ᐅ New Construction KfW 55/70 Heating System Consultation

Hello dear forum,

I am planning to build a new house around mid-next year. Now I am considering the type of heating system, KfW standards, air-to-water heat pump, mechanical ventilation, etc.

Here are the details for the planned new build:

Single-family house without a basement, 142.86 m² (1,538 sq ft) of usable living space, 1 ½ stories, no gas connection available.

We are thinking about installing an air-to-water heat pump with mechanical ventilation + KfW 55 standard, or KfW 70 without mechanical ventilation.

Is an air-to-air heat pump sufficient, or what are the costs during the winter months? One provider recommended an air-to-air heat pump from Tecalor — what is your opinion on these air-to-air heat pumps? Should we consider a gas tank with a small gas burner as a backup heating system?

What are your thoughts on this, and what would you advise? I appreciate both advice and concrete examples.

If there is no basement and no gas connection, I would currently always lean towards an air-to-water heat pump.
Whether a ventilation system is "mandatory" probably also depends on the desired KfW standard; however, it is certainly comfortable.

Florian_1990 schrieb:
What are your opinions on this aspect, and what would you advise me to do?

I would recommend installing a mechanical ventilation system with heat recovery for comfort reasons, regardless of the KfW standard and the heating system.

I would avoid mixing systems (heat pump with gas backup heating). Choose either gas or a heat pump. If you opt for a heat pump, consider either an air-to-water heat pump or a ground-source heat pump (depending on your budget and ground conditions).