The water heater ensures that hot or hot water is always available in the bathroom or in the kitchen. With the help of energy, the water can be heated to a desired temperature.
In the meantime, a water heater has only a very low power consumption, so that it can be used excellently in the bathroom and kitchen. A water heater with at least 200 watts and easy operation is best suited.
 1,5Excellent Instantaneous water heater STIEBEL ELTRON DHE 18 / 21 / 24 SL electronic instantaneous water heater
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 1,7good Instantaneous water heater STIEBEL ELTRON DEL 18 / 21 / 24 SL, electronic instantaneous water heater
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 1,8good Instantaneous water heater AEG 228841 DDLE EASY electronic instantaneous water heater flameproof
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 1,9good Instantaneous water heater Siemens electronic instantaneous water heater, DH24400M
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 2,2good Instantaneous water heater Siemens electronic instantaneous water heater DH21400M
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| Name | Instantaneous water heater STIEBEL ELTRON DHE 18 / 21 / 24 SL electronic instantaneous water heater | Instantaneous water heater STIEBEL ELTRON DEL 18 / 21 / 24 SL, electronic instantaneous water heater | Instantaneous water heater AEG 228841 DDLE EASY electronic instantaneous water heater flameproof | Instantaneous water heater Siemens electronic instantaneous water heater, DH24400M | Instantaneous water heater Siemens electronic instantaneous water heater DH21400M |
| Price | Check price | Check price | Check price | Check price | Check price |
| comparison result Note on the comparative grade |
The Best Suggestionstest-vergleiche.com1,5ExcellentHeater |
TOP Productstest-vergleiche.com1,7goodHeater |
Best Performance test-vergleiche.com1,8goodHeater |
TOP Productstest-vergleiche.com1,9goodHeater |
TOP Productstest-vergleiche.com2,2goodHeater |
| Manufacturers | Stiebel Eltron | Stiebel Eltron | AEG | Siemens | Siemens |
| Temperature range | steplessly adjustable from 20 to 60 ° C | steplessly adjustable from 20 to 60 ° C | 42 ° / 55 ° C | 38 ° / 60 ° C | 38 ° / 60 ° C |
| Power consumption | 18 / 21 / kW 24 | 18 / 21 / kW 24 | 21 kW | 24 kW | 21 kW |
| Weight | 4,8 kg | 3,1 kg | 3,6 kg | 3,3 kg | 3,3 kg |
| Dimensions | 47,8 x 22,5 x 10,5 cm | 47,8 x 22,5 x 10,5 cm | 48,5 x 22,6 x 9,3 cm | 47,2 x 23,6 x 13,9 cm | 47,2 x 23,6 x 13,9 cm |
| steering | electronically regulated | electronically regulated | electronically | hydraulic | hydraulic |
| flameproof | |||||
| Features | Solar suitable, bubble detection | switchable | Over or under table mounting possible | Inexpensive in purchase, not suitable for every area | Inexpensive in purchase, not suitable for every area |
| Benefits |
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| Conclusion | 4i technology for maximum energy efficiency and always accurate temperature and limitless premium comfort | 3i technology for exact desired temperature for high comfort | Energy-saving instantaneous water heater for the normal user | Instantaneous water heater, hydraulically controlled by applied water pressure | Instantaneous water heater, hydraulically controlled by applied water pressure |
| To the Amazon offer |
Our comparison chart for Instantaneous water heater comparison does not replace one Instantaneous water heater testin which a special Water heater test winner can be recommended. In order to increase the added value for our readers, we may link to an external instantaneous water heater test of trustworthy sources. Only you decide which model your personal Water heater test winner is.
It is a big misconception that instantaneous water heaters with a high connected load are power guzzlers. Quite the opposite is the reality. Heating a liter of water requires a certain amount of heat. It does not matter whether it is obtained on the stove, in a kettle or in a storage heater. The amount of heat always remains the same. While the boiler (boiler) heats a certain amount of water, it has to store it until the warm water is called. This creates memory losses through the insulation and losses over the lines to the sampling point. The best water heater can be mounted directly next to the shower and if they are electronically controlled, they will not even have a cold water loss before the right temperature is reached. However, there are major differences between hydraulic, electrical and electronically controlled instantaneous water heaters. Before it arrives at the water heater, ours should arrive Water heater report from Test-Vergleiche.com bring closer.
A water heater is a fixed device, which must be connected to the water and power supply. These devices have a closed construction. They do not heat water and store it, but heat the water when it is actually needed. A water heater works automatically. After turning on the faucet, warm water is immediately produced. Depending on the controller, the temperature can be controlled via a partial load switch in two or three stages or fully electronically to the exact degree. The set temperature is always achieved by mixing cold and hot water. A temperature fuse prevents you from scalding while showering. Due to the high connection value, a water heater must always be connected by a certified electrician. Sometimes even the consent of the energy supplier is necessary.
Before we clarify this question, let us explain the differences between the three different types of electric instantaneous water heaters and introduce the gas water heater.
Hydraulically controlled instantaneous water heaters are very cheap in the purchase price. They regulate the heat output via the quantity or the pressure of the flowing water. Before the required pressure is applied, first some tap water must flow through the instantaneous water heater. The power is controlled by the flow rate during operation. hydraulic Heater are not very comfortable, as it can lead to significant fluctuations in operation. It does not produce stable warm water. If the pressure suddenly drops, for example if another outlet is opened, it can even switch off completely. Even water-saving shower heads can lead to shutdown.
Favorable purchase price
only two temperature levels adjustable
Small flow heater up to 3,5 kW with socket connection
Depending on the water pressure
Unwanted temperature fluctuations
unintentional switching off
high water consumption
Approx. 20% higher operating costs than electronic instantaneous water heaters
Small flow heaters for hand basins with hydraulic control, on the other hand, are very much in demand and have their right to exist.
At a electronic instantaneous water heater the temperature is already measured in the inlet and the amount of water passing through. The Electronics then regulates the heating output via fixed or programmed values according to the set setpoint. The principle is to increase a corresponding flow rate of water by a certain number of degrees. However, the initial temperature is not measured.
Lower water and energy consumption compared to hydraulically controlled instantaneous water heaters
regardless of water pressure
exact setting of the water temperature
Performance adapts to the required amount of water
Higher purchase price
It is also called a fully electronic instantaneous water heater. Here not only the temperature in the inlet but also in the outlet is determined. It is produced a degree of accurate output temperature, which is subject to any fluctuations, even if a further tapping point is used simultaneously. These devices have a very special comfort, are often controlled by a remote control. This is especially useful when the spa is located in a central location in the house.
20 - 30% less energy costs
constant heat
regardless of water pressure
Precise temperature setting
suitable for central hot water in the house
solar compatible
Remote Control
High acquisition costs
The gas water heater is constantly burning a so-called control flame or it is burned by a piezo ignition. If warm water is to be generated, the control flame ignites a gas burner inside the appliance. The right temperature can only be maintained by adding cold water. The gas flow heater is also dependent on the gas and water pressure.
The gas kilowatt hour is cheaper than for electricity
High purchase price
control flame
Cleaning at intervals required
no temperature control possible
In principle, there are three performance groups, the instantaneous water heater for the hand basin, the sink and the shower.
Small flow heaters are ideal for a single tap, for example, in the guest WC. The smallest specimens have only a connected load of 3,5 kW and can thus be connected to a special socket circuit by means of a plug. Special circuit means that no other consumer may be connected to this circuit. Small flow heaters are available up to 7 kW, which, however, then already need a permanent connection. Small instantaneous water heaters can be installed in an over-table or under-counter assembly and over a Low pressure valve be connected. For a hand basin is one Flow heater low, but not much use for a sink. Because of its thin water jet so a small water heater is also called "hamster shower". Small water heaters work on the hydraulic principle.
Instantaneous water heaters with a connected load from 8 to 18 kW are most suitable for use in the kitchen. In addition, a faucet can also be connected via a hand basin. You can use any of the three controls of the Water heater offer use. The two preset temperatures of the hydraulic and electronic instantaneous water heater make the most sense. An electronically controlled is here actually thrown out money. The required water temperature can be mixed to the emergency itself.
To operate a shower, your water heater should have at least a connected load of 21 kW. Some of the instantaneous water heaters are switchable from 21 / 24 / 27 kW. Only they generate the necessary amount of water for showering. Hydraulically controlled instantaneous water heaters should only be used in exceptional cases. Temperature changes are the order of the day here. The best water heater for the shower are electronically controlled instantaneous water heaters. They can be adjusted to the degree and promise a clear shower experience under your rain shower.
The Offer water heater is big and confusing. Therefore, before you buy a water heater or order a water heater online, you should think hard about your decision. Not always are the Heater the best ones for you, who were chosen as comparison winners instantaneous water heater. The following questions should be asked before buying:
2. If you only need a single tap, then an output from 3,5 to 5 kW is sufficient. This is ideal for a hand basin or for the guest toilet.
1. How much water do you need in a reasonable time with what water temperature?
3. If a tapping point for a sink in the guest bathroom and / or a sink is needed, a power level from 8 to 13 kW is the right choice.
4. If kitchen, bath and shower are to be operated at the same time and thus a higher volume is required, at least 18 kW must be planned. The Water heater experience has shown that a switchable model 18 / 21 / 24 kW is the best recommendation.
5. Should you Flow heater low If so, then you should opt for a hydraulically controlled device. However, you should note that it depends on how much water flows through and what water temperature is to be heated. Inquire in advance with your energy provider. Not every state approves hydraulic devices.
6. A pair of electronic instantaneous water heaterEspecially when it is electronically controlled, it offers the highest level of comfort. Here either pre-set temperatures are kept constant or they are even adjustable to the degree. The latter becomes even more comfortable with a remote control if you want a rising or falling temperature in the shower without having to choose a different setting on the model. This is especially rewarding Instantaneous water heater price comparisonbecause these models are quite expensive.
A mini instantaneous water heater you get already for under 100 Euro to buy, for one electronic instantaneous water heater you have to calculate at least twice as much. High-priced models naturally have the advantage that they are very comfortable and also save water and energy compared to inexpensive instantaneous water heater models. Since this is a long-term purchase, you should consider whether the best instantaneous water heater, calculated in terms of usage time, is the better purchase. A water heater price comparison is best done on the Internet. Here, too, there are some bargains, a water heater discount or even one reduces water heater Model, if you look closely.
Among the best-known producers of instantaneous water heaters are:
In its issue 01 / 2014 has the Stiftung Warentest instantaneous water heater scrutinized. Eight electronic instantaneous water heaters, two fully electronic and one hydraulic instantaneous water heaters each with 21 kW were tested. So much of anticipation, none of the models tested performed better than satisfactory on average, but this was almost entirely due to environmental impact. The comfort properties were rated as follows:
2,7 satisfying
Ø 4,4 sufficient
Ø 1,5 - 2,4 good
Ø 3,8 sufficient
Ø 1,4 - 1,8 good to very good
Ø 3,8 sufficient
Yes, some instantaneous water heaters have a memory button. The button can be easily and individually assigned to the desired temperature.
It depends on which instantaneous water heater you choose. Some instantaneous water heaters are electronically controlled while others are hydraulically controlled.
No, a water heater needs no storage volume. As soon as the device is stopped, the water is available in no time.
No, a water heater does not need a chimney connection. It does not produce any exhaust gases, so no connection is necessary. Simply plug the plug into the socket and the device is already in operation.
Many models are equipped with a child safety device. This prevents children from playing around and adjusting the temperature.
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Warm water from the tap increases living comfort in every household. But not everyone can benefit from a central hot water supply. Instantaneous water heaters generate warm water where it is needed, next to the sink, wash basin or shower. Many instantaneous water heaters also offer the option of several tapping points. Comfort, acquisition costs as well as electricity and water consumption depend on the control chosen.
Jonas
Author test-vergleiche.com
Updated January 13, 2024
Discover in our Instantaneous water heater test and comparison guidehow to choose the perfect product for your needs.
Greetings from the world of nature! My name is Jonas, an enthusiastic hobby mountaineer, cyclist and angler. Mine leisure I often spend time in the most beautiful camping areas in the world. In addition to my passion for outdoor activities, I am also interested in sporting events and, thanks to my professional work in the automotive industry, in cars and motorcycles.
As an experienced author at Beste-Testsieger.de, where I go for the main categories DIY & Tools, leisure, Drug Store, Budget, Electronics, Home & Living, Fashion and Cars & Motorcycles My greatest concern is to share my passions with you. I hope you find exciting suggestions and inspiration in my instantaneous water heater comparison.
My carefully compiled table offers you an overview of the top 5 instantaneous water heater bestsellers. The basis of my selection is sales figures, survey results, instantaneous water heater test reports and customer reviews.
I also keep an eye out for tests from Stiftung Warentest and share the results in my guide. My goal is to make the cost-benefit factor of the products clear to you to make your decision easier.
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