ᐅ New heating system with domestic hot water production?!

Nissandriver schrieb:

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

“High” is relative. If the tankless water heater (24 kW is fine) is located close to the point of use and the heating system isn’t being changed anyway, I wouldn’t make any changes. Of course, it also depends on the number of users and their usage habits. Five people using the bathtub three times a week is “expensive.”

But you also have to cover the cost of replacing the tankless water heater with another type of water heater ==> see note #12

The probably most cost-effective option would be to add a storage tank to the heating system. This is generally quite easy and affordable. But if it’s just one or two people at most, I would simply keep the tankless water heater. That way, you always have hygienically clean hot water.

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

Nissandriver schrieb:

Where can I find a professional to calculate this?!

Not a professional, but free of charge:

Instant water heater:
600 kWh/year * €0.28/kWh = €168/year per person

Gas:
600 kWh * €0.06/kWh / 50% efficiency = €72

Air-to-water heat pump (AWHP):
600 kWh / SPF3 including losses * €0.28/kWh = €56
With photovoltaic: 200 kWh * 25% * €0.28/kWh + 75% * €0.10/kWh lost feed-in revenue = €29

With 4 people, you save a maximum of about €550 per year. Of course, this depends on consumption and is not guaranteed to be accurate, but it provides a rough reference. Various factors affect efficiency and seasonal performance factor, such as storage losses.

boxandroof schrieb:

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

Good morning,

When I calculated it, I was thinking of something else (what pays off, etc.) — oops, I must have misunderstood.

Okay, this is the current situation. But what if electricity prices rise?

For example, the Buderus domestic hot water heat pump Logatherm WPT 250 I costs about €1,730, the photovoltaic system costs €7,740 (5 kWp system) plus installation (€1,000 ??). The total would be €10,470.

Rough calculation: 1% annual electricity price increase

Instantaneous water heater: after 10 years: €7,022.40
Domestic hot water heat pump: after 10 years: €1,275

It would pay off after 17 years. Whether the heat pump lasts that long is another question. (I know, this is a simplified calculation.)

With 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 =)

Best regards

Steven

Is a pure storage system excluded for a specific reason?