DEFRO Eko Duo Uni 25KW - The furnace base slides out for optimal settings

I have two problems with the DEFRO Eko Duo Uni 25KW boiler. I would add ,. that the boiler is new, installed by a specialized company in September 2015.
First of all, in the photo below I marked it with a yellow arrow, it is such a thick iron base of the hearth, after it the burnt ash moves into the drawer. From time to time she moves left and falls down. Does it have any blockage so that it doesn't move? Do you have to put out the firebox, choose ash to mount it correctly?
The second problem is the optimal settings for this furnace. I have the impression that the stove burns a lot of fuel for heating a 7-year-old well-insulated house with new windows. Around 35-40 kg of eco-pea coal is burned daily, with relatively light winter, which gives at least 6-7 tons for the heating season. In the previous furnace, Ogniwo 28KW for the season had 4 tons of fleet and 2-3 meters of wood for kindling. Maybe some of you have experience and by trial and error came to more economical settings of this furnace. I currently have factory settings, I haven't changed anything since the day the furnace was installed.

I have terribly unburned coal in the ashtray, no one has this furnace to enter your settings?

buddy, reduce the feeding time or increase the feeding pause by 100% on a good morning

I have such a question, in this boiler with Defro feeder can you smoke in parallel on the second grate with wood? The point is that the boiler normally works automatically on eco-pea coal and during this time I give a few blocks of dry beech to the upper grate to reach the temperature faster and burn less coal.
Today, when I gave a few blocks of wood, after a few minutes I opened the upper door and instead of fire there were large clouds of thick smoke, and the chimney was very dusty.
I will only add that I did not light this wood separately, counting that it will light from the pea coal that burns below this grate and this wood smokes more when it burns.

Bałdyzer wrote:

I will only add that I did not light this wood separately, counting that it will light from the pea coal that burns below this grate, and this wood smokes more when it burns

You need to have knowledge to experiment. How can you burn wood additionally, if you do not burn coal? You just don't have enough air in the hearth. Increase the air supply by the fan, and you may need to clean the air supply ducts in or under the retort. This is the first thing you should do. If you get the complete burning of peas, and you have too much heat at home, then you will have to reduce the feeding times and intervals and reduce the amount of air fed accordingly. The amount of air is regulated by the fan speed and the size of the gap in the fan. Pictures suggest that you also give too much fuel. If you can, try giving smaller portions and more often.

As for burning wood on a water grate, you will never get clean burning, it is used for emergency heating as there is no electricity, and not to reduce heating costs. You burn wood with the fan off and coal feeding, with the ash pan door open properly.

Sstalone wrote:

Bałdyzer wrote:

I will only add that I did not light this wood separately, counting that it will light from the pea coal that burns below this grate, and this wood smokes more when it burns

As for burning wood on a water grate, you will never get clean burning, it is used for emergency heating as there is no electricity, and not to reduce heating costs. You burn wood with the fan off and coal feeding, with the ash pan door open properly.

I understand that this wood cannot be burned cleanly with eco-pea coal, but it is white smoke from very dry (seasoned from 10 years) beech wood so it is not so harmful. After all, somehow this wood burns slowly and raises the temperature, which makes the feeder less eco-pea coal. I still have about 10 meters of wood left so on cold days when I give 3-4 blocks on the upper grate, I think nothing will happen. The neighbors in the countryside have old cinderella, smoke grandpa and poison the area 10 times more than I do.

I hope you have a house with 300m2 because I have a 100 summer house with an area of 120m2, medium insulated (the walls of the ground floor are not insulated because they are stone) and a 12 kW stove.
A lot of smoke in the hearth means that your furnace works as a wood gas generator. All you need now is oxygen and temperature. You will provide everything by minimizing the carbon feed and increasing the fan settings as much as possible. You can also try to reduce the hearth by placing chamotte bricks on the grate.

Waski85 wrote:

I hope you have a house with 300m2 because I have a 100 summer house with an area of 120m2, medium insulated (the walls of the ground floor are not insulated because they are stone) and a 12 kW stove.
A lot of smoke in the hearth means that your furnace works as a wood gas generator. All you need now is oxygen and temperature. You will provide everything by minimizing the carbon feed and increasing the fan settings as much as possible. You can also try to reduce the hearth by placing chamotte bricks on the grate.

I have a house about 200 meters but it is a relatively young 12 year old house, well insulated, wooden windows in good condition. I will try to increase the blow force and reduce the carbon dose, with the current January warming the furnace should be able to do it.
And what do you think about this idea. How about a little spruce wood in the middle of an emergency grate, and 3-4 thick hard wood blocks next to it? Small wood should be easily ignited and thick wood blocks will ignite.

@ Bałdyzer and the exchanger clean? I need at 18 degrees outside 18 kg of coal per 200 m2 at 21 degrees indoors, 10 cm thick EPS boards on the walls.

What temperature do you keep indoors?

You probably have too big a stove, not too small. The chamber in which you want to burn wood may be too large and the gases formed from gasification of wood, they cool down too much and cannot ignite.
Wood burns best in a layer of about 20 cm and of course small brushes will burn better than large pieces. On trial, fill the chamber tightly, wall-to-wall with small brushes.
Check your house's needs on the website www.lowłow flatwie.pl and enter the result.
If you can, put a photo of the flame in the burner during normal operation. I'm sorry they are here.

Sstalone wrote:

@ Bałdyzer and the exchanger clean? I need at 18 degrees outside 18 kg of coal per 200 m2 at 21 degrees indoors, 10 cm thick EPS boards on the walls.

What temperature do you keep indoors?

I keep around 21-22 degrees indoors. Daily combustion with such a light winter as today is on average about 20kg / day with hot water for 4 people. I live in the mountains so here in winter it is usually around 4-5 degrees less than in Żywiec and further north.