Useful information

Burning wood is sometimes considered as a full time hobby, but with a well-functioning system, good equipment to cut and split up the firewood, and a well-handling system to dry wood, are able to minimize the workload and time. The savings in heating costs in this way may cause high prices of their work.  Even if you do not have your own firewood but purchases logs, which you can cut and cleave by yourself, the costs can be lower.
A wood boiler shall always be fired with an accumulator tank together for utilizing the maximum efficiency of boiler and thereby minimizing their own work, wood consumption and protecting the environment. The efficiency of the boiler varies with power output and maximum efficiency is attained by boilers rated power (nominal power). A charge packet and an automatic shunt are required in order to obtain the maximum performance of the whole heating system.

Selection of boiler

In our range we have two types of wood-fired boilers:

The following table shows roughly the boiler should be chosen on the basis of how big the house needs to be heated up. The figures are based on a normally insulated house. If you have any questions concerning your choice of boiler, please do not hesitate to contact us by phone or email.

Use square meters as the unit of heating surface area measurement

< 200 m2  200 – 400 m2 400 – 600 m2
v202 kub 35kw 55kw 70kw

Selection of accumulator tank

For dimensioning of accumulator tank, there are two basic things to keep in mind:
Accumulator tank shall be dimensioned so that it only requires one heating time per day except during the coldest season per year.
This can be achieved by choosing at least 10 to 12 liters of water per heating square meter, 10 liters for a normal insulated house and 12 liters for a poorly insulated house.
In addition, one should never choose less than 1500 liters.

A well-insulated house with 180 m² heating area as described above should have at least 1800 liters accumulator volume.
One should choose the right accumulator volume so that it is possible to receive and help to save the energy from at least one fully firewood burning boiler. This means that boiler always burns optimally and thus produces the lowest emissions into the environment. Thus there is nothing left in firewood burning chamber lying and depositing at the end of combustion cycle, which both gives rise to unnecessary emissions and also creates more work for the cleaning of the boiler. A common rule of thumb is that the accumulator volume should be 14 to 18 times larger than the firewood burning chamber.

Firewood volume  125 L  180 L 230 L

v202 kub

Recommended volume


1750 – 2250


2520 – 3240


3220 – 4140

It is not a disadvantage if you have the space for a larger volume than this calculation example. Laddomat is installed between the accumulator tank and boiler, then various heating lever is formed inside of accumulator tank; when heating generates, the charge will be stopped.

How large accumulator tank do I need?

The size of the accumulator tank is determined by, among other things, house’s heating needs and building’s heating system. Radiators are the most common heat carrier and there are both low- and high- temperature systems. The example presented below is assumed from the previous energy calculation and shows what separates low-and high-temperature’s system from each other.
In order to obtain the same indoor temperature in a house with high temperature radiators, the temperature of accumulator tank requires being above 60 degrees. That is to say, you only have between 90°C and 40°C to take advantage of accumulator tank. If you want to achieve the same comfort which a house with a low-temperature radiators, the accumulator tank must be larger.

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