Eternal log to save firewood for stove heating

Several years ago, I came across a video showing the use of a small metal container with holes filled with water in a wood-burning stove. The author of the video claimed that the burning time of firewood increased by more than a third. This video:

An "eternal log" filled with water is placed under the firewood in the furnace:

The product is a pipe with legs, certified at both ends (so that it does not rotate along the axis). Holes are drilled in the top and a bolt and nut plug is made to fill with water. The water in the container begins to boil, water vapor comes out and cools the firebox, reduces the combustion activity, thereby prolonging the burning time of the wood.

The effect can be compared to burning raw wood, which smolders for a long time, but gives little heat. In the video it sounded that the firewood burns longer: 1 hour 40 minutes. instead of 1 hour 10 minutes without the "eternal log".

Drawing of this product.

Kind of products from those who decided to try, make an experiment. There are also offers on the Internet for the sale of "eternal log". Prices from 1000 to 2500 rubles.

Maybe this "eternal log" will be effective for a coal boiler too?

Some authors on the Internet mislead the reader by reporting that Brown's gas is created in the container (water decomposes into hydrogen, oxygen and mixes with water vapor and air). And then the gas burns up in a flame. The burning temperature of an open fire is not enough to decompose the water. Then what effect can be based on the efficiency of the "log" (increase in the efficiency of the furnace)?

My opinion is. Because water vapor has a heat capacity of 2.14 kJ / kg * K, and air - 1 kJ / kg * K, then this mixture will take more energy, lowering the flame temperature. Less heated air will climb the chimney more slowly and transfer heat more efficiently to the walls of the stove. The efficiency rises. Whereas hotter air flies out faster into the pipe.

I believe that the burning time of firewood increases due to a decrease in the intensity of combustion. It is possible that in such a slow mode less soot is formed, all products burn out. Do you think there is any effectiveness from this product? Maybe someone used this "eternal log"?

I posted an article on this topic: Engines with a Pantone reactor running on a mixture of water and gasoline. Are there any fuel savings?

The reactor is based on approximately the same principle of increasing the efficiency of the engine when producing steam-fuel gas. Comments on the article were both confirming the effect and refuting.

I would like to mention one more option for using the "eternal log", which is more effective. In rural areas, those who independently change the engine oil in a car accumulate a certain amount of "working off". It can be poured into this "eternal log", but with larger holes. Here's an example:

Type of holes and product in the firebox. The oil evaporates and the vapors burn with a weak flame, or the oil burns in the "log" and the tongues come out of the holes. The volume of this "log" is calculated, it is not arbitrary.

Of course, it is possible to make a furnace that works entirely on development. But if the mining is over, then the furnace will be useless.

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Photos are taken from open sources, from Yandex. Pictures

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