About us


Peter Östberg Pavlova:  My career  in construction business took off in the 80.s I have over 30 years experience in construction and masonry.

My wife, Tetyana  grew up in the Ukraine countryside. The last years before she took off to Sweden she worked as a journalist.
 

The stove fulfilled our expectations directly and we soon realized that this is a unique product in Sweden and for other countries too.  

The Swedish winters are harsh but not even close to the Siberian ones.

If these stoves are sufficient in Siberia and all over Russia, they must be good enough for Sweden.

And so the story of the company Ekonomka began.

We went through a Russian specialist education for stove masoners.

Peter focused on the construction and Tetyana focused on learning the principles of designing a Russian stove in the CAD drawing system.

What does the word Ekonomka mean?

Ekonomka is the name of a russian stove that is famous for its good effectivness and its good qualities.

The word "Ekonomka" means economic.

Construction

 

The stoves are made out of clay bricks, chamotte bricks, clay and sand.
sweeping hatches, fire place doors, bakery oven doors, stove tops and dampers are all made out of high quality cast iron, and in some cases they include windows of high temperature (up to 800 degrees celcius) ceramic glass (customers choice whether to have glass or just plain cast iron).

The fire place is built out of chamotte bricks with a 65 mm (approx 2.5 inches) dimension, surrounded by 120 mm/approx 4.7 inches) clay bricks. Between the inner construction of chamotte bricks and the outer construction of clay bricks an expansion space is left.

Some stove models have a double wall construction. To optimize the combustion, our fire places are provided with both primary and secondary air (blue arrows). Primary air travels from below, upwards through the grate in the hearth. The in-flow is adjusted by openings in the ash door.

Secondary air is provided through an opening on the frontal part of the fire place and under the "katalysator" (it travels through the sides of the fireplace where it is pre-heated and mixed with the smoke gas).

A massive stove requires a strong foundation, durable for high weight long time pressure and a chimney with channels
measuring 140x260 mm (approx 5.5x9.8 inches).
Smaller models are connectable with chimney channels measuring 140x140 mm (approx 5.5x5.5 inches).
Cylindric metal chimneys work as well, as long as the area remains the same.

The two chamber system

We construct mostly stoves consisting of either one or two chambers using "the free gas movement system" (FGM).

They do not consist of channels like classic tile ovens.
In two chamber stoves, the powerful fire place is built out of 65 mm (approx 2.5 inches) chamotte bricks in the first chamber.
Obtaining a proper combustion calls for the three T:s 3T
* Temperature
* Turbulence
* Time

Oxygen react with the combustible gases at the optimized conditions:


* High temperature reaching up to 1000 degrees celcius.

* A turbulent mixture of combustion gases and oxygen.

* A sufficient period of time in the combustion area so that the combustion process can develop completely.

These optimized conditions will cause an almost complete combustion of the wood.
In the chamber system the gases move freely. The warmest gases rise up to the inner roof of the first chamber and the massive starts to absorb the heat.
As the warm gases decrease in temperature they gradually start to sink to the bottom of the chamber to be transported into the next one. The process repeats itself and finally the gases are led out through the chimney.

The principles on which the chamber system is based, cause a more natural and energy saving combustion comparing to systems based on draught.

Thanks to the chamber system, the warmest gases will always maintain at the upper part of the chambers giving heat to the massive. The cooler gases are to be transported out the chimney.

The largest amount of heat produced during the combustion will be kept in the first chamber, usually measuring 1.4 m height.
The temperature of the exiting smoke normally measures about 100-120 degrees celcius.

The classic tile ovens using a "contraflow" system experience heat losses due to the fact that the smoke gases are being
mixed with air all the way from the fire place to the chimney.

the chamber system stoves are very flexible regarding design, size and function.


History of FGM

Igor Kuznetsov, Peter och Tanja

The "free gas movement system" was developed in Russia in the early 20th century. The Professor V.E. Grum Grzhimailo worked out the primary basic theory. His successor, Doctor of technology I.S. Podgorodinov, Proceeded his work. In the mid 1960.s the russian engineer Igor Kuznetsov began to improve the constructi. In particular regarding the basics of the design of the stoves using the "free gas movement system".

Until the present day over 4000 massive stoves have been designed and raised by Igor Kuznetsov and his team of trained masoners. He owns several patents of improvements of the system. Igor's team has gone through a major expansion, now consisting of 40 working masoners making his constructions all over Russia, Ukraine, Canada, U.S.A and Europe. Each year hundreds of stoves are built upon his principles and the demand is steadily increasing.

Our cooperationand education with Igor Kuznetsov as a mentor started in 2004. His technical leadership is a great source of inspiration which is continously encouraging the professional developement of our company, Ekonomka massiva murspisar AB (Ekonomka massive stoves AB). In the summer of 2009 we went visiting Igor Kuznetsov on his residence in the Ural mountains. He provided us with further education in prints of massive stoves and we got an introduction in water heating stoves.

Effekt


The russian massive stoves are designed to be used as heating systems in the harsh siberian climate. A properly made russian stove is able to maintain a constant room temperature (about 20-22 degrees celcius) from only two daily fires with an average outside temperature reaching down to the extreme 20 degrees below zero. The size of the stove shall be adjusted to the heat losses of the house.

The maximum effect of a small massive stove is about 2,5 kw, equivalent to 60 kwh a day (based on about 17 kilograms of birch wood with about 20% humidity a day.

The maximum effect of a large massive stove is about 6 kw, equivalent to 144 kwh a day (based on two fires, each consisting of 20 kg of wood, one in the morning and one in the evening.)

The maximum effect must cover the heat losses of the house during the coldest part of the year.

Usually during the winter, only one fire consisting of about 15 kilograms of wood is necessary. The massive stoves store the produced heat in their massives during a long time. Depending of different parameters such as size, outside temperature, the size of the house and the isolation of the house it is not unusual that the stove stores the heat up to 2-3 days.

The thermal efficiency of a proper russian stove is according
to documentation about 90-95%.

Test

In january 2009 The swedish boiler association (svenska ångpanneföreningen AB) measured the emisson values on a massive stove installed on the island of Gotland. The emission values turned out to be far below the permitted limits and the thermal efficiency was established to be about the impressive 95%. Read test result document here.

Our conclusion of the test results is that there is no fire place comparable to the ones using the "free gas movement system" regarding emission values and thermal efficiency.

Document here...

Models

Massive stoves that are constructed upon the FGM are very flexible regarding size, shape, functionality, capacity and appearence. A massive stove can be installed in the middle of the house with an open space surrounding it or, if desirable, the different walls of the stove can be pointing towards different rooms. In these cases the distribution of the heat works freely without assistance of blowers.
Our company has over 30 years in construction business and can therefore offer you consultation or the actual realization of the rebuilding of your house in connection with the building of a massive stove.

Depending on size, massive stoves can be utilized as primary or secondary heat source. About 90% of the stoves we build are equipped with a stone bakery oven. The price increases slightly but the convenience of having a stone bakery oven ready to be used every day makes it all a well worth investment.
The stone bakery oven offers the opportunity to bake, fry, grill and heat food. A fire in the evening leaves you about 100 degrees celcius in the bakery oven the next morning.

You can combine several different functions into a massive stove. for instance: Cast iron stove tops for cooking, metal frying ovens, comfortable heated seating surfaces, heated beds, niches, shelves and masoned ventilation hats. The variations are many. You can even build two massive stoves standing on each other reaching up to a second floor
of the house. you can also do water heating stoves with auto circulation systems or with a pump.

We also design models suitable for traditional saunas, and outdoor garden complexes with grills and ovens. Planning on starting a café or a pizza place? Ask us and we will either find a traditional print of a bakery oven or we will custom design it to fulfill your visions.

Our ambitions are not only to make the market's leading massive heating stoves. We also share a deep pride and passion for the artistic work of stove masonry. Our massive stoves are each monuments. Whatever is your taste, we most likely have something for you. whether you like straight lines or grand ornaments.

 

Water heating stoves

Water heating stoves "Ekonomka" are often built with double walls. One or two water heaters are placed in the first chamber next to the fire place. The water is heated by the hot smoke gases after the combustion and does not decrease the temperature in the fire place.

Due to the nature of the chamber system (the most temperate smoke gases are found at the upper level of the chamber) it is important that the water travels from downwards to upwards inside the heater. This prevents condensation in the system and enables self circulation, without the use of elecricity.

Water heating stoves can be integrated in different systems with accumulation tanks, underfloor heating, radiators, water for domestic needs and solar panels. The advantage of water heating stoves is that the heat absorbation of the massive serves as an extra accumulator.

Integration of additional fuctions such as bakery ovens and "slow coocking tops" is also possible in water heating stoves.

Small water heating stoves for domestic water needs only are also available. These variations are suitable for summer usage for instance.


Burning

 

Pile the wood in horizontal position about 15 cm from the glass and set it on fire from above using splinters and paper. If the wood is dry enough the fire will spread down the pile quite rapidly the quantity of wood depends on the size of the stove and which model it is. Shut the damper gradually as the fire intensifies. If the fire is set from under the smoke gas will be cooled as it rises through the pile. The temperature will be insufficient and the combustion will not develop fylly during the lighting phase.

The combustion requires much air and therefore, the ash door shall remain open during the lighting and when it turns into a proper fire it can be left ajar.
The fire shall be vivid but not to intense. The flames shall be light yellow but not dazzling white. If the flames appear in a deep yellow hue, the air supply is to little. Open the ash door a little to provide more air.

If the fire gets to intense you can restrain it by adjusting the main damper (the upper one), not by adjusting the ash door. Try to avoid opening the fire place door when not necessary. The temperature decreases rapidly and this impairs the combustion.

Close the main damper when there is no more glow. The damper will keep the warm air inside the chambers to transfer the heat into the brick walls. The bricks will release a comfortable warmth during a long period of time.
The optimized heating effect is obtained from 2 fires a day (morning/evening) when the outside weather conditions are harsh. During normal conditions 1-1,5 fire a day is sufficient.

wood

The fuel shall consist of wood with a maximum humidity of 20%. To achieve an optimized combustion the wood shall preferably be stored under roof for at least a year before usage. A few days before the planned usage of the wood it shall be brought inside.
Do not store the wood under a tarpaulin. A high moisture level in the wood will ”steal” energy out of the combustion and the temperature inside the fire place will not reach the desired level. This will increase both the quantity of wood needed to reach the optimized temperature as well as the the emmission values.

Preferable log dimension is about 5-10 cm in diameter. Oversized logs require to much time to burn out and the dampers can not be closed until the fire has finished completely. In optimized conditions the fuel consists of logs of about the same dimensions.

Different kinds of wood can serve as fuel but our experience is that logs of pine generate more heat than logs of birch although birch is being more frequently used in traditional fire places. Oak and other hard trees should not be used, the stove could be overfired.

Our hypothesis is that this is due to the fact that the combustion in stoves using the free gas movement system is more efficient and complete in comparison to the combustion taking place in other fireplaces.