Fireplace and underfloor heating

Hello everyone in the forum!

I have a general question about the topic fireplace.

We are planning the construction of a single-family house including geothermal energy, centralized controlled residential ventilation, and underfloor heating.

With the planned insulation, it could possibly become a KfW-55 house.

In addition, we want to have a single-flue chimney with air supply installed.

Now I have been thinking about the later use of a fireplace:

Currently, in our apartment living room, we have a room temperature of 22 degrees.

If we later do the same in the house and do not open the windows for ventilation because of the controlled residential ventilation, then the living room probably won’t cool down so quickly when the heating is turned down.
The underfloor heating actually takes several hours to heat up and cool down, right?

If we now turn on the fireplace at 22 degrees room temperature, it should become unbearably warm in the living room. Or am I seeing this wrongly?

That you can control the underfloor heating separately, I know. But that you then have to turn it down beforehand if you want to light the fireplace in the evening is exactly the point. If it is already constantly warm enough, then I don't need a fireplace. We want it less for saving heating costs and much more for the sake of coziness.

Hello karliseppel,

thank you very much for your detailed post.

I am a complete layman and therefore very grateful for your information.

I only have the concern of spending a lot of money on the chimney and fireplace, only to find out that the operation does not meet expectations.

.....I only fear spending a lot of money on the chimney and flue, only to find out that the operation does not meet expectations.

The concerns are quite justified!
Take a look at your heat load calculation, the room heating load of the installation room, and compare it with the minimum heat load of a wood stove!
By the way: separate air supply is always more efficient than the combination!

Best regards

By the way: separate air supply is always more efficient than the combo!

Hello €uro, can you explain that to me in more detail?

Hello,

Hello €uro can you explain that to me in more detail?

In my opinion, the annular gap is often too small; unlike the LAS of a gas condensing boiler, there is no fan here to help overcome the pressure losses. I faced the same question with my tiled stove at the time, calculated everything, and then decided on a separate combustion air supply from below.

Excessive draft can possibly be throttled, too little draft cannot be changed afterward! The amount of air depends on the output of the stove. Accordingly, both the air supply and the chimney must be dimensioned.

Best regards