Choosing a Solid Wood Boiler: Meet Class 5 Emission Requirements, PN-EN 303-5:2012, 17.5kW

Hello everyone and please help me choose a boiler . Pursuant to the regulation, from October 1 this year it will not be possible to produce boilers that do not meet the class 5 emission requirements of PN-EN 303-5: 2012. Stocks can be sold out until July 1, 2018 . After this date, only automatic boilers without an emergency grate and with manual loading are to be sold - all meeting the 5th class emission requirements.
My dear, what boiler should I choose for solid fuel-wood ?? . I have an old 17.5kw type Olsztyn Ski stove with a solid stove from 2002, I am thinking of a change? But for what ?? There are a lot of companies, maybe experts on the subject will say something and help a little bit.

You don't have much choice, only two charging boilers meet class 5.

I mean a purchase before July 1 and a worthy successor to my old man from Olsztyn.

As a wood charging boiler with bottom combustion, I recommend MPM DS:
http://ranking.czysteogrzewanie.pl/kotly-dolnego-spalania/kociol/mpm-ds

And it's best to use a heat buffer for it.

Is only wood burned and do you plan to use coal? If so, it is worth taking an interest in gasification boilers where there is much better control over its combustion. Such a boiler is expensive and often complicated but in a good installation you can get comfort like gas, and high efficiency quickly amortizes the purchase cost. If coal combustion is also involved, then gasification boilers are not suitable and it is worth looking for good DS boilers as linked above.

http://czysteogrzewanie.pl/2013/05/drewniana-pulapka/

Worth reading.

gaz4 wrote:

Such a boiler is expensive and often complicated but in a good installation you can get comfort like gas, and high efficiency quickly amortizes the purchase cost.

Do I know if this depreciation will be so fast? An ordinary DS boiler adapted for wood (e.g. MPM DS mentioned) with a heat buffer will easily achieve an average annual efficiency of 60% at a cost of about 10,000 for the whole. Gasification boiler with a buffer (because, unfortunately, gasification boilers must work with a buffer) will cost up to 2x as much and its average efficiency is 90%, which is only 30 pp more. Burning oak wood in a house that needs 15,000 kWh per year will consume 8.6 cubic meters of wood for the DS boiler and 5.75 cubic meters of wood for the gasification boiler. Therefore, we save about 3 cubes of wood per year. With a cube price of 180 PLN, we get an annual saving of around 540 PLN. It will therefore pay back around a decade. And if the author has a source of cheaper wood, the return can last the same as the life of the boiler.
And it should be remembered that the gasification boiler is demanding when it comes to the quality of burned wood, e.g. wood must be properly seasoned, burning with not completely dried wood can finish such a boiler quite quickly, when a regular backfill can cope with it. It is still interesting how the issue of reliability presents itself, because these boilers are indeed structurally very complicated and a possible defect can be expensive to repair.
Personally, investing in a holzgas boiler seems dubious to me despite the undoubted advantages that this boiler has.

So we have about 10 years for depreciation, less problems with chopping and storage of additional m3 of wood, and greater comfort. As usual, there are also costs or risks associated with operating a complex (and thus inherently sensitive) device. You can always look for compromises, i.e. a gasification boiler, but with a simpler design. I looked at what is on the market and there are very simple boilers like Orlan:

https://kotly.com.pl/kategoria-z-wentylatorem-nadmuchowym-160.html?l=pl

But if I were looking for something personally, I would choose something constructed like this Holz Master:

http://www.hkslazar.pl/produkty,kotly-co-holz-master,52,83.html

I don't see any traps in the diagram, but I'm just a theoretician. It has everything a good gasification boiler should have and seems easy to clean and maintain. This design should handle lightly wet wood perfectly because water vapor will react perfectly with charcoal, and the combustion chamber constructed in this way should perfectly burn tar etc. If problems occur with dark wood, only when working with heavily reduced power. Fewer ash problems could arise in the combustion chamber, which is probably why this patent is for manual cleaning. If comfort is high, then even the risk of "devils sitting in details" (it's worth looking for opinions on what's breaking down) is a boiler of this design in my opinion is a good choice only for wood smokers. Of course, the higher the price, the greater the investment risk, so people who would have to debit heavily on a gasification boiler should buy a regular one - more work with them but a good night's sleep because the installments are not sitting at the back of the head

https://www.youtube.com/watch?v=ZvVVt4JBhVw

Above, a movie showing the operation of a nice Sigma gasification boiler. It turns out that a good boiler can be bought below PLN 10,000:

http://www.tanieogrzewanie.pl/kociol-zgazowujacy-drewno-holzgaz-sigma-20kw

On this page there is also a DS boiler with a large combustion chamber, which will make wood burning easier. I will leave the assessment of whether he is good to Xantix.

http://www.tanieogrzewanie.pl/kociol-dolnego-...wno-z-powiekszona-komora-vespa-standard-12-kw

puchal.bass wrote:

My dear, what boiler to choose for solid fuel-wood ??. I have an old 17.5kw type Olsztyn Ski stove with a solid stove from 2002, I am thinking of a change? But for what?

Give details: what building do you heat, how insulated, is there someone permanently at home or not, where is the boiler room located, what is the price of firewood and at what price? What type of heating: radiators or floor heating?

gaz4 wrote:

On this page there is also a DS boiler with a large combustion chamber, which will make wood burning easier. I will leave the assessment of whether he is good to Xantix.

There are no miracles with it. A boiler built for coal will not fully use the potential of wood. Little ceramic burner, and most importantly - it is a bit "low power" - this is really the upper and lower boiler only the so-called cleanout partition that changes the exhaust gas circulation to lower combustion. But any leakage of this partition will cause combustion problems, greater mounding and tarring in the loading chamber. By the way, practice shows that such converted upper and lower boilers are not good at completely "lower" operation (I do not know what it results from, but users of this type of boilers after modifications confirm this fact). It might not be a bad choice for coal, but it doesn't match wood well.

gaz4 wrote:

even the risk of "devils sitting in details"

And such a devil is the detail in the form of building insulation. If the building has a large surface area or has a very high demand for heat, then the matter with the gasification boiler complicates, because the possible buffer may already have unacceptably large dimensions, which limits the operation possibilities of the gasification boiler. Dolniak with a small buffer will handle it, because you can always suppress its power without the risk of serious damage to the boiler itself. On the other hand, throttling the holzgas boiler can be a very risky move - it's a bit of a risk to risk with such an expensive machine ...

Xantix wrote:

By the way, practice shows that such converted upper and lower boilers are not good at completely "lower" operation (I do not know what it results from, but users of this type of boilers after modifications confirm this fact).

I do not confirm, my upper-bottom boiler converted into a bottom one works like a full-fledged bottom, the key is the proper construction of the boiler, mounted tight upper partition, a good ceramic burner and a solution of the secondary air supply, after these modifications it practically does not differ from MPM DS, except for another burner type.

Xantix wrote:

gaz4 wrote:

even the risk of "devils sitting in details"

And such a devil is the detail in the form of building insulation. If the building has a large surface area or has a very high demand for heat, then the matter with the gasification boiler complicates, because the possible buffer may already have unacceptably large dimensions, which limits the operation possibilities of the gasification boiler. Dolniak with a small buffer will handle it, because you can always suppress its power without the risk of serious damage to the boiler itself. On the other hand, throttling the holzgas boiler can be a very risky move - it's a bit of a risk to risk with such an expensive machine ...

Good point. It doesn't make sense to murder gasification boilers with very low power. The ignition process in such a boiler does not differ from others, so with a sufficiently large buffer, you can smoke every 2-3 days. Or use the G12as tariff, even the high efficiency of such boilers combined with a low fuel price does not prejudge the lack of profitability of this solution. When choosing a gasification boiler whose cost depreciates over a decade, you really choose the comfort of use. And this means that in the transitional periods for convenience you can sacrifice a few pennies - when the house gets warm and the DHW calmly warms up with an electric heater at a cost of about 20 gr / kWh.

Cichewicz 15kw accumulator. Old good construction, modernized to category 5. I have an older model for 9 years and I am very pleased. It has 3 flue gas ducts, 6mm sheet, large top-loading chamber (ideal loading for sawdust or wood chips). Unfortunately, but due to the rather high costs of buying wood, I switched to gas.

http://www.cichewicz.pl/files/productsfiles/id37/Eko_karta_kat.pdf
https://www.artbud.pl/pl/p/Kociol-CO-5-klasa-Kumulator-25-40-kW-na-drewno-kawalkowe-/7433

s-max wrote:

Cichewicz 15kw accumulator. Old good construction, modernized to category 5. I have an older model for 9 years and I am very pleased. It has 3 flue gas ducts, 6mm sheet, large top-loading chamber (ideal loading for sawdust or wood chips). Unfortunately, but due to the rather high costs of buying wood, I switched to gas.

http://www.cichewicz.pl/files/productsfiles/id37/Eko_karta_kat.pdf
https://www.artbud.pl/pl/p/Kociol-CO-5-klasa-Kumulator-25-40-kW-na-drewno-kawalkowe-/7433

It was written that it is 5th grade, and the efficiency given is 83%, which means that the boiler can not be classified into 5th grade ... What is this about?

Sstalone wrote:

What this is about?

Marketing gibberish. In the specification how the bull stands, that the boiler meets the criteria of class 3, and what the manufacturer enters in the advertising folder is his invention ...

or maybe you know something about the EKO-WERY boiler Michał ??

Read here:
http://ranking.czysteogrzewanie.pl/kotly-dolnego-spalania/kociol/eko-wery-michal

5th class CH boiler purchased after July 1, 2018 it can only be connected to an appropriate buffer size, only central heating or other devices can be connected to the buffer tank .