A compendium of knowledge about HITZE fireplaces – Find answers to all your questions about our products.


As is well known, the power of a fireplace depends primarily on the amount and QUALITIES fuel loaded into it. As a reminder: in a nutshell, from one kilogram of dry wood we can generate about 3 kW of power.

The above recalculation for dry woodThis does not apply to wet wood, i.e. wood with a moisture content of 20%. However, this does not apply to wet wood, i.e. wood with a moisture content of 60-70%. This is the moisture content of freshly felled wood. What about in this case?

Freshly felled wood with moisture content approximately 60%, loses more than half of its calorific value relative to dry wood. This means that, even assuming that the fireplace will achieve an efficiency of 80% in both cases (dry/wet wood combustion), when recalculating the results based on the subject standard, it turns out that, when burning wet wood, the appliance generates three times less power.

This begs the question: whether burning wet wood is profitable? Definitely not, because apart from the loss of power it involves additional problems.

Nominal power in the HITZE-1 fireplace
Nominal power in the HITZE-1 fireplace


When smoking in fireplace wet wood its efficiency flies down which further reduces the heat output of the appliance. The effect is that by burning wet you lose about 70% of energy.

Does it pay off? Medium. Even taking into account that you "get" wet wood free of charge, a subsequent visit from the chimney sweep will take its toll on your wallet.

During burning wet woodthe firebox of the fireplace is underheated and combustion does not proceed properly. Even lighting with wet wood is quite troublesome, as the wood does not want to ignite.

If the fireplace is burning wet wood, it will not be able to reach the right temperature and will not be able to burn the oxides and particles effectively, thus increasing average emissions. When burning wet wood in the fireplace, the fireplace emits various harmful substances and pollutants which can affect health and the environment.

When burning wet wood and with a limited air supply, creosote will be emitted. This is a tarry substance that settles on the chimney walls. If you burn wet wood for a long time, the chimney can become clogged. And here the jokes end because this is a dangerous phenomenon which endangers health and life. In addition, creosote is a flammable substance and if a so-called soot fire occurs in the chimney, it is rarely reusable.


Burning wet wood is energy inefficient, as a significant amount of energy is lost to evaporation of the water contained in this fuel. In addition, it makes the chimney more dirty and increases the risk of a soot fire in the chimney.

For health and the environment, it is better to use dry, seasoned wood with low moisture content, especially as the process of seasoning wood is not the most difficult. All you need is a little patience, as wet wood will already have reached its optimum calorific value after 1.5 to 2 years. All you need to do is chop it into suitable pieces and then place it under a canopy in such a way that it has adequate ventilation.


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