New heating system with hot water preparation?!

For example. And that the electricity costs will increase. Or am I mistaken?!?

High is relative. If the instantaneous water heater (24 kW is okay) is close to the consumer and the heating system is not touched anyway, I would not change anything. It also depends on the number of users and usage behavior. 5 people 3 times a week in the bathtub is "expensive"

But you also have to pay for the effort if you replace the instantaneous water heater with another water heater ==> see note #12

The probably most affordable option would be to give the heating a storage tank. This usually works quite well and cheaply. But if there are only 1-2 people at most, I would simply keep the instantaneous water heater. Then at least you always have hygienic, impeccable hot water.

We are a family of four, 2 adults and 2 small children. I will write the rest tomorrow morning.

Where can I find such a professional who calculates that?!

No professional, but free of charge: Instant water heater: 600kWh/year * €0.28/kWh = €168/year per person Gas: 600kWh * €0.06/kWh / 50% efficiency = €72 BWWP: 600kWh/COP3 including losses * €0.28/kWh = €56 With photovoltaics: 200kWh * 25% * €0.28/kWh + 75% * €0.1/kWh lost feed-in = €29 With 4 people, you save a maximum of €550 per year. Of course, consumption-dependent and without claim to accuracy, but a rough indication. Various factors play a role in efficiency and the annual performance factor, e.g. storage losses.

No professional, but free of charge:
....

Good morning,

with the calculations I somehow had something else in mind (what is worthwhile etc) ops: I probably misunderstood.

Ok, that would be the current status. But what if electricity prices rise?
E.g. the Buderus domestic hot water heat pump Logatherm WPT 250 I costs approx. 1,730€, the photovoltaic system 7,740€ (5 kWp system) + installation (1,000€ ??) Would be a total of: 10,470€

Roughly calculated: 1% electricity price increase per year

Instantaneous water heater: after 10 years: 7,022.4€
DHW heat pump: after 10 years: 1,275€

After 17 years it would pay off. Whether the DHW heat pump will last that long is another matter. (I know, this is now a simple calculation)

At 5% electricity price increase it would be after 15 years, 10% after 13 years...

Unfortunately, no one can look into the crystal ball...

Would the photovoltaic system be subsidized?

Thanks for your efforts =)

Regards

Steven

Is a purely storage device excluded for a specific reason?