KFW40EE house - fireplace fire but it should not get too hot

Hello everyone,

since my question fits quite well here, I didn’t want to open a new topic.
So far, the topic has always been about the KfW 40 standard.
If you build solidly with a wall thickness of about 36.5 cm according to the KfW 70 or Energy Saving Ordinance 2016 standard (in my understanding the same?), can you then plan a fireplace (5 kW?) without fear that the room will overheat? A air-to-water heat pump is used for heating (underfloor heating).
The open space (living room, dining room, kitchen) where the fireplace is located is about 60 m² in size.

Best regards

If you get a concrete ceiling, then definitely yes.
60 m2 reinforced concrete - 20 cm thickness equals 30 tons.
Can therefore absorb almost 50 kWh of heat at a delta of 6 degrees.

We have a fireplace in the kfw55 house. We have arranged it so that the heating only keeps the entire house at 20 to 21 degrees (except in the bathroom). In the evening, we then light the fireplace, and we get a pleasant 25 to 26 degrees in the open living area. A gas fireplace or YT is absolutely not an alternative, as the radiant heat from the fireplace is missing, which is part of the atmosphere.

25 degrees comfortable? I don’t have that in the house in summer. Much too warm. It’s always crazy how differently comfort temperatures are perceived.

25 degrees pleasant?

If you’re only walking around the house in your underwear, it’s definitely needed. ;) Sometimes we have that in winter too without a wood stove, when the sun shines in for hours. Wonderful :D

Even that is too much for me at 25 degrees

Despite all the romance, I always advise opening the full cost accounting once.

What does the square meter cost in the new building? How many square meters does the stove occupy? In the end, even over several floors? How many square meters around it must be left free, which cannot be furnished? Where is the wood stored? What does the chimney sweep cost? What does the chimney including additional roofer/tinsmith work really cost? Have I planned wooden flooring in the end?

If you add all this up and then three cozy evenings a year are really worth 20,000 euros to you - then you can continue thinking about it.

25 degrees comfortable? I don’t have that in the house in summer. Much too warm. Always crazy how different comfort temperatures are.

We love the warmth. It can be even warmer. We don’t shade the windows in summer either, but open everything. And we're currently on a "winter holiday" in Thailand. It’s about 30 degrees during the day there, which is great.