See here the list of Top 10 best hot water heaters. Read the buying guide and other important factors before making a selection for you or any of your dear ones.

Welcome to our large hot water tank Test 2019. Here we present you all of us more closely tested hot water tank. We have put together detailed background information and also added a summary of the customer reviews in the network. With this, we want to make the purchase decision easier for you and help you to find the best hot water tank for you.

The essentials in brief

A hot water tank is a permanently installed device that allows you to generate and store warm and hot water.
There are two main groups of boilers: the closed, pressure-resistant and the open, pressureless. Both types are available in different sizes and mounting variants. Most hot water tanks are powered by conventional electricity. More and more models are coupled with a solar operation, so as to protect the environment and the wallet.

1. Pressureless Huz 5

The pressureless Huz 5 base boiler from AEG offers hot water at a low price and effort. Its good insulation and easy handling appeal not only to the clientele but also their purses. In addition, thanks to its simple design and small size, it is possible to easily find an installation space.

Editorial assessment

Mass / Mounting Type / Capacity / Article Weight

The hot water tank Huz 5 AEG is based on a pressureless hot water tank, which is equipped for an under-table mounting. With its dimensions of 41.5 x 25.2 x 21.5 cm, this fits comfortably under most sink faucets. This boiler holds only 5 litres and is one of the small stores. In addition, it weighs only 3.0 kilograms empty.

What exactly it means, when a hot water tank is depressurized and how such works, you will find in our hot water tank guide explained. This small storage tank from AEG consists of a corrosion-resistant polypropylene inner container, with a recyclable thermal insulation made of rigid polyurethane foam and an outer sheath made of white plastic.

Due to its low capacity and the corresponding size, the Huz 5 base can be easily installed in a cupboard or under a table. Even if it weighs only 3.1 kg unfilled, its weight increases to 8.1 kg as soon as it is full. You should keep this in mind during the installation.

Power / Average power consumption / Maximum temperature / Energy efficiency class

This hot water tank from AEG works with a power of 2 kilowatts. The average power consumption per day, according to the manufacturer, at 2, 267 kilowatt per hour or 489 kWh per year. At a temperature of 85 ° Celsius AEG set the upper limit of the temperature in this model. The Huz 5 base is one of the better models in terms of energy efficiency. With its class A, it belongs to the upper end of the product selection according to this criterion.

The temperature setting of the Huz 5 base is possible from 35 ° to 85 ° Celsius, whereby at 40 ° and 60 ° C an energy-saving position is incorporated and marked with “e” or “E”. Thanks to its good insulation, it keeps the heated water warm for a long time without overheating, which is reflected in the low electricity costs.

2. SNU 5 SL

The innovative technologies of the SNU 5 SL Boiler from STIEBEL ELTRON not only simplify and increase the efficiency of the operation but also reduce energy costs and extend the life of the device.

Editorial assessment

Mass / Mounting Type / Capacity / Article Weight

The non-pressurized SNU 5 SL boiler from STIEBEL ELTRON provides for an under-table mounting. With a height of 42, 1 cm, a width of 26, 3 and a depth of 23 cm, it does not necessarily fit under any sink fitting. The capacity is 5 litres so that the SNU 5 SL belongs to the small storage. The boiler alone, unfilled, weighs 3.2 kilograms. What exactly it means, when a hot water tank is depressurized and how such works, you will find in our hot water tank guide explained.

Except for the user manual, there is no accessories required for the installation. Due to its low weight, this boiler should be easy to install on most walls. The well-conducting heating element inside the boiler is made of copper. The anti-drip system used produces less moisture on the radiator, which leads to less calcium deposits and thus to a longer service life of the hot water tank.

Power / Average power consumption / Maximum temperature / Energy efficiency class

His power is 2 kilowatts. According to STIEBEL ELTRON, the average power consumption at a temperature of 65 ° Celsius is 0.2 kilowatt per hour for one day. It can heat the water up to 85 ° Celsius. In terms of energy efficiency, the SNU 5 SL plays in the upper league with its class A. If one calculates the average power consumption per day to a whole year high, according to the manufacturer, electricity costs of about € 1,450 per year arise.

What type and size of the hot water tank is the most environmentally friendly?

This, in turn, depends strongly on your personal consumption and demand on the hot water tank. Of course, a solar-powered boiler as an optional source is more environmentally friendly than one with pure electricity or gas. A good insulation of the storage tank, as well as the positioning of the boiler significantly increase the energy efficiency.
Regardless of the degree of insulation, DHW cylinders benefit from a warmer environment, for example near a heat source.

How long is the life of a hot water tank?

Due to the calcification and thus increased risk of bacteria formation, it is advisable not to keep a hot water storage in its original condition over its lifetime. This is on average, depending on the model, 15 to 20 years. Also in terms of energy efficiency and environmental friendliness, it is always worth taking a look at the latest models.

What are the advantages of the hot water tank over the water heater?

Hot water storage

– temperature fluctuations, (especially for models without continuous flow control)

– No possibility to reduce electricity costs

What alternatives exist to a hot water tank?

In addition to hot water storage, there is also the possibility to warm up your water with a water heater. In contrast to the boiler, the instantaneous water heater does not have a drinking water storage tank and is, therefore, more compact in size. The instantaneous water heater is also connected to the cold water line as the boiler but works differently insofar as it is connected directly to the valve. Thus, it heats the water as soon as, for example, the faucet is opened and stops the heating when it is closed again.

1. Supplies only one object

This type of boiler holds around 5 to 15 litres and is therefore suitable mainly for the individual supply of objects. In contrast to directly warming hot water storage tanks and the instantaneous water heater, hot water is always available and solar thermal systems usually also use an indirect boiler. Non-pressurized hot water tanks are generally simpler and cheaper than flameproof since they are not exposed to the water pressure of the waterline.

2. Jacketed storage

As a small bonus here is another type or sub-category of indirectly heated water storage. Double-walled hot water storage tanks, or in short: double-walled storage tanks, represent a storage-in-storage construction in which the (service) water, which is located in the internal storage, is heated by the heating water in the external storage tank.

3. Mounting

Depending on your taste and your requirements, you can freely choose between different forms or types of installation of hot water tanks. What matters is to make the decision that you want or that you can use at all. In small apartments or confined spaces, the installation of a small memory with a bottom of the top table assembly offers more than that of a stand or

4. Wall storage

If you want to buy a larger hot water tank, you should also consult a specialist. He has the knowledge necessary to recommend the most suitable boiler for your home and your needs, and normally also handles the delivery and installation. Sometimes he can also add a few extra extras, such as a radio or Bluetoothlautsprecher, depending on the installation site results.

5. Dimensions

With the measurements, you should make sure that you know where you want to install your hot water tank or will and how much space is available to you there. In terms of energy efficiency, hot water cylinders with a cylindrical shape are recommended because they heat the water evenly and keep it warm. In square forms, however, heat is lost in the respective corners, which has an effect on the temperature of the entire load and their re-heating.

6. Heating capacity

On average, the capacities of smaller hot water storage tanks are 2 kilowatts and of medium to large boilers 4 to 6 kilowatts. The models presented here are all also included in this framework. The heating power alone, however, gives no indication of the final power consumption when using the hot water tank, because at high power is consumed for a short time much power, at a low but little but over a longer time. In the end, this compensates for this and the same power consumption is created for both.

7. Average power consumption

Some providers even state in their product description the average power consumption of their article per year or per day. These values ​​are calculated for operation in standby mode and are intended to give you a rough idea of ​​what cost you can expect should you use this product. The power consumption is derived from the recorded water volume and the set temperature. Even if no hot water is flowing, the boiler keeps the stored water at a certain temperature and heats up again and again.

How often this happens depends on both the isolation of the hot water tank and the set temperature. A lower temperature means a lower temperature loss and thus a lower power consumption to compensate for this by reheating. In general, smaller devices with up to 5 litres capacity are cheaper to use and older models are more expensive if they are not supplied with discounted electricity (eg nighttime electricity).

8. High temperature

Although the maximum temperature is given, it is unlikely that you will ever use it. The higher the water temperature, the higher the degree of calcification within the storage tank and the pipes. In addition, a high-temperature setting in winter leads to additional electricity costs, since the even colder cold water must be heated.
The temperature can usually be set on the device itself via a manual or digital controller. With an average normal consumption of hot water, a setting of 55 ° C, the weekly one-time heating to over 60 ° C, for bacterial control, should not be forgotten.

9. Capacity

How much hot water you and your family need or consume, only you know. It is assumed, however, that in a household with four people, with normal hot water use, a boiler with 150-litre capacity is sufficient. However, the exact size required depends on both the individuals themselves and their habits, as well as the location to be supplied.

10. Permissible maximum pressure

This point plays a role, especially for closed, pressure-resistant boilers. As there is a constant connection to the water pipe, an internal pressure is created in the closed hot water tank. In order to avoid exceeding the tolerance limit, it is important to know what pressure you have on your water supply when buying such a boiler and what that pressure can be for your new boiler. Nowadays, hot water storage tanks should be able to withstand a maximum pressure of 10 bar.

11. Child lock

If you are looking for a hot water tank for your family and there is a small child or a person with limited cognitive abilities in it, you should also make sure that your hot water tank has a built-in child safety device or a safety valve.
These can not only contribute to a significant reduction in the risk of scalding, but also prevent unnecessary hot water consumption.

Trivia: Facts worth knowing about hot water storage

Since when is there hot water storage?

Already the peoples of antiquity, above all the Romans and Greeks knew the production and storage of warm water. Today only ruins of the colossal spas of the Roman people, spread over the Eurasian continent, bear witness
These found great popularity after the 1st century AD, whereas baths had been known to the Greeks before, but only to a lesser extent. At that time the Roman baths were heated by a canal system filled with hot air, the so-called Hypokaustum, and supplied with hot water.

What is the ideal temperature setting for a hot water tank?

The human skin is already at 55 ° C risk of burning. Depending on your personal taste, temperatures in the 30 to 40 ° C range are perceived as pleasantly lukewarm. Based on these findings, a temperature setting of 60 ° C is recommended for private households. Higher temperatures than these lead to increased calcification and increased energy loss.

What is the average amount of hot water needed per person?

On average, a consumption of 40 litres per day is assumed per person.

How do I ensure good hygiene of my hot water tank?

In order to guarantee the hygienic standard and the quality of the drinking water or hot water, hot water storage tanks are made of enamelled steel or stainless steel. Stainless steel is particularly durable because it is extremely corrosion resistant. Enamelled steel tanks, on the other hand, are more susceptible to corrosion, as the enamel often causes spurious or dead spots. You, therefore, need extra protection, this can be ensured by the use of so-called foreign/protective or sacrificial anodes. External current anodes are very robust, but sacrificial anodes mainly consist of magnesium and therefore have to be checked again and again, depending on the quality of the water, and renewed if necessary.