New construction, wood-burning stove, nominal heat output, how now?

Hello everyone,

we are currently planning a new build and would also like to have a wood stove (i.e., a heating insert built with fireclay) in the open living/dining/kitchen area. The goal is to minimally relieve the air-water heat pump and create coziness.

My heating load calculation based on the U-value shows that we need a maximum heating output of about 2.3 kW for 64 m² (living/dining/kitchen + hallway connected via 2 doors). This includes all exterior walls (approx. U-value 0.19) + floor construction (0.16).

If I now install a stove with a nominal heat output of 9 kW and a heat output range of 3.2 - 10.9 kW, I will overheat the room despite the minimal amount of wood used (for 3.2 kW). According to the stove builder, this is not a problem because the emitted heat can be controlled by the amount of wood.

The above-mentioned 2.3 kW also refer to the "worst case" with outside temperature at -16°C and inside at +23°C and no other type of heat supply. In reality, the required heating output will therefore be much lower than 2.3 kW.

What now? Choose a stove insert with the lowest possible heat output range?

Best regards.

Everything would be too much.
You can't calculate cosiness either. It also doesn't work to heat only half of the interior of the fireplace.
Therefore: either do without it, use an ethanol fireplace, or expect heat when lighting the fireplace and eventually have to throw the windows wide open.

Can only agree with ypg there. We have a Kfw 70 house (2 floors, of which we live on the ground floor). We have an air-to-water heat pump and a fireplace for comfort.

You can forget about relieving the air-to-water heat pump. Our living room including kitchen is 40 sqm. When you light the fireplace, it’s like a sauna. And you don’t turn the air-to-water heat pump down and up. It runs continuously and heats the floor / hot water.

So it’s category "Romantic, I watch the fireplace burn"

We have already discussed this here in various places and some users have confirmed your suspicion: In new buildings, a wood stove makes no sense. If you light it correctly and without soot, you already have to ventilate again.

Finally someone who has understood it!

We were fully aware that the fireplace, unless it is truly integrated into the hot water/heat generation system, does not contribute to cost reduction.

One shouldn't be surprised later if it turns into a sauna ^^ we like it. Sometimes I walk around in my underwear in the evenings ^^