aver­age of 0.7 to 1.05 kW.

Man­u­fac­tur­ers already pro­duce machines of the “A +” and “A +++” class­es, in which the con­sid­ered val­ue is up to 0.6 and 0.4 kW, respec­tive­ly.

  • B. They have indi­ca­tors from 1.07 to 1.1 kW.
  • C. They have pow­er from 1.1 to 1.5 kW.
  • D and E. Mod­els of this class have an aver­age rat­ing, since they con­sume more pow­er — from 1.5 to 2.3 kW.
  • F and G. Mod­els of this class are giv­en the low­est rat­ing, because they have a max­i­mum pow­er of up to 2.7 kW. As a rule, devices of this class include old devices.

economical car

So, class A cars are the most eco­nom­i­cal, and class G cars are the most waste­ful. How­ev­er, their prices are dis­trib­uted accord­ing to a dia­met­ri­cal­ly oppo­site prin­ci­ple: the more eco­nom­i­cal the device, the high­er the price.

It is also worth not­ing that dish­wash­ers are con­di­tion­al­ly divid­ed into 3 more class­es:

  • Basic Mod­els. Basic units usu­al­ly have a min­i­mum set of 4 pro­grams (pre-soak­ing + 3 degrees of pol­lu­tion), they do not have a dis­play, the noise lev­el is 47–50 dB.
  • func­tion­al mod­els. They have a large set of pro­grams, includ­ing “delayed start”, there is a dis­play. Built-in mod­els often have “hid­den” touch but­tons.
  • advanced mod­els. They are equipped with the largest selec­tion of pro­grams — from del­i­cate crys­tal to a greasy bak­ing sheet, door lock, enhanced pro­tec­tion against leaks, the “beam on the floor” func­tion (a sig­nal that the work is com­plet­ed), an ana­lyz­er of water hard­ness and sewage pol­lu­tion, a timer until the end of work. Noise at 42 dB.
Tips on how to choose a dish­wash­er for your home can be found here.

The num­ber of avail­able func­tions and, as a result, pow­er con­sump­tion depends on the class. How­ev­er, this does not mean that a high­er-end machine will always con­sume more pow­er. On the con­trary, many advanced wash­es do more oper­a­tions and may use less ener­gy.

Overview of the most economical cars

Among the wide vari­ety of mod­els, it is worth pay­ing atten­tion to class A, B or C dish­wash­ers, because they are the most ener­gy effi­cient. Although they are more expen­sive, the one-time over­pay­ment for a more eco­nom­i­cal machine is ben­e­fi­cial in the long run, since the reduced ener­gy con­sump­tion over time com­pen­sates for the high ini­tial costs.

The table of the most ener­gy-effi­cient mod­els looks like this:

Con­sumed water per cycle, l Pow­er con­sump­tion for the “Eco­nom­ic” pro­gram, kW (W) Con­nec­tion pow­er, kW (W) Num­ber of modes
ELECTROLUX ESL 2450W 7 0.63 (630) 1.8 (1180) four
AEG F55200VI0 7 0.63 (630) 1.2 (1200) 5
Elec­trolux ESF2450S 7 0.63 (630) 1.1 (1180) four
BOSCH SKS 51 E 12 7.5 0.62 (620) 1.2 (1200) 5

It is worth not­ing that of the mod­els pre­sent­ed, it is worth pay­ing spe­cial atten­tion to the Bosch brand device, because it was this com­pa­ny that brought dish­wash­ers with new tech­nol­o­gy to the mar­ket of house­hold appli­ances — built-in heat exchang­ers. The advan­tage of this tech­nol­o­gy is that it allows you to save ener­gy by work­ing as fol­lows:

  1. An addi­tion­al water tank is built into the low­er or side part of the machine, which has an adja­cent wall with the main wash­ing tank.
  2. At the begin­ning of the process, the tank is filled with cold water.
  3. At the same time, the wash­ing water is heat­ed by the heat­ing ele­ment to a tem­per­a­ture of about 65°C and begins to cir­cu­late in the main tank.
  4. Cold water in the heat exchang­er is also heat­ed through the adja­cent wall. Thus, hot water from the machine does not go direct­ly to the drains, but leaves a sig­nif­i­cant part of the heat.
  5. In the future, the sink rins­es the dish­es with warm water from an addi­tion­al tank, pro­long­ing the life of the ion exchang­er and leav­ing no streaks on the dish­es.

Economy dishwasher

But that’s not all. The heat exchang­er also helps to save ener­gy dur­ing the dry­ing process. At the end of the process, the so-called con­den­sa­tion dry­ing takes place:

  1. The addi­tion­al tank is refilled with cold water.
  2. Warm air in the main tank at this time is filled with steam, which con­dens­es (falls out in the form of dew) on the wall adja­cent to the heat exchang­er.
  3. Thus, it is not nec­es­sary to dri­ve dry hot air through the sink. Save ener­gy on heat­ing and ven­ti­la­tion.

Thanks to inno­v­a­tive tech­nol­o­gy, the aver­age out­put of a stan­dard Bosch dish­wash­er with a width of 60 cm is approx­i­mate­ly 0.5 kW.

Tips for reducing power consumption

There are rules for com­pe­tent oper­a­tion that allow you to save ener­gy:

  • Most dish­wash­ers have a half load mode. It is worth using it, because it saves about 25–30% of water and elec­tric­i­ty.
  • It is best to post­pone the wash­ing process until the evening or even at night. For exam­ple, dur­ing the day you can lay the dish­es and start the “delayed start” pro­gram. Cold water will be drawn into the machine, but wash­ing will not take place. In a few hours, the water will warm up to room tem­per­a­ture, and at night (when the elec­tric­i­ty tar­iff is low­er), the machine will turn on and work qui­et­ly.
  • Reg­u­lar­ly clean the heat­ing ele­ment of the wash­ing unit from scale. If it becomes cov­ered with a thick lay­er of min­er­al deposits, it will heat much worse and longer than nec­es­sary, and will con­sume a lot of excess ener­gy. How­ev­er, it may even fail due to over­heat­ing.
  • Do not allow food to dry out on plates. It is bet­ter to put them in a large con­tain­er with water, let them soak, and then you can wash every­thing at once.

So, it is impor­tant for the buy­er to decide on the pow­er of the dish­wash­er being pur­chased, because both a lack and an excess of pow­er are not an accept­able solu­tion. In our review, some sim­ple prin­ci­ples were revealed that will nar­row the search field and allow you to make the best choice.





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