Buffer storage from ratiotherm - Optimised heat generation

Buffer tank for heating water & solar systems

Perfect for intermediate storage of unused thermal energy

Buffer storage tanks from the manufacturer ratiotherm serve as intermediate storage tanks for currently unused energy from various heat sources such as boilers, heat pumps, block-type thermal power stations, photovoltaics, solar thermal energy or other renewable sources.

Today, these hot water tanks are integrated in almost every heating system as standard and increase efficiency even in older systems. By balancing temperature fluctuations between generation and consumption, they ensure that the heating system does not have to start immediately with every heat demand.

The constant, particularly consumption-intensive on and off is avoided; exhaust gas values, efficiency and service life of the heating are significantly improved.

The storage systems are mainly used for the intermediate storage of energy in the areas of solar systems, heating water, shower water and drinking water.

Our modern heat storage tanks for buffering have several connections so that they can be operated in parallel with solid fuel boilers, heat pumps, solar systems or other heat suppliers. When choosing the size of the storage tank, different factors have to be taken into account: the number of residents and their personal needs as well as the overall energy concept of a building.

As a rule, a stratified tank has a capacity of 750 to 1000 litres, depending on the requirements of the heating system. However, it must be taken into account that heating and drinking water must not be mixed. This is why a fresh water station is a must for particularly efficient heat storage systems, and not just for hygienic reasons. This means that there is no danger of bacteria such as legionella developing in the first place, as is the case with a combination storage tank with "tank-in-tank" principle, where the warm drinking water is located and not moved.

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Buffer tank for solar systems

Efficient buffer storage tanks for solar systems with solar collectors are ideal for using the energy generated on sunny days even in the evening and at night or during longer periods of cloudy weather. In addition to the often used combi-storage, there are other common types. The fresh water buffer works similarly to a flow heater. Here the drinking water is piped through the hot heating water and is only heated on demand. In this case, however, it can happen that the storage tank for solar systems is considerably mixed.

The most modern, intelligent and efficient variant is the stratified storage tank, which works according to the natural natural principle of stratification of cold and warm water. Here, too, the drinking water is heated freshly and precisely as required in the flow movement, so that there is no risk of bacterial growth. For a perfect coordination of the individual components, it is recommended to purchase a system with solar and a storage tank, preferably the entire and thus coordinated heating system from a single manufacturer.

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What is a buffer storage?

These storage tanks are used for the intermediate storage of heating water in heating systems. The purpose of these storage tanks is to create a balance between the heat generated and the heat already consumed. They can thus be used in addition to heat sources such as heat pumps to generate greater energy efficiency. Specialist companies manufacture these types of systems for efficient heating systems. The heat buffers are used, for example, in solar thermal systems.

What is the functional principle of a storage tank and why is it so important for the energy efficiency of a heating system?

With the aid of a stratified storage tank, heat that is currently not required from a heat generator such as a central heating system is temporarily stored and, if necessary, returned to the heating system. For this purpose, the water contained in the stratified tank is heated during heating operation and is later available to heat consumers such as radiators or underfloor heating as required.

This makes the heating system much more efficient, as the consumption-intensive "Stop & Go" is no longer necessary. This is also accompanied by lower maintenance costs and an increased service life of the heating system. Buffer storage tanks are therefore often used in solar systems.


What advantages does the stratified storage technology, which ratiotherm offers for example with the OSKAR° stratified storage tank, have over conventional storage tanks?

A stratified storage tank is based on the physical principle that water naturally arranges itself in temperature layers. Since warm water is lighter than cold water, it rises. In conventional storage tanks, however, this temperature stratification is destroyed again as soon as additional water in the tank causes movement.

With the turbulence of the water contained in the buffer, the heating system loses energy efficiency. In the case of the OSKAR° stratified storage tank, there is a special stratified insert which calms the water moved by the pump. In this way it can be stored and removed without mixing. The house is supplied with hot water as required from the various layers of heat that are created.

During the day, the heating system generates heat continuously and efficiently. Energy costs of up to 15% can thus be saved. If additional measures are taken to improve the energy supply, for example in the form of a solar thermal system, savings of up to 40 - 50% are possible. This should always be taken into account when choosing a suitable specialist company.

Buffer storage 500l, 1000l or 2000l - What is the space requirement of a storage tank and how complex is the installation?

In general, a 750 to 1000 litre buffer storage tank is sufficient for an average 140 sqm single family home. The corresponding space requirement, including accessories, is approx. 8 - 10 m2. However, storage tanks with a volume of 500 litres or even 2000 litres are also possible.

Ideally, the storage tank can be transported with a sack truck. The storage tank can be placed directly next to the boiler with little effort. However, both the installation and the initial commissioning must be carried out by a specialist.

For which heating systems is the ratiotherm storage tank particularly suitable?

Storage tanks are often used in central heating systems which are fired with solid fuels such as firewood or pellets. They develop their best efficiency under full load, but can hardly be regulated to a lower heating output without losing efficiency. If the fuel is completely burned, the buffer storage tank supplies the heating system in an energy-saving way.

In terms of output, central heating provides sufficient energy even when there is a high demand for hot water. However, as the demand is usually much lower than the output power, interval operation is required, especially in the autumn and spring months.

In this case, the heat from a heat generator is absorbed by the storage tank and later released again as required. However, the use of a storage tank also makes sense with other systems such as oil, gas or a heat pump, as it definitely contributes to an improved energy efficiency of the respective heating system.