Heat pump: buffer tank, capacity and modulation

What would your recommendation be then?

We have 300l. That works well. However, in hindsight, I would have preferred to use a fresh water station or a corresponding storage tank. This legionella issue is simply annoying and could have been very well controlled with that.

Hello everyone,

I have now received a somewhat well-founded assessment. So:
It is indeed possible to finance both the heat pump and the photovoltaic system through KFW 261.
Depending on the achieved efficiency class, there is a 15-25% subsidy and a loan with 0.24% (!!) interest for the rest. So this is quite exciting.

But:
If the photovoltaic system is financed through a KFW loan, you no longer receive feed-in tariffs. So it makes little sense (as is always demanded in a well-known photovoltaic forum) to "fill the roof to the maximum". Instead, the system should really be designed for a very high self-consumption share.

I am still calculating. The lost feed-in tariff of course hurts, but it is less dramatic than it seems at first glance. The ROI shifts from 11-12 years by about 2 years to 13-14 years. Still significantly better than a photovoltaic system financed with own funds, which you hardly get under a 20-year ROI.

Best regards,

Andreas

Or do as much as possible and market directly? I read somewhere, from 30kwp there are partners with whom you can then make direct supply contracts.

Hi,

direct marketing?
I read somewhere that from 30 kWp there are partners with whom you can then make direct supply contracts.

Interesting idea. So far, I have only read that you are not allowed to take the feed-in tariff. There was nothing about direct marketing. It would still need to be clarified whether it is allowed; after all, it is also a form of feed-in tariff, isn’t it? But I simply cannot get 30 kWp together; on the house roof I can get a maximum of 16-17 kWp, on the carport maybe another 5-6. Then that’s the end.

Best regards,

Andreas

Feed-in tariff is a subsidy. Because it guarantees you a fixed price per kilowatt-hour, and that for 20 years. Direct marketing is a completely normal business transaction. I produce electricity, you buy it from me. Conditions are freely negotiable (although for very small suppliers, which you usually are as a single-family house user, you are dependent on the direct buyer partners). Check out EnbW, there is information about it, apparently even from 15 kWp...

Hi,
just a little status update:
The tip about direct marketing was great, thanks!
but: The thing looks very good in theory, but now seems to fail in reality. We would need about €55k minus repayment subsidy = €43-45k KFW loan for the planned measures. But the banks do not do that. My house bank clearly says they don’t give KFW loans under €75k, and even brokers like Dr. Klein pass. They told me that most banks want to grant €50k first at their own terms before they issue KFW loans.

Hmm.... difficult. Does anyone know a bank that passes on the KFW conditions cleanly?

Best regards,

Andreas