KFW40 house with 10 kW wood stove: too large or ok?

  • Erstellt am 2024-12-22 13:38:37

Neuer von Da

2024-12-24 01:19:41
  • #1
[ATTACH alt="kfw40-haus-mit-10-kw-kaminofen-zu-gross-oder-ok-678352-1.jpg"]89460[/ATTACH]

So this stove is enough to heat our house almost completely.

130m2 living area with a total area of 165m2
At KFW 55 standard (23kwh)
The stove runs for 2-3 hours and consumes about 10-15kg of wood

At temperatures around 0-5 degrees.

You will definitely overheat your room.
If you are not careful once, boom, it’s almost 30 degrees in the room.

We have storage stones.
But when they are fully charged, the temperature in the room rises rapidly.
 

PMW1993

2024-12-24 06:59:38
  • #2
Then I have to talk to the stove builder again, thanks for the comments
 

nordanney

2024-12-24 09:39:20
  • #3

I don't understand how you can overheat your houses with that. We didn't manage it with a similarly sized stove. More than 25 degrees were not possible in the evening in a 75 sqm area. No, windows and doors were not left open for draft...

In autumn, I will install an 8kW stove. I have zero concerns about that.
 

Neuer von Da

2024-12-24 10:55:05
  • #4


We have the Schwörerhaus exterior wall 31 cm.
And the stupid air-to-air heat pump.

It runs about 8-10 hours a day and sucks out the humidity...
Or is supposed to be able to heat with 2 kWh.... Feels like it cools the house down because of that.
Maybe slower

The ceiling fan pushes the heat down from the ceiling (winter operation) and apparently sucks in all the colder air from the ground floor.
The staircase (with risers) is next to the living room and chimney effect, or slightly the air-to-air heat pump ensure that temperatures rise on the upper floor.
It’s around 20 degrees in the bedrooms,
The bathroom on the upper floor is heated separately a bit to have about 21-22 degrees.
At strong below-zero temperatures I switch on infrared heating at 130 watts/ per 15 sqm which is enough to keep the rooms around 20 degrees even at minus 10 degrees.

Costs:

Some wood
Chimney sweep costs per year
Electricity for the air-to-air heat pump.
About 1500 kWh with domestic hot water heat pump / year

Some household electricity for bathroom and infrared heating
But household electricity is also low for us 1300 kWh/year
(little cooking, TV and since October a balcony power plant is running)

That was the cheapest solution I found without using the additional heating of the air-to-air ("fan heater") (would also be household electricity.)
And that easily consumes 40 kWh per day (in cold) just for heating plus the electricity for the heat pump.

In other words, I almost only use the stove.
And have to heat the house once or twice at strong below-zero temperatures.

At almost 400 m above sea level
 

elminster

2024-12-24 11:06:59
  • #5
From my point of view, besides the room volume and the insulation, it also depends more on whether the floor plan is open and what kind of stove you have. We have a Swedish stove with soapstone in the living room and there is an open staircase there. It never gets too warm, even when we fire up the 9kW stove fully. Furthermore, it is very crucial whether you have a Grundofen with 10 kW or a stove that releases the heat directly.
 

Arauki11

2024-12-24 11:18:09
  • #6

I would be interested in your experiences with this, also the model, function, mounting location, etc.
Physics naturally brings the warm air (also mostly stove-heated) initially upwards into the rather large gallery, where it becomes warm first. Meanwhile, we use these fans directly on the stove pipe, which I was initially rather skeptical about. Nevertheless, it is now such that it is less warm upstairs, meaning more heat stays downstairs, so it works well in that regard.
Our IR heater sometimes switches on as well, but we have it set more or less just as a basic safety measure.
We only rarely use the "air heat" from the air conditioning, for example, when I sit upstairs and want it warm quickly; then 15 minutes of power mode and it’s good; otherwise, it is used as air conditioning in summer.
We have Kfw40 or even better, and in my opinion we really need little heating costs; however, I believe that this only works with such individual user behavior, also with a stove, otherwise the temperature can quickly go wrong.
In the previous apartment, we had planned underfloor heating and a stove; we then rejected the stove because it was often too warm when the sun suddenly shone outside.

Same here, I think we have a similar model, also with a domestic hot water heat pump, and find it overall very economical.

Exactly. The individual situation on site is of greatest importance (insulation, windows, solar gain, etc.) and therefore it is not so simple to compare. Added to that is always the individual user behavior and perception. For example, I prefer it cooler rather than too warm.
 

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