Operate heat pump autonomously with photovoltaic system.

We are building 40+ What information do you need? We are paying about €227,000 for 145 sqm on 1.5 floors with a knee wall of 140cm. Materials for interior construction worth €18,000 and the related services worth €24,000 were deselected. We are doing that ourselves or having it done cheaper. Also, the photovoltaic system for €15,000 is not coming from the builder, because it costs €20,000 there and is not the one we want.

Could you please provide the technical details of the devices installed (controlled residential ventilation, photovoltaics, battery, etc.)?

Could you please provide the technical details of the devices installed (controlled residential ventilation, photovoltaic, battery, etc.)?

We chose the photovoltaic system ourselves; we decided on the Tesla Powerwall 6.3 kWh and 5.88 kWp on the roof. The LWWP_S comes from our builder and is from Viessmann with ventilation system. I think it will be this one: Viessmann Split air/water heat pump package Vitocal 200-S AWB-AC. We didn't have much choice except for separate or internal installation. As soon as it is installed and I have more technical details regarding this, I will publish them on our blog. I document every step and progress there very precisely.

The materials for interior construction 18,000 and the services for it 24,000 were voted down. We will do that ourselves or have it done cheaper.

Would you like to say what would be included in the interior construction?

Just: If I had already known back then that KFW70 is a phased-out model and would become the standard in 2016, I would very likely have built KFW55 alone because of the market/resale value.

Hello Thorsten,

I just stumbled upon this post.
Do you really think that anyone will still care in 20-30 years about which energy standard the building was constructed to?
I think this question will (as it is currently) not be asked and will not strongly affect the price achievable for the property.

Let’s take a look at the current situation on the (used) real estate market.
In areas with medium/high demand, offers of well-maintained used properties usually sell without any problems. Anyone who buys such a property knows that they have to plan X amount for renovation/refurbishment (primarily for the heating system, which no longer meets the state of the art). In such conversations, at most the question about the type of heating (oil or gas) comes up.

In my opinion, it will be similar in 20-30 years. Maybe there will be the question of gas or heat pump. But since today’s gas heating/heat pumps will no longer meet the technical standard of the time, a replacement will be planned by the buyer from the outset.
And honestly – if I show the energy certificate in 30 years, the interested buyer probably won’t know how to read it and even less how to assess it. Not to mention that he might also not know which energy saving ordinance was valid in the year of construction and how he would have to extrapolate this to the current standard.

In the end, the question in X years will be: How much do I have to pay monthly for heating energy.

It doesn't matter whether it's 100 euros for electricity or 100 euros for gas, wood, whatever.