Hi guys,
I happened to come across this thread because we also planned a heat pump + water-carrying fireplace. So far, we have only tendered earthworks + shell construction, but the building services will follow soon.
The majority here are against this solution and I am also almost convinced to give up the water connection and switch to a normal fireplace. My problem at the moment is that the fireplace (I mean 6kW) was included in the energy balance for KfW55. Do you think it can still be changed? I also don’t feel like having everything reassessed by the energy consultant unless absolutely necessary.