Back to the news


Do I need an accumulator system for my boiler?

With the help of accumulator systems, heat can be stored very easily and cost-effectively. This is particularly useful when heating with biomass or when using more complex heating systems that consist of several components, such as: a combination of pellet heating and solar thermal.

What is the difference between a boiler and an accumulator?

An accumulator is capable of storing heating heat that has been overproduced and releasing it back to the heating system when needed (with a time delay). A boiler is a domestic hot water storage tank in which drinking water is heated by the heating system and consumed on demand (in the form of hot water in the household).

The advantages of an accumulator system

Your biomass heating system can operate in the optimal power range, as excess heat is absorbed by the accumulator. Thus, there is no frequent switching on & off of the heating, which improves efficiency and extends the service life. In optimal operation, the heating system also consumes less fuel thanks to the accumulator and boiler.

You can combine your heating system with other heat generators as you wish. For example, with a solar system. In this case, the accumulator stores the excess heat, which is generated during the day when the sun shines, and returns it to the heating circuit towards evening or at night.

Despite good insulation, accumulators lose heat over time. This leads to increased heat loss in an unheated room, but on the other hand can lead to an additional increase in room temperature in an already warm room. This can be conveniently used to dry various things in the house.

TIP: Make sure your accumulator is well insulated, or make sure your accumulator is well insulated by default when you buy it.


Choose the right dimension and type of accumulator

Due to the different requirements of the various types of buildings in which accumulators are installed, we have a wide range of storage tanks and boilers available – starting at 300 liters up to 23,000 liters as a special solution.
As a guideline for the dimensioning of storage systems for pellets or wood chips heating, one can calculate about 30 l / kW.
For wood log heating systems, the German BAFA specifies 55 l / kW to be eligible for subsidies.

Example: Detached or a multi-dwelling unit with a heating capacity of 15 kW:

15 x 30 (for pellets or wood chips) or 15 x 55 liters (for logs) = 450 liters up to 825 liters accumulator storage.

A distinction is made between accumulators, layered accumulators or solar accumulators, aka solar layered accumulators.