[Solved] Choosing the Right Boiler for Eco-Pea Coal: Power Calculation for 16sqm, 24sqm & 224sqm Areas

I plan to buy a stove for eco-pea coal, I read a bit on forums and according to forum users, for a building like mine, the sufficient power is about 16 sq. M. The project is 24 sq. M. The usable area is 140 m and the total area is 224 m.
According to the boiler power formulas, it is about 224 m that requires approximately 24 kW.
So the power counts for the usable or total area?

I have a 10x11m house, two usable floors plus a heated attic.
Boiler kwp eko 20kw gutter burner.
Considering the usable area, it is 200m plus the attic 100m.
Total height 2.5m times 300m.
Since I have 24 degrees downstairs, 23 degrees on the first floor and in the attic, about 10 degrees at minus 12, the fuel consumption is around 500 kg per month and a large power reserve is probably 70kw according to the calculation for the total area, it would be slightly exaggerated. The boiler also heats the domestic hot water

I have 16 x 7.6 room height 2.70, ground floor and attic.
So 24 kW from the project will be too much power? There are guidelines for gas heating in the project, maybe hence such power?

Here, count approximately:
http://cieplowlasciwie.pl/

if that's not enough for you, you can hire a specialist to do it exactly.

If it is a new house, well insulated, take the heat demand on a level
60-90w / m2 and choose a boiler for this power.
If you have a project, you have calculated building heat losses and this will be your "boiler power"
You have 24 kW in the project because it is probably a combi boiler.

suharow wrote:

So 24 kW from the project will be too much power?

If the house is new and well insulated, it will definitely be too much. Assuming a factor of 75 W / m2, this gives a power of about 16 kW. Remember also that the above-mentioned power is given to the lowest daily average in a given climate zone (about -20 degrees) and such temperatures are very rare in our country - so it is better to have a boiler a bit too small than too big. Because an oversized boiler will cause trouble almost the entire season, and a bit too small for a week a year at most.

suharow wrote:

There are guidelines for gas heating in the project, maybe hence such power?

Certainly - gas boilers are now available in only 2 or 3 power versions (oscillating just around 20 kW) - this is due to their great power modulation capabilities. In the case of a gas boiler, you should focus more on the parameter of minimum power than maximum ...

Added after 1 [minutes]:

Oh, and it is also important whether your boiler will heat DHW ...

The building is new, yet not insulated.
The boiler is also to heat domestic hot water

suharow wrote:

The building is new, yet not insulated.

And when do you plan thermal insulation?

suharow wrote:

The boiler is also to heat domestic hot water

What is your domestic hot water consumption?

Use the website http://cieplowlasciwie.pl as advised by a colleague above. It's a pretty good free OZC calculator.

I counted in this calculator and for the insulated one it came out 10-12 kW and for the under-insulated one 24 kW.
We plan thermal insulation for next year (money, or rather the lack of it).

suharow wrote:

The building is new, yet not insulated.
The boiler is also to heat domestic hot water

I understand that through the hot water heater
so you need to check the coil power in the tray
in addition, the type of the tank (with a coil or double-walled)
The capacity of the cylinder coil should be the same or greater than the boiler capacity.
You select the boiler according to the target heat demand.
You take into account central and hot water
The fact that the building is now not insulated is a transitional period and the power of the boiler
choose a finished house.
In addition, there is also the boiler automatics, because it "governs" the power transferred to the central heating and hot water
I would propose to ask the seller for the selection of devices (you can verify what he chooses)
If you make mistakes when purchasing devices, operation may be far from optimal.
In the sets: heating boiler + DHW tank + control, minor errors are often important in the operation of the set.

suharow wrote:

I counted in this calculator and for the insulated one it came out 10-12 kW and for the under-insulated one 24 kW.
We plan thermal insulation for next year (money, or rather the lack of it).

Some manufacturers of boilers with a feeder can order a smaller boiler with a burner from a larger model. That is, for example, a 17 kW boiler with a burner from the 25 kW version. Something like this would arrange you, after insulation you put on the right burner and it's ok. Unfortunately, it costs a bit and before you warm up you have to accept the boiler with a higher flue gas temperature, i.e. with lower efficiency, when the boiler will operate above the declared power. However, there should not be many such situations.

In that case, I conclude that 24 kW from the project is too much power and look for about 16 max 20 kW

suharow wrote:

In that case, I conclude that 24 kW from the project is too much power and look for about 16

You just need 16 kW. As I wrote, the 24 kW for an uninsulated house is only available for a daily temperature of around -20 degrees. For a crushing part of the heating season, you'll need less than half that power, around 10-12 kW. A 16 kW boiler will still have a reserve for typical frosts, and if the temperature drops to -20 degrees for a few days, you can temporarily heat yourself up with e.g. oil.

New generations of eco-pea coal boilers, and more precisely, multi-fuel boilers with a gutter burner recommended by me, the retort limits the user to one fuel, in the power range of 15kw to 25kw eco-kwp multi have identical burners. The boiler power is regulated by the controller itself and the selected blowing. Drivers e.g. tech-483 with pid. in the service settings tab, it has limited airflow and not only to the given maximum boiler power. Of course, the construction of a boiler, e.g. 15kw, will not allow you to achieve 25kw of heating power by changing the settings alone, and to maintain the 5th class of flue gas emission, too small area of the boiler water jacket. Remember that the boiler should be chosen by an installer experienced with this type of boilers. low boiler power. At the first stage, high boiler inertia, increase in boiler temperature after the above-set one, long downtimes, which are very dangerous with pellet fuels, heat retraction into the container; at the second one, there is no additional heating of the boiler, the effect of condensation on the walls of the boiler, airflow operation in high speed ranges, which causes the blow-out of light fuels.At the end, the boiler installation itself can reduce its efficiency by up to 30 percent. Blacksmiths will not install and set these boilers correctly.

1. The boiler should be selected according to the heat demand after thermal insulation.
2. Do not oversize the power of the feeder boiler, unless it is a pellet boiler with an igniter.
3. For the period of insulation, put a used backfill, unfortunately these are additional costs for installation, it should be considered whether it is not profitable to take a loan for insulation, if there is no own financial resources ...

After consulting with a plumber, I decided to buy a red stove with a capacity of 15 kW.