Planning of heating and ventilation technology for KfW 40-Plus single-family house

Then it fits quite well!

Top. Looking forward to it

The heating engineer said during the phone call something about currently installing heat pumps that only require a flow temperature of 28 degrees to adequately heat the room. Could that be true? I had once read something about a minimum of 30 degrees.

that he is currently installing heat pumps that only require a flow temperature of 28 degrees to adequately heat the room. Could that be?

Yes, if the entire system is properly designed (design of heating circuits, spacing of pipes, and hydraulic balancing).

Top. Looking forward

The heating engineer said during the phone call something about currently installing heat pumps that only require a flow temperature of 28 degrees to adequately heat the room. Could that be? I once read something about at least 30 degrees.

This is not a matter of the heat pump, but depends on the design of the underfloor heating. However, it already makes a good impression. I would not expect a guesswork "we’ve always done it this way" design now.

Hi,
here is a reference value for our heat pump + controlled residential ventilation: Alpha Innotec 6KW brine-water heat pump + Maico controlled residential ventilation costs approx. €20,000 net including installation. However, from the air distributors onward, we install the controlled residential ventilation pipes ourselves, saving a bit; we do this not only for the money.

Both semi-detached houses are each slightly smaller than your house but consist of 2 living units each. I think you will therefore be somewhat higher. The drilling (2x 110m for the entire house with approx. 300m²) costs each party €5K net so far without renegotiation. The house is also KfW40+ (even passive house).

The underfloor heating for my 128m² I believe costs around €10K net, but that already includes the entire floor insulation, partly with expensive WLG 023 ;-(

But I might be mistaken about the underfloor heating, it seems a bit high to me just now...

According to calculations, as far as I remember correctly, a heat pump with 6KW would have been sufficient for the entire house since the demand was at 5.3. However, this did not work because of the real division.

If I haven't miscalculated, you come to a total of approx. 42 TEUR with EL including drilling. I think my 40' plus drilling is quite realistic.

The drilling (2x 110m for the whole house with approx. 300m²) costs each party 5K net so far without renegotiation.

Can you already get a fixed price for the drilling with the help of the soil report, or is it always just an offer and possible additional costs come on top?